Journal articles
2012
F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , P Belov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , H Jung , M Kapichine , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , R Kogler , P Kostka , M Kraemer , J Kretzschmar , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M Mudrinic , K Muller , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , K Nowak , J E Olsson , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , T Sykora , P D Thompson , T H Tran , D Traynor , P Truoel , I Tsakov , B Tseepeldorj , J Turnau , A Valkarova , C Vallee , P Mechelen , Y Vazdik , D Wegener , E Wuensch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2012) Measurement of dijet production in diffractive deep-inelastic scattering with a leading proton at HERA EUROPEAN PHYSICAL JOURNAL C 72: 4. APR Abstract: The cross section of diffractive deep-inelastic scattering ep -> eXp is measured, where the system X contains at least two jets and the leading final state proton is detected in the H1 Forward Proton Spectrometer. The measurement is performed for fractional proton longitudinal momentum loss x(P) < 0.1 and covers the range 0.1 < vertical bar t vertical bar < 0.7 GeV2 in squared four-momentum transfer at the proton vertex and 4 < Q(2) < 110 GeV2 in photon virtuality. The differential cross sections extrapolated to vertical bar t vertical bar < 1 GeV2 are in agreement with next-to-leading order QCD predictions based on diffractive parton distribution functions extracted from measurements of inclusive and dijet cross sections in diffractive deep-inelastic scattering. The data are also compared with leading order Monte Carlo models.
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F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , P Belov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , H Jung , M Kapichine , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , R Kogler , P Kostka , M Kraemer , J Kretzschmar , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M Mudrinic , K Muller , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , K Nowak , J E Olsson , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , T Sykora , P D Thompson , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2012) Measurement of the azimuthal correlation between the most forward jet and the scattered positron in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 72: 3. MAR Abstract: Deep-inelastic positron-proton scattering events at low photon virtuality, Q(2), with a forward jet, produced at small angles with respect to the proton beam, are measured with the H1 detector at HERA. A subsample of events with an additional jet in the central region is also studied. For both samples, differential cross sections and normalised distributions are measured as a function of the azimuthal angle difference, Delta phi, between the forward jet and the scattered positron in bins of the rapidity distance, Y, between them. The data are compared to predictions of Monte Carlo generators based on different evolution approaches as well as to next-to-leading order calculations in order to test the sensitivity to QCD evolution mechanisms.
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F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , P Belov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , A Bylinkin , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , G Grindhammer , S Habib , D Haidt , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , J Hladky , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , H Jung , M Kapichine , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , R Kogler , P Kostka , M Kramer , J Kretzschmar , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , B Lobodzinski , R Lopez-Fernandez , V Lubimov , E Malinovski , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , K Muller , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , K Nowak , J E Olsson , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , T Sykora , P D Thompson , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , R Zlebcik , H Zohrabyan , F Zomer (2012) Inclusive measurement of diffractive deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 72: 7. JUL Abstract: The diffractive process ep -> eXY, where Y denotes a proton or its low mass excitation with M-Y < 1.6 GeV, is studied with the H1 experiment at HERA. The analysis is restricted to the phase space region of the photon virtuality 3 <= Q(2) <= 1600 GeV2, the square of the fourmomentum transfer at the proton vertex vertical bar t vertical bar < 1.0 GeV2 and the longitudinal momentum fraction of the incident proton carried by the colourless exchange x(P) < 0.05. Triple differential cross sections are measured as a function of x(P), Q(2) and beta = x/x(P) where x is the Bjorken scaling variable. These measurements are made after selecting diffractive events by demanding a large empty rapidity interval separating the final state hadronic systems X and Y. High statistics measurements covering the data taking periods 1999-2000 and 2004-2007 are combined with previously published results in order to provide a single set of diffractive cross sections from the H1 experiment using the large rapidity gap selection method. The combined data represent a factor between three and thirty increase in statistics with respect to the previously published results. The measurements are compared with predictions from NLO QCD calculations based on diffractive parton densities and from a dipole model. The proton vertex factorisation hypothesis is tested.
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F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , P Belov , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , R Kogler , P Kostka , M Kraemer , J Kretzschmar , K Krueger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M Mudrinic , K Mueller , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , K Nowak , J E Olsson , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , T Sykora , P D Thompson , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2012) Measurement of inclusive and dijet D* meson cross sections in photoproduction at HERA EUROPEAN PHYSICAL JOURNAL C 72: 5. MAY Abstract: The inclusive photoproduction of D* mesons and of D*-tagged dijets is investigated with the H1 detector at the ep collider HERA. The kinematic region covers small photon virtualities Q(2) < 2 GeV2 and photon-proton centre-of-mass energies of 100< W-gamma p < 285 GeV. Inclusive D* meson differential cross sections are measured for central rapidities vertical bar eta(D*)vertical bar < 1.5 and transverse momenta p(T) (D*) > 1.8 GeV. The heavy quark production process is further investigated in events with at least two jets with transverse momentum p(T) (jet) > 3.5 GeV each, one containing the D* meson. Differential cross sections for D*-tagged dijet production and for correlations between the jets are measured in the range vertical bar eta(D*)vertical bar < 1.5 and p(T) (D*) > 2.1 GeV. The results are compared with predictions from Monte Carlo simulations and next-to-leading order perturbative QCD calculations.
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F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , P Belov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , A Bylinkin , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , G Grindhammer , S Habib , D Haidt , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , H Jung , M Kapichine , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , R Kogler , P Kostka , M Kramer , J Kretzschmar , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , B Lobodzinski , R Lopez-Fernandez , V Lubimov , E Malinovski , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , K Muller , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , K Nowak , J E Olsson , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , T Sykora , D Thompson , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , R Zlebcik , H Zohrabyan , F Zomer (2012) Determination of the integrated luminosity at HERA using elastic QED Compton events EUROPEAN PHYSICAL JOURNAL C 72: 10. OCT Abstract: A measurement of the integrated luminosity at the ep collider HERA is presented, exploiting the elastic QED Compton process ep -> e gamma p. The electron and the photon are detected in the backward calorimeter of the H1 experiment. The integrated luminosity of the data recorded in 2003 to 2007 is determined with a precision of 2.3%. The measurement is found to be compatible with the corresponding result obtained using the Bethe-Heitler process.
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F D Aaron , H Abramowicz , I Abt , L Adamczyk , M Adamus , R Aggarwal , C Alexa , V Andreev , S Antonelli , P Antonioli , A Antonov , M Arneodo , O Arslan , V Aushev , Y Aushev , O Bachynska , S Backovic , A Baghdasaryan , S Baghdasaryan , A Bamberger , A N Barakbaev , G Barbagli , G Bari , F Barreiro , E Barrelet , W Bartel , N Bartosik , D Bartsch , M Basile , K Begzsuren , O Behnke , J Behr , U Behrens , L Bellagamba , A Belousov , P Belov , A Bertolin , S Bhadra , M Bindi , J C Bizot , C Blohm , V Bokhonov , K Bondarenko , E G Boos , K Borras , D Boscherini , D Bot , V Boudry , I Bozovic-Jelisavcic , T Bold , N Brummer , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , I Brock , E Brownson , R Brugnera , D Bruncko , A Bruni , G Bruni , B Brzozowska , A Bunyatyan , P J Bussey , A Bylinkin , B Bylsma , L Bystritskaya , A Caldwell , A J Campbell , K B C Avila , M Capua , R Carlin , C D Catterall , F Ceccopieri , K Cerny , V Cerny , S Chekanov , V Chekelian , J Chwastowski , J Ciborowski , R Ciesielski , L Cifarelli , F Cindolo , A Contin , J G Contreras , A M Cooper-Sarkar , N Coppola , M Corradi , F Corriveau , M Costa , J A Coughlan , J Cvach , G D'Agostini , J B Dainton , F Dal Corso , K Daum , B Delcourt , J Delvax , R K Dementiev , M Derrick , R C E Devenish , S De Pasquale , E A De Wolf , J del Peso , C Diaconu , M Dobre , D Dobur , V Dodonov , B A Dolgoshein , G Dolinska , A Dossanov , A T Doyle , V Drugakov , A Dubak , L S Durkin , S Dusini , G Eckerlin , S Egli , Y Eisenberg , A Eliseev , E Elsen , P F Ermolov , A Eskreys , S Fang , L Favart , S Fazio , A Fedotov , R Felst , J Feltesse , J Ferencei , J Ferrando , M I Ferrero , J Figiel , D J Fischer , M Fleischer , A Fomenko , M Forrest , B Foster , E Gabathuler , G Gach , A Galas , E Gallo , A Garfagnini , J Gayler , A Geiser , S Ghazaryan , I Gialas , A Gizhko , L K Gladilin , D Gladkov , C Glasman , A Glazov , L Goerlich , N Gogitidze , O Gogota , Y A Golubkov , P Gottlicher , M Gouzevitch , C Grab , I Grabowska-Bold , A Grebenyuk , J Grebenyuk , T Greenshaw , I Gregor , G Grigorescu , G Grindhammer , G Grzelak , O Gueta , M Guzik , C Gwenlan , A Huttmann , T Haas , S Habib , D Haidt , W Hain , R Hamatsu , J C Hart , H Hartmann , G Hartner , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , E Hilger , K H Hiller , J Hladky , D Hochman , D Hoffmann , R Hori , R Horisberger , T Hreus , F Huber , Z A Ibrahim , Y Iga , R Ingbir , M Ishitsuka , M Jacquet , H P Jakob , X Janssen , F Januschek , T W Jones , L Jonsson , M Jungst , H Jung , I Kadenko , B Kahle , S Kananov , T Kanno , M Kapichine , U Karshon , F Karstens , I I Katkov , P Kaur , M Kaur , I R Kenyon , A Keramidas , L A Khein , C Kiesling , J Y Kim , D Kisielewska , S Kitamura , R Klanner , M Klein , U Klein , C Kleinwort , E Koffeman , R Kogler , N Kondrashova , O Kononenko , P Kooijman , I Korol , I A Korzhavina , P Kostka , A Kotanski , U Kotz , H Kowalski , M Kramer , J Kretzschmar , K Kruger , O Kuprash , M Kuze , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , A Lee , V Lendermann , B B Levchenko , S Levonian , A Levy , V Libov , S Limentani , T Y Ling , K Lipka , M Lisovyi , B List , J List , E Lobodzinska , B Lobodzinski , W Lohmann , B Lohr , E Lohrmann , K R Long , A Longhin , D Lontkovskyi , R Lopez-Fernandez , V Lubimov , O Y Lukina , J Maeda , S Magill , I Makarenko , E Malinovski , J Malka , R Mankel , A Margotti , G Marini , J F Martin , H U Martyn , A Mastroberardino , M C K Mattingly , S J Maxfield , A Mehta , I A Melzer-Pellmann , S Mergelmeyer , A B Meyer , H Meyer , J Meyer , S Miglioranzi , S Mikocki , I Milcewicz-Mika , F M Idris , V Monaco , A Montanari , F Moreau , A Morozov , J V Morris , J D Morris , K Mujkic , K Muller , B Musgrave , K Nagano , T Namsoo , R Nania , T Naumann , P R Newman , C Niebuhr , A Nigro , D Nikitin , Y Ning , T Nobe , D Notz , G Nowak , K Nowak , R J Nowak , A E Nuncio-Quiroz , B Y Oh , N Okazaki , K Olkiewicz , J E Olsson , Y Onishchuk , D Ozerov , P Pahl , V Palichik , M Pandurovic , K Papageorgiu , A Parenti , C Pascaud , G D Patel , E Paul , J M Pawlak , B Pawlik , P G Pelfer , A Pellegrino , E Perez , W Perlanski , H Perrey , A Petrukhin , I Picuric , K Piotrzkowski , H Pirumov , D Pitzl , R Placakyte , P Plucinski , B Pokorny , N S Pokrovskiy , R Polifka , A Polini , B Povh , A S Proskuryakov , M Przybycien , V Radescu , N Raicevic , A Raval , T Ravdandorj , D D Reeder , P Reimer , B Reisert , Z Ren , J Repond , Y D Ri , E Rizvi , A Robertson , P Robmann , P Roloff , R Roosen , A Rostovtsev , M Rotaru , I Rubinsky , J E R Tabasco , S Rusakov , M Ruspa , R Sacchi , D Salek , U Samson , D P C Sankey , G Sartorelli , M Sauter , E Sauvan , A A Savin , D H Saxon , M Schioppa , S Schlenstedt , P Schleper , W B Schmidke , S Schmitt , U Schneekloth , L Schoeffel , V Schonberg , A Schoning , T Schorner-Sadenius , H C Schultz-Coulon , J Schwartz , F Sciulli , F Sefkow , L M Shcheglova , R Shehzadi , S Shimizu , L N Shtarkov , S Shushkevich , I Singh , I O Skillicorn , W Slominski , T Sloan , W H Smith , V Sola , A Solano , Y Soloviev , D Son , P Sopicki , V Sosnovtsev , D South , V Spaskov , A Specka , A Spiridonov , H Stadie , L Stanco , Z Staykova , M Steder , N Stefaniuk , B Stella , A Stern , T P Stewart , A Stifutkin , G Stoicea , P Stopa , U Straumann , S Suchkov , G Susinno , L Suszycki , T Sykora , J Sztuk-Dambietz , J Szuba , D Szuba , A D Tapper , E Tassi , J Terron , T Theedt , P D Thompson , H Tiecke , K Tokushuku , J Tomaszewska , T H Tran , D Traynor , P Truol , V Trusov , I Tsakov , B Tseepeldorj , T Tsurugai , M Turcato , O Turkot , J Turnau , T Tymieniecka , M Vazquez , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , A Verbytskyi , O Viazlo , N N Vlasov , R Walczak , W A T W Abdullah , D Wegener , J J Whitmore , K Wichmann , L Wiggers , M Wing , M Wlasenko , G Wolf , H Wolfe , K Wrona , E Wunsch , A G Yagues-Molina , S Yamada , Y Yamazaki , R Yoshida , C Youngman , O Zabiegalov , J Zacek , J Zalesak , L Zawiejski , O Zenaiev , W Zeuner , Z Zhang , B O Zhautykov , N Zhmak , A Zhokin , A Zichichi , R Zlebcik , H Zohrabyan , Z Zolkapli , F Zomer , D S Zotkin , A F Zarnecki (2012) Combined inclusive diffractive cross sections measured with forward proton spectrometers in deep inelastic ep scattering at HERA EUROPEAN PHYSICAL JOURNAL C 72: 10. OCT Abstract: A combination of the inclusive diffractive cross section measurements made by the H1 and ZEUS Collaborations at HERA is presented. The analysis uses samples of diffractive deep inelastic ep scattering data at a centre-of-mass energy root s = 318 GeV where leading protons are detected by dedicated spectrometers. Correlations of systematic uncertainties are taken into account, resulting in an improved precision of the cross section measurement which reaches 6 % for the most precise points. The combined data cover the range 2.5 < Q(2) < 200 GeV2 in photon virtuality, 0.00035 < x(P) < 0.09 in proton fractional momentum loss, 0.09 < vertical bar t vertical bar < 0.55 GeV2 in squared four-momentum transfer at the proton vertex and 0.0018 < beta < 0.816 in beta = x/x(P), where x is the Bjorken scaling variable.
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F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , P Belov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , A Bylinkin , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A DeWolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , G Grindhammer , S Habib , D Haidt , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , I R Kenyon , C Kiesling , M Klein , C Kleinwort , R Kogler , P Kostka , M Kramer , J Kretzschmar , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , B Lobodzinski , R Lopez-Fernandez , V Lubimov , E Malinovski , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , K Muller , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , K Nowak , B Olivier , J E Olsson , D Ozerov , P Pahl , V Palichik , M Pandurovic , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , T Sykora , P D Thompson , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , R Zlebcik , H Zohrabyan , F Zomer (2012) Measurement of beauty photoproduction near threshold using di-electron events with the H1 detector at HERA EUROPEAN PHYSICAL JOURNAL C 72: 10. OCT Abstract: The cross section for ep -> eb (b) over barX in photoproduction is measured with the H1 detector at the ep-collider HERA. The decay channel b (b) over bar -> eeX' is selected by identifying the semi-electronic decays of the b-quarks. The total production cross section is measured in the kinematic range given by the photon virtuality Q(2) <= 1 GeV2, the inelasticity 0.05 <= y <= 0.65 and the pseudorapidity of the b-quarks vertical bar eta(b)vertical bar, vertical bar eta((b) over bar)vertical bar <= 2. The differential production cross section is measured as a function of the average transverse momentum of the beauty quarks < P-T(b)> down to the threshold. The results are compared to next-to-leading-order QCD predictions.
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2011
F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , P Belov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Eisen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , H Jung , M Kapichine , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , R Kogler , P Kostka , M Kraemer , J Kretzschmar , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , R Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , E Moreau , A Morozov , J V Morris , M Mudrinic , K Muller , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , K Nowak , J E Olsson , S Osman , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , R Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , E Sefkow , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , T Sykora , P D Thompson , T Toll , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , M V von den Driesch , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , E Zomer (2011) Search for lepton flavour violation at HERA PHYSICS LETTERS B 701: 1. 20-30 JUN 27 Abstract: A search for second and third generation scalar and vector leptoquarks produced in ep collisions via the lepton flavour violating processes ep -> mu X and ep -> tau X is performed by the H1 experiment at HERA. The full data sample taken at a centre-of-mass energy root s = 319 GeV is used for the analysis, corresponding to an integrated luminosity of 245 pb(-1) of e(+)p and 166 pb(-1) of e(-)p collision data. No evidence for the production of such leptoquarks is observed in the H1 data. Leptoquarks produced in e(+/-)p collisions with a coupling strength of lambda = 0.3 and decaying with the same coupling strength to a muon-quark pair or a tau-quark pair are excluded at 95% confidence level up to leptoquark masses of 712 GeV and 479 GeV, respectively. (C) 2011 Elsevier B.V. All rights reserved.
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F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryan , E Barrelet , W Bartel , O Behrend , P Belov , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , G Buschhorn , A Bylinkin , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , P Kostka , M Kraemer , J Kretzschmar , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , K Nowak , J E Olsson , S Osman , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , T Sykora , P D Thompson , T Toll , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , I Tsurin , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A Vargas , Y Vazdik , M von den Driesch , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2011) Measurement of the inclusive e(+/-) p scattering cross section at high inelasticity y and of the structure function F-L EUROPEAN PHYSICAL JOURNAL C 71: 3. MAR Abstract: A measurement is presented of the inclusive neutral current e(+/-) p scattering cross section using data collected by the H1 experiment at HERA during the years 2003 to 2007 with proton beam energies E-p of 920, 575, and 460 GeV. The kinematic range of the measurement covers low absolute four-momentum transfers squared, 1.5 GeV2 < Q(2) < 120 GeV2, small values of Bjorken x, 2.9 . 10(-5) < x < 0.01, and extends to high inelasticity up to y = 0.85. The structure function F-L is measured by combining the new results with previously published H1 data at E-p = 920 GeV and E-p = 820 GeV. The new measurements are used to test several phenomenological and QCD models applicable in this low Q(2) and low x kinematic domain.
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F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , M Deak , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , P Kostka , M Kraemer , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , K Nowak , J E Olsson , S Osman , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , G Thompson , P D Thompson , T Toll , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , M von den Driesch , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2011) Measurement of the cross section for diffractive deep-inelastic scattering with a leading proton at HERA EUROPEAN PHYSICAL JOURNAL C 71: 3. MAR Abstract: The cross section for the diffractive deep-inelastic scattering process ep -> eXp is measured, with the leading final state proton detected in the H1 Forward Proton Spectrometer. The data sample covers the range x(P) < 0.1 in fractional proton longitudinal momentum loss, 0.1 < vertical bar t vertical bar < 0.7 GeV(2) in squared four-momentum transfer at the proton vertex and 4 < Q(2) < 700 GeV(2) in photon virtuality. The cross section is measured four-fold differentially in t, x(P), Q2 and beta = x/x(P), where x is the Bjorken scaling variable. The t and x(P) dependences are interpreted in terms of an effective pomeron trajectory and a sub-leading exchange. The data are compared with perturbative QCD predictions at next-to-leading order based on diffractive parton distribution functions previously extracted from complementary measurements of inclusive diffractive deep-inelastic scattering. The ratio of the diffractive to the inclusive ep cross section is studied as a function of Q(2), beta and x(P).
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F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A DeWolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , P Kostka , M Kraemer , J Kretzschmar , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , K Nowak , J E Olsson , S Osman , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , G Thompson , P D Thompson , T Toll , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , M von den Driesch , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2011) Search for squarks in R-parity violating supersymmetry in ep collisions at HERA EUROPEAN PHYSICAL JOURNAL C 71: 3. MAR Abstract: A search for squarks in R-parity violating super-symmetry is performed in e(+/-)p collisions at HERA using the H1 detector. The full data sample taken at a centre-of-mass energy root s = 319 GeV is used for the analysis, corresponding to an integrated luminosity of 255 pb(-1) of e(+)p and 183 pb(-1) of e(-)p collision data. The resonant production of squarks via a Yukawa coupling. lambda' is considered, taking into account direct and indirect R-parity violating decay modes. Final states with jets and leptons are investigated. No evidence for squark production is found and mass dependent limits on lambda' are obtained in the framework of the Minimal Supersymmetric Standard Model and in the Minimal Super-gravity Model. In the considered part of the parameter space, for a Yukawa coupling of electromagnetic strength lambda' = 0.3, squarks of all flavours are excluded up to masses of 275 GeV at 95% confidence level, with down-type squarks further excluded up to masses of 290 GeV.
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F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , P Belov , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , R Kogler , P Kostka , M Kraemer , J Kretzschmar , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M Mudrinic , K Muller , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , K Nowak , J E Olsson , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , T Sykora , P D Thompson , T Toll , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2011) Measurement of D*(+/-) meson production and determination of F-2(c(c)over-bar) at low Q(2) in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 71: 10. OCT Abstract: Inclusive production of D* mesons in deep-inelastic ep scattering at HERA is studied in the range 5 < Q(2) < 100 GeV2 of the photon virtuality and 0.02 < y < 0.7 of the inelasticity of the scattering process. The observed phase space for the D* meson is (pT) (D*) > 1.25 GeV and |eta( D*)| < 1.8. The data sample corresponds to an integrated luminosity of 348 pb(-1) collected with the H1 detector. Single and double differential cross sections are measured and the charm contribution F-2(c (c) over bar) to the proton structure function F-2 is determined. The results are compared to perturbative QCD predictions at next-to-leading order implementing different schemes for the charm mass treatment and with Monte Carlo models based on leading order matrix elements with parton showers.
Notes:
F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , M Deak , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , P Kostka , M Kraemer , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , K Nowak , J E Olsson , S Osman , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , A J Rahmat , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , G Thompson , P D Thompson , T Toll , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , M von den Driesch , D Wegener , E Wuensch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2011) Measurement of charm and beauty jets in deep inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 71: 1. JAN Abstract: Measurements of cross sections for events with charm and beauty jets in deep inelastic scattering at HERA are presented. Events with jets of transverse energy E-T(jet) > 6 GeV and pseudorapidity - 1.0 < eta(jet) < 1.5 in the laboratory frame are selected in the kinematic region of photon virtuality Q(2) > 6 GeV2 and inelasticity variable 0.07 < y < 0.625. Measurements are also made requiring a jet in the Breit frame with E-T(*jet) > 6 GeV. The data were collected with the H1 detector in the years 2006 and 2007 corresponding to an integrated luminosity of 189 pb(-1). The numbers of charm and beauty jets are determined using variables reconstructed using the H1 vertex detector with which the impact parameters of the tracks to the primary vertex and the position of secondary vertices are measured. The measurements are compared with QCD predictions and with previous measurements where heavy flavours are identified using muons.
Notes:
F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , P Belov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , H Jung , M Kapichine , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , R Kogler , P Kostka , M Kraemer , J Kretzschmar , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , R Lopez-Fernandez , V Lubimov , L Lytkin , A Makankine , E Malinovski , P Marage , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M Mudrinic , K Muller , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , K Nowak , J E Olsson , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , T Sykora , P D Thompson , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2011) Measurement of photon production in the very forward direction in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 71: 10. OCT Abstract: The production of photons at very small angles with respect to the proton beam direction is studied in deep-inelastic positron-proton scattering at HERA. The data are taken with the H1 detector in the years 2006 and 2007 and correspond to an integrated luminosity of 126 pb(-1). The analysis covers the range of negative four momentum transfer squared at the positron vertex 6 < Q(2) < 100 GeV(2) and inelasticity 0.05 < y < 0.6. Cross sections are measured for the most energetic photon with pseudorapidity eta > 7.9 as a function of its transverse momentum p(T)(lead) and longitudinal momentum fraction of the incoming proton x(L)(lead). In addition, the cross sections are studied as a function of the sum of the longitudinal momentum fraction x(L)(sum) L of all photons in the pseudorapidity range. > 7.9. The cross sections are normalised to the inclusive deep-inelastic scattering cross section and compared to the predictions of models of deep-inelastic scattering and models of the hadronic interactions of high energy cosmic rays.
Notes:
F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , P Belov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A DeWolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , H Jung , M Kapichine , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , R Kogler , P Kostka , M Kramer , J Kretzschmar , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M Mudrinic , K Mueller , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , K Nowak , J E Olsson , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , T Sykora , P D Thompson , T Toll , T H Tran , D Traynor , P Truoel , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , D Wegener , E Wuensch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2011) Measurement of the diffractive longitudinal structure function F-L(D) at HERA EUROPEAN PHYSICAL JOURNAL C 71: 12. DEC Abstract: First measurements are presented of the diffractive cross section sigma(ep) -> eXY at centre-of-mass energies root s of 225 and 252 GeV, together with a precise new measurement at root s of 319 GeV, using data taken with the H1 detector in the years 2006 and 2007. Together with previous H1 data at root s of 301 GeV, the measurements are used to extract the diffractive longitudinal structure function F-L(D) in the range of photon virtualities 4.0 <= Q(2) <= 44.0 GeV2 and fractional proton longitudinal momentum loss 5 x 10(-4) <= x(P) <= 3 x 10(-3). The measured F-L(D) is compared with leading twist predictions based on diffractive parton densities extracted in NLO QCD fits to previous measurements of diffractive Deep-Inelastic Scattering and with a model which additionally includes a higher twist contribution derived from a colour dipole approach. The ratio of the diffractive cross section induced by longitudinally polarised photons to that for transversely polarised photons is extracted and compared with the analogous quantity for inclusive Deep-Inelastic Scattering.
Notes:
F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , P Belov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , H Jung , M Kapichine , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , R Kogler , P Kostka , M Kraemer , J Kretzschmar , K Krueger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M Mudrinic , K Muller , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , K Nowak , J E Olsson , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , T Sykora , P D Thompson , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2011) Search for contact interactions in e(+/-)p collisions at HERA H1 Collaboration PHYSICS LETTERS B 705: 1-2. 52-58 NOV 3 Abstract: A search for physics beyond the Standard Model in neutral current deep inelastic scattering at high negative four-momentum transfer squared Q(2) is performed in e(+/-)p collisions at HERA. The differential cross section d sigma/dQ(2), measured using the full H1 data sample corresponding to an integrated luminosity of 446 pb(-1), is compared to the Standard Model prediction. No significant deviation is observed. Limits on various models predicting new phenomena at high Q(2) are derived. For general four-fermion eeqq contact interaction models, lower limits on the compositeness scale A are set in the range 3.6 TeV to 7.2 TeV. Leptoquarks with masses M-LQ and couplings lambda are constrained to M-LQ/lambda > 0.41-1.86 TeV and limits on squarks in R-parity violating supersymmetric models are derived. A lower limit on the gravitational scale in 4 + n dimensions of M-S > 0.9 TeV is established for low-scale quantum gravity effects in models with large extra dimensions. For the light quark radius an upper bound of R-q < 0.65 . 10(-18) m is determined. (C) 2011 Elsevier B.V. All rights reserved.
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F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , S Baghdasaryana , E Barrelet , W Bartel , K Begzsuren , A Belousov , P Belov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Britzger , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Ceccopieri , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , S Egli , A Eliseev , E Elsen , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrantk , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , H Jung , M Kapichine , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , R Kogler , P Kostka , M Kraemer , J Kretzschmar , K Kruger , M P J Landon , W Lange , G Lastovitka-Medin , R Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M Mudrinic , K Muller , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , K Nowak , J E Olsson , D Ozerov , R Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Platakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , T Ravdandorj , P Reimer , E Rizvi , R Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , T Sykora , R Thompson , T H Tran , D Traynor , R Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , R Van Mechelen , Y Vazdik , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2011) Search for first generation leptoquarks in ep collisions at HERA PHYSICS LETTERS B 704: 5. 388-396 OCT 25 Abstract: A search for first generation scalar and vector leptoquarks produced in ep collisions is performed by the H1 experiment at HERA. The full H1 data sample is used in the analysis, corresponding to an integrated luminosity of 446 pb(-1). No evidence for the production of leptoquarks is observed in final states with a large transverse momentum electron or with large missing transverse momentum, and constraints on leptoquark models are derived. For leptoquark couplings of electromagnetic strength lambda = 0.3, first generation leptoquarks with masses up to 800 GeV are excluded at 95% confidence level. (C) 2011 Elsevier B.V. All rights reserved.
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2010
F D Aaron , H Abramowicz , I Abt , L Adamczyk , M Adamus , M A Martin , C Alexa , V Andreev , S Antonelli , P Antonioli , A Antonov , B Antunovic , M Arneodo , V Aushev , O Bachynska , S Backovic , A Baghdasaryan , A Bamberger , A N Barakbaev , G Barbagli , G Bari , F Barreiro , E Barrelet , W Bartel , D Bartsch , M Basile , K Begzsuren , O Behnke , J Behr , U Behrens , L Bellagamba , A Belousov , A Bertolin , S Bhadra , M Bindi , J C Bizot , C Blohm , T Bold , E G Boos , M Borodin , K Borras , D Boscherini , D Bot , V Boudry , S K Boutle , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , I Brock , E Brownson , R Brugnera , N Brummer , D Bruncko , A Bruni , G Bruni , B Brzozowska , A Bunyatyan , G Buschhorn , P J Bussey , J M Butterworth , B Bylsma , L Bystritskaya , A Caldwell , A J Campbell , K B C Avila , M Capua , R Carlin , C D Catterall , K Cerny , V Cerny , S Chekanov , V Chekelian , A Cholewa , J Chwastowski , J Ciborowski , R Ciesielski , F Cindolo , A Contin , J G Contreras , A M Cooper-Sarkar , N Coppola , M Corradi , F Corriveau , M Costa , J A Coughlan , G Cozzika , J Cvach , G D'Agostini , J B Dainton , F Dal Corso , K Daum , M Deak , J de Favereau , B Delcourt , M Del Degan , J del Peso , J Delvax , R K Dementiev , S De Pasquale , M Derrick , R C E Devenish , E A De Wolf , C Diaconu , D Dobur , V Dodonov , B A Dolgoshein , A Dossanov , A T Doyle , V Drugakov , A Dubak , L S Durkin , S Dusini , G Eckerlin , V Efremenko , S Egli , Y Eisenberg , A Eliseev , E Elsen , P F Ermolov , A Eskreys , A Falkiewicz , S Fang , L Favart , S Fazio , A Fedotov , R Felst , J Feltesse , J Ferencei , J Ferrando , M I Ferrero , J Figiel , D J Fischer , M Fleischer , A Fomenko , M Forrest , B Foster , S Fourletov , E Gabathuler , A Galas , E Gallo , A Garfagnini , J Gayler , A Geiser , S Ghazaryan , I Gialas , L K Gladilin , D Gladkov , C Glasman , A Glazov , I Glushkov , L Goerlich , N Gogitidze , Y A Golubkov , P Gottlicher , M Gouzevitch , C Grab , I Grabowska-Bold , J Grebenyuk , T Greenshaw , I Gregor , B R Grell , G Grigorescu , G Grindhammer , G Grzelak , C Gwenlan , T Haas , S Habib , D Haidt , W Hain , R Hamatsu , J C Hart , H Hartmann , G Hartner , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , E Hilger , K H Hiller , D Hochman , D Hoffmann , U Holm , R Hori , R Horisberger , K Horton , T Hreus , A Huttmann , G Iacobucci , Z A Ibrahim , Y Iga , R Ingbir , M Ishitsuka , M Jacquet , H P Jakob , X Janssen , F Januschek , M Jimenez , T W Jones , L Jonsson , A W Jung , H Jung , M Jungst , I Kadenko , B Kahle , B Kamaluddin , S Kananov , T Kanno , M Kapichine , U Karshon , F Karstens , I I Katkov , J Katzy , M Kaur , P Kaur , I R Kenyon , A Keramidas , L A Khein , C Kiesling , J Y Kim , D Kisielewska , S Kitamura , R Klanner , M Klein , U Klein , C Kleinwort , T Kluge , A Knutsson , E Koffeman , R Kogler , D Kollar , P Kooijman , I Korol , I A Korzhavina , P Kostka , A Kotanski , U Kotz , H Kowalski , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Krueger , P Kulinski , O Kuprash , K Kutak , M Kuze , V A Kuzmin , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , A Lee , G Leibenguth , V Lendermann , B B Levchenko , S Levonian , A Levy , G Li , V Libov , S Limentani , T Y Ling , K Lipka , A Liptaj , M Lisovyi , B List , J List , E Lobodzinska , W Lohmann , B Lohr , E Lohrmann , J H Loizides , N Loktionova , K R Long , A Longhin , D Lontkovskyi , R Lopez-Fernandez , V Lubimov , J Lukasik , O Y Lukina , P Luzniak , J Maeda , S Magill , A Makankine , I Makarenko , E Malinovski , J Malka , R Mankel , P Marage , A Margotti , G Marini , L Marti , J F Martin , H U Martyn , A Mastroberardino , T Matsumoto , M C K Mattingly , S J Maxfield , A Mehta , I A Melzer-Pellmann , A B Meyer , H Meyer , J Meyer , S Miglioranzi , S Mikocki , I Milcewicz-Mika , F M Idris , V Monaco , A Montanari , F Moreau , A Morozov , J D Morris , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , B Musgrave , K Nagano , T Namsoo , R Nania , T Naumann , P R Newman , D Nicholass , C Niebuhr , A Nigro , A Nikiforov , D Nikitin , Y Ning , U Noor , D Notz , G Nowak , K Nowak , R J Nowak , M Nozicka , A E Nuncio-Quiroz , B Y Oh , N Okazaki , K Oliver , B Olivier , K Olkiewicz , J E Olsson , Y Onishchuk , S Osman , O Ota , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , K Papageorgiu , A Parenti , C Pascaud , G D Patel , E Paul , J M Pawlak , B Pawlik , O Pejchal , P G Pelfer , A Pellegrino , E Perez , W Perlanski , H Perrey , A Petrukhin , I Picuric , S Piec , K Piotrzkowski , D Pitzl , R Placakyte , P Plucinski , B Pokorny , N S Pokrovskiy , R Polifka , A Polini , B Povh , A S Proskuryakov , M Przybycien , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , A Raval , T Ravdandorj , P Reimer , B Reisert , Z Ren , J Repond , Y D Ri , E Rizvi , A Robertson , P Robmann , B Roland , P Roloff , E Ron , R Roosen , A Rostovtsev , M Rotaru , I Rubinsky , J E R Tabasco , Z Rurikova , S Rusakov , M Ruspa , R Sacchi , D Salek , A Salii , U Samson , D P C Sankey , G Sartorelli , M Sauter , E Sauvan , A A Savin , D H Saxon , M Schioppa , S Schlenstedt , P Schleper , W B Schmidke , S Schmitt , U Schneekloth , L Schoeffel , V Schonberg , A Schoning , T Schorner-Sadenius , H C Schultz-Coulon , J Schwartz , F Sciulli , F Sefkow , R N Shaw-West , L M Shcheglova , R Shehzadi , S Shimizu , L N Shtarkov , S Shushkevich , I Singh , I O Skillicorn , T Sloan , W Slominski , I Smiljanic , W H Smith , V Sola , A Solano , Y Soloviev , D Son , P Sopicki , I Sorokin , V Sosnovtsev , D South , V Spaskov , A Specka , A Spiridonov , H Stadie , L Stanco , Z Staykova , M Steder , B Stella , A Stern , T P Stewart , A Stifutkin , G Stoicea , P Stopa , U Straumann , S Suchkov , D Sunar , G Susinno , L Suszycki , T Sykora , J Sztuk , D Szuba , J Szuba , A D Tapper , E Tassi , V Tchoulakov , J Terron , T Theedt , G Thompson , P D Thompson , H Tiecke , K Tokushuku , T Toll , F Tomasz , J Tomaszewska , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , T Tsurugai , M Turcato , J Turnau , T Tymieniecka , K Urban , C Uribe-Estrada , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , M Vazquez , A Verbytskyi , V Viazlo , S Vinokurova , N N Vlasov , V Volchinski , O Volynets , M von den Driesch , R Walczak , W A T W Abdullah , D Wegener , J J Whitmore , J Whyte , L Wiggers , M Wing , C Wissing , M Wlasenko , G Wolf , H Wolfe , K Wrona , E Wusch , A G Yagunes-Molina , S Yamada , Y Yamazaki , R Yoshida , C Youngman , J Zacek , J Zalesak , A F Zarnecki , L Zawiejski , O Zenaiev , W Zeuner , Z Zhang , B O Zhautykov , A Zhokin , C Zhou , A Zichichi , T Zimmermann , H Zohrabyan , M Zolko , F Zomer , D S Zotkin , R Zus (2010) Events with an isolated lepton and missing transverse momentum and measurement of W production at HERA JOURNAL OF HIGH ENERGY PHYSICS 3. MAR Abstract: A search for events containing an isolated electron or muon and missing trans verse momentum produced in e(+/-)p collisions is performed with the H1 and ZEUS detectors at HERA. The data were taken in the period 1994-2007 and correspond to an integrated luminosity of 0.98 fb(-1). The observed event yields are in good overall agreement with the Standard Model prediction, which is dominated by single W production. In the e(+)p data, at large hadronic transverse momentum P(T)(X) > 25GeV, a total of 23 events are observed compared to a prediction of 14.0 +/- 1.9. The total single W boson production cross section is measured as 1.06 +/- 0.16 (stat.) +/- 0.07 (sys.) pb, in agreement with an Standard Model (SM) expectation of 1.26 +/- 0.19 pb.
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F D Aaron , M A Martin , C Alexa , V Andreev , B Antunovic , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer , R Zus (2010) Prompt photons in photoproduction at HERA EUROPEAN PHYSICAL JOURNAL C 66: 1-2. 17-33 MAR Abstract: The production of prompt photons is measured in the photoproduction regime of electron-proton scattering at HERA. The analysis is based on a data sample corresponding to a total integrated luminosity of 340 pb(-1) collected by the H1 experiment. Cross sections are measured for photons with transverse momentum and pseudorapidity in the range 6< E(T)(gamma) < 15 GeV and -1.0< eta(gamma) < 2.4, respectively. Cross sections for events with an additional jet are measured as a function of the transverse energy and pseudorapidity of the jet, and as a function of the fractional momenta x(gamma) and x(p) carried by the partons entering the hard scattering process. The correlation between the photon and the jet is also studied. The results are compared with QCD predictions based on the collinear and on the k(T) factorization approaches.
Notes:
F D Aaron , M A Martin , C Alexa , K Alimujiang , V Andreev , B Antunovic , A Asmone , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , M E Janssen , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer , R Zus (2010) Measurement of the charm and beauty structure functions using the H1 vertex detector at HERA EUROPEAN PHYSICAL JOURNAL C 65: 1-2. 89-109 JAN Abstract: Inclusive charm and beauty cross sections are measured in e (-) p and e (+) p neutral current collisions at HERA in the kinematic region of photon virtuality 5a parts per thousand currency signQ (2)a parts per thousand currency sign2000 GeV(2) and Bjorken scaling variable 0.0002a parts per thousand currency signxa parts per thousand currency sign0.05. The data were collected with the H1 detector in the years 2006 and 2007 corresponding to an integrated luminosity of 189 pb(-1). The numbers of charm and beauty events are determined using variables reconstructed by the H1 vertex detector including the impact parameter of tracks to the primary vertex and the position of the secondary vertex. The measurements are combined with previous data and compared to QCD predictions.
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F D Aaron , H Abramowicz , I Abt , L Adamczyk , M Adamus , M Al-daya Martin , C Alexa , V Andreev , S Antonelli , P Antonioli , A Antonov , B Antunovic , M Arneodo , V Aushev , O Bachynska , S Backovic , A Baghdasaryan , A Bamberger , A N Barakbaev , G Barbagli , G Bari , F Barreiro , E Barrelet , W Bartel , D Bartsch , M Basile , K Begzsuren , O Behnke , J Behr , U Behrens , L Bellagamba , A Belousov , A Bertolin , S Bhadra , M Bindi , J C Bizot , C Blohm , T Bold , E G Boos , M Borodin , K Borras , D Boscherini , D Bot , V Boudry , S K Boutle , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , I Brock , E Brownson , R Brugnera , N Brummer , D Bruncko , A Bruni , G Bruni , B Brzozowska , A Bunyatyan , G Buschhorn , P J Bussey , J M Butterworth , B Bylsma , L Bystritskaya , A Caldwell , A J Campbell , K B C Avila , M Capua , R Carlin , C D Catterall , K Cerny , V Cerny , S Chekanov , V Chekelian , A Cholewa , J Chwastowski , J Ciborowski , R Ciesielski , L Cifarelli , F Cindolo , A Contin , J G Contreras , A M Cooper-Sarkar , N Coppola , M Corradi , F Corriveau , M Costa , J A Coughlan , G Cozzika , J Cvach , G D'Agostini , J B Dainton , F Dal Corso , K Daum , M Deak , J de Favereau , B Delcourt , J del Peso , J Delvax , R K Dementiev , S De Pasquale , M Derrick , R C E Devenish , E A De Wolf , C Diaconu , D Dobur , V Dodonov , B A Dolgoshein , A Dossanov , A T Doyle , V Drugakov , A Dubak , L S Durkin , S Dusini , G Eckerlin , V Efremenko , S Egli , Y Eisenberg , A Eliseev , E Elsen , P F Ermolov , A Eskreys , A Falkiewicz , S Fang , L Favart , S Fazio , A Fedotov , R Felst , J Feltesse , J Ferencei , J Ferrando , M I Ferrero , J Figiel , D J Fischer , M Fleischer , A Fomenko , M Forrest , B Foster , S Fourletov , E Gabathuler , A Galas , E Gallo , A Garfagnini , J Gayler , A Geiser , S Ghazaryan , I Gialas , L K Gladilin , D Gladkov , C Glasman , A Glazov , I Glushkov , L Goerlich , N Gogitidze , Y A Golubkov , P Gottlicher , M Gouzevitch , C Grab , I Grabowska-Bold , J Grebenyuk , T Greenshaw , I Gregor , B R Grell , G Grigorescu , G Grindhammer , G Grzelak , C Gwenlan , T Haas , S Habib , D Haidt , W Hain , R Hamatsu , J C Hart , H Hartmann , G Hartner , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , E Hilger , K H Hiller , D Hochman , D Hoffmann , U Holm , R Hori , R Horisberger , K Horton , T Hreus , A Huttmann , G Iacobucci , Z A Ibrahim , Y Iga , R Ingbir , M Ishitsuka , M Jacquet , H P Jakob , X Janssen , F Januschek , M Jimenez , T W Jones , L Jonsson , A W Jung , H Jung , M Jungst , I Kadenko , B Kahle , B Kamaluddin , S Kananov , T Kanno , M Kapichine , U Karshon , F Karstens , I I Katkov , J Katzy , M Kaur , P Kaur , I R Kenyon , A Keramidas , L A Khein , C Kiesling , J Y Kim , D Kisielewska , S Kitamura , R Klanner , M Klein , U Klein , C Kleinwort , T Kluge , A Knutsson , E Koffeman , R Kogler , D Kollar , P Kooijman , I Korol , I A Korzhavina , P Kostka , A Kotanski , U Kotz , H Kowalski , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , P Kulinski , O Kuprash , K Kutak , M Kuze , V A Kuzmin , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , A Lee , V Lendermann , B B Levchenko , S Levonian , A Levy , G Li , V Libov , S Limentani , T Y Ling , K Lipka , A Liptaj , M Lisovyi , B List , J List , E Lobodzinska , W Lohmann , B Lohr , E Lohrmann , J H Loizides , N Loktionova , K R Long , A Longhin , D Lontkovskyi , R Lopez-Fernandez , V Lubimov , J Lukasik , O Y Lukina , P Luzniak , J Maeda , S Magill , A Makankine , I Makarenko , E Malinovski , J Malka , R Mankel , P Marage , A Margotti , G Marini , L Marti , J F Martin , H U Martyn , A Mastroberardino , T Matsumoto , M C K Mattingly , S J Maxfield , A Mehta , I A Melzer-Pellmann , A B Meyer , H Meyer , J Meyer , S Miglioranzi , S Mikocki , I Milcewicz-Mika , F M Idris , V Monaco , A Montanari , F Moreau , A Morozov , J D Morris , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , B Musgrave , K Nagano , T Namsoo , R Nania , T Naumann , P R Newman , D Nicholass , C Niebuhr , A Nigro , A Nikiforov , D Nikitin , Y Ning , U Noor , D Notz , G Nowak , K Nowak , R J Nowak , A E Nuncio-Quiroz , B Y Oh , N Okazaki , K Oliver , K Olkiewicz , J E Olsson , Y Onishchuk , S Osman , O Ota , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , K Papageorgiu , A Parenti , C Pascaud , G D Patel , E Paul , J M Pawlak , B Pawlik , O Pejchal , P G Pelfer , A Pellegrino , E Perez , W Perlanski , H Perrey , A Petrukhin , I Picuric , S Piec , K Piotrzkowski , D Pitzl , R Placakyte , P Plucinski , B Pokorny , N S Pokrovskiy , R Polifka , A Polini , B Povh , A S Proskuryakov , M Przybycien , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , A Raval , T Ravdandorj , D D Reeder , P Reimer , B Reisert , Z Ren , J Repond , Y D Ri , E Rizvi , A Robertson , P Robmann , B Roland , P Roloff , E Ron , R Roosen , A Rostovtsev , M Rotaru , I Rubinsky , J E R Tabasco , S Rusakov , M Ruspa , R Sacchi , D Salek , A Salii , U Samson , D P C Sankey , G Sartorelli , M Sauter , E Sauvan , A A Savin , D H Saxon , M Schioppa , S Schlenstedt , P Schleper , W B Schmidke , S Schmitt , U Schneekloth , L Schoeffel , V Schonberg , A Schoning , T Schorner-Sadenius , H C Schultz-Coulon , J Schwartz , F Sciulli , F Sefkow , R N Shaw-West , L M Shcheglova , R Shehzadi , S Shimizu , L N Shtarkov , S Shushkevich , I Singh , I O Skillicorn , T Sloan , W Slominski , I Smiljanic , W H Smith , V Sola , A Solano , Y Soloviev , D Son , P Sopicki , I Sorokin , V Sosnovtsev , D South , V Spaskov , A Specka , A Spiridonov , H Stadie , L Stanco , Z Staykova , M Steder , B Stella , A Stern , T P Stewart , A Stifutkin , G Stoicea , P Stopa , U Straumann , S Suchkov , D Sunar , G Susinno , L Suszycki , T Sykora , J Sztuk , D Szuba , J Szuba , A D Tapper , E Tassi , V Tchoulakov , J Terron , T Theedt , G Thompson , P D Thompson , H Tiecke , K Tokushuku , T Toll , F Tomasz , J Tomaszewska , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , T Tsurugai , M Turcato , J Turnau , T Tymieniecka , K Urban , C Uribe-Estrada , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , M Vazquez , A Verbytskyi , V Viazlo , S Vinokurova , N N Vlasov , V Volchinski , O Volynets , M von den Driesch , R Walczak , W A T W Abdullah , D Wegener , J J Whitmore , J Whyte , L Wiggers , M Wing , C Wissing , M Wlasenko , G Wolf , H Wolfe , K Wrona , E Wunsch , A G Yagues-Molina , S Yamada , Y Yamazaki , R Yoshida , C Youngman , J Zacek , J Zalesak , A F Zarnecki , L Zawiejski , O Zeniaev , W Zeuner , Z Zhang , B O Zhautykov , A Zhokin , C Zhou , A Zichichi , T Zimmermann , H Zohrabyan , M Zolko , F Zomer , D S Zotkin (2010) Combined measurement and QCD analysis of the inclusive e(+/-)p scattering cross sections at HERA JOURNAL OF HIGH ENERGY PHYSICS 1. JAN Abstract: A combination is presented of the inclusive deep inelastic cross sections measured by the H1 and ZEUS Collaborations in neutral and charged current unpolarised e(+/-)p scattering at HERA during the period 1994-2000. The data span six orders of magnitude in negative four-momentum-transfer squared, Q(2), and in Bjorken x. The combination method used takes the correlations of systematic uncertainties into account, resulting in an improved accuracy. The combined data are the sole input in a NLO QCD analysis which determines a new set of parton distributions, HERAPDF1.0, with small experimental uncertainties. This set includes an estimate of the model and parametrisation uncertainties of the fit result.
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F D Aaron , C Alexa , K Alimujiang , V Andreev , B Antunovic , A Asmone , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer , R Zus (2010) Jet production in ep collisions at high Q(2) and determination of alpha(s) EUROPEAN PHYSICAL JOURNAL C 65: 3-4. 363-383 FEB Abstract: The production of jets is studied in deep-inelastic e(+/-) p scattering at large negative four momentum transfer squared 150 < Q(2) < 15000 GeV2 using HERA data taken in 1999-2007, corresponding to an integrated luminosity of 395 pb(-1). Inclusive jet, 2-jet and 3-jet cross sections, normalised to the neutral current deep-inelastic scattering cross sections, are measured as functions of Q(2), jet transverse momentum and proton momentum fraction. The measurements are well described by perturbative QCD calculations at next-to-leading order corrected for hadronisation effects. The strong coupling as determined from these measurements
Notes:
F D Aaron , C Alexa , K Alimujiang , V Andreev , B Antunovic , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , B Delcourt , J Delvax , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrer , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , K Nowak , J E Olsson , S Osman , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer (2010) Measurement of the D*(+/-) meson production cross section and F-2(c(c)over-bar) at high Q(2) in ep scattering at HERA PHYSICS LETTERS B 686: 2-3. 91-100 MAR 22 Abstract: The inclusive production of D*(+/-)(2010) mesons in deep-inelastic e(+/-)p scattering is measured in the kinematic region of photon virtuality 100 < Q(2) < 1000 GeV2 and inelasticity 002 < y < 0 7 Single and double differential cross sections for inclusive D* meson production are measured in the visible range defined by vertical bar eta(D*)vertical bar < 1 5 and p(gamma)(D*) > 1 5 GeV The data were collected by the H1 experiment during the period from 2004 to 2007 and correspond to an integrated luminosity of 351 pb(-1) The charm contribution. F-2(c (c) over bar), to the proton structure function F-2 is determined. The measurements are compared with QCD predictions. (C) 2010 Elsevier B V All rights reserved
Notes:
F D Aaron , C Alexa , V Andreev , B Antunovic , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , B Delcourt , J Delvax , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , E Kosior , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , K Nowak , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer (2010) Jet production in ep collisions at low Q(2) and determination of alpha(s) EUROPEAN PHYSICAL JOURNAL C 67: 1-2. 1-24 MAY Abstract: The production of jets is studied in deep-inelastic e(+) p scattering at low negative four momentum transfer squared 5 < Q(2) < 100 GeV2 and at inelasticity 0.2 < y < 0.7 using data recorded by the H1 detector at HERA in the years 1999 and 2000, corresponding to an integrated luminosity of 43.5 pb(-1). Inclusive jet, 2-jet and 3-jet cross sections as well as the ratio of 3-jet to 2-jet cross sections are measured as a function of Q(2) and jet transverse momentum. The 2-jet cross section is also measured as a function of the proton momentum fraction xi. The measurements are well described by perturbative quantum chromodynamics at next-to-leading order corrected for hadronisation effects and are subsequently used to extract the strong coupling as.
Notes:
F D Aaron , C Alexa , V Andreev , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A Campbell , K B C Avila , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , J Cvach , J B Dainton , K Daum , M Deak , B Delcourt , J Delvax , E A De Wolf , C Diaconu , M Dobre , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , F Huber , M Jacquet , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , P Kostka , M Kraemer , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , K Lipka , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , K Nowak , J E Olsson , S Osman , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , H Pirumov , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , G Thompson , P D Thompson , T Toll , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , M von den Driesch , D Wegener , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2010) Diffractive dijet photoproduction in ep collisions at HERA EUROPEAN PHYSICAL JOURNAL C 70: 1-2. 15-37 NOV Abstract: Measurements are presented of single and double-differential dijet cross sections in diffractive photoproduction based on a data sample with an integrated luminosity of 47 pb(-1). The events are of the type ep -> eXY, where the hadronic system X contains at least two jets and is separated by a large rapidity gap from the system Y, which consists of a leading proton or low-mass proton excitation. The dijet cross sections are compared with QCD calculations at next-to-leading order and with a Monte Carlo model based on leading order matrix elements with parton showers. The measured cross sections are smaller than those obtained from the next-to-leading order calculations by a factor of about 0.6. This suppression factor has no significant dependence on the fraction x (gamma) of the photon four-momentum entering the hard subprocess. Ratios of the diffractive to the inclusive dijet cross sections are measured for the first time and are compared with Monte Carlo models.
Notes:
F Aaron , C Alexa , V Andreev , B Antunovic , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B Avila , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , B Delcourt , J Delvax , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , A Grebenyuk , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , X Janssen , L Jonsson , A Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Latovika-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , K Nowak , J E Olsson , S Osman , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R PlaakytAu , B Pokorny , R Polifka , B Povh , V Radescu , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Valle , P Van Mechelen , A V Trevino , Y Vazdik , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zaleak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer (2010) Inelastic production of J/psi mesons in photoproduction and deep inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 68: 3-4. 401-420 AUG Abstract: A measurement is presented of inelastic photoand electroproduction of J/psi mesons in ep scattering at HERA. The data were recorded with the H1 detector in the period from 2004 to 2007. Single and double differential cross sections are determined and the helicity distributions of the J/psi mesons are analysed. The results are compared to theoretical predictions in the colour singlet model and in the framework of non- relativistic QCD. Calculations in the colour singlet model using a k(T) factorisation ansatz are able to give a good description of the data, while colour singlet model calculations to next- to- leading order in collinear factorisation underestimate the data.
Notes:
F D Aaron , C Alexa , V Andreev , B Antunovic , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A Campbell , K B C Avila , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , B Delcourt , J Delvax , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , X Janssen , L Jonsson , A Jung , H Jung , M Kapichine , J Katzy , I Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M Landon , W Lange , G Latovika-Medin , P Laycock , A Lebedev , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S Maxfield , A Mehta , A Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J Morris , M Mozer , M Mudrinic , K Muller , P Murin , T Naumann , P Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , K Nowak , J Olsson , S Osman , D Ozerov , P Pahl , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R PlaakytAu , B Pokorny , R Polifka , B Povh , V Radescu , A Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J Ruiz Tabasco , S Rusakov , D Salek , D Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R Shaw-West , L Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P Thompson , T Toll , F Tomasz , T Tran , D Traynor , T Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Mechelen , A Vargas Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zaleak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer (2010) Measurement of leading neutron production in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 68: 3-4. 381-399 AUG Abstract:
Notes:
F D Aaron , M A Martin , C Alexa , V Andreev , B Antunovic , A Asmone , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , M E Janssen , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer , R Zus (2010) Diffractive electroproduction of rho and phi mesons at HERA JOURNAL OF HIGH ENERGY PHYSICS 5. MAY Abstract: Diffractive electroproduction of rho and phi mesons is measured at HERA with the H1 detector in the elastic and proton dissociative channels. The data correspond to an integrated luminosity of 51 pb(-1). About 10500 rho and 2000 phi events are analysed in the kinematic range of squared photon virtuality 2.5 <= Q(2) <= 60 GeV(2), photon-proton centre of mass energy 35 <= W <= 180 GeV and squared four-momentum transfer to the proton vertical bar t vertical bar <= 3 GeV(2). The total, longitudinal and transverse cross sections are measured as a function of Q(2), W and vertical bar t vertical bar. The measurements show a transition to a dominantly "hard" behaviour, typical of high gluon densities and small q (q) over bar dipoles, for Q(2) larger than 10 to 20 GeV(2). They support flavour independence of the diffractive exchange, expressed in terms of the scaling variable (Q(2) + M(V)(2))/4, and proton vertex factorisation. The spin density matrix elements are measured as a function of kinematic variables. The ratio of the longitudinal to transverse cross sections, the ratio of the helicity amplitudes and their relative phases are extracted. Several of these measurements have not been performed before and bring new information on the dynamics of diffraction in a QCD framework. The measurements are discussed in the context of models using generalised parton distributions or universal dipole cross sections.
Notes:
2009
F D Aaron , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Bacchetta , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , M Beckingham , K Begzsuren , O Behnke , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , A Eliseev , E Elsen , S Essenov , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , A Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , H Peng , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , P Smirnov , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , I Tsurin , J Turnau , E Tzamariudaki , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , D Wegener , M Wessels , C Wissing , E Wunsch , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyan , F Zomer (2009) Strangeness production at low Q(2) in deep-inelastic ep scattering at HERA EUROPEAN PHYSICAL JOURNAL C 61: 2. 185-205 MAY Abstract: The production of neutral strange hadrons is investigated using deep-inelastic scattering events measured with the H1 detector at HERA. The measurements are made in the phase space defined by the negative four-momentum transfer squared of the photon 2 < Q(2) < 100 GeV2 and the inelasticity 0.1 < y < 0.6. The K-s(0) s and Lambda((Lambda) over bar) production cross sections and their ratios are determined. K-s(0) s production is compared to the production of charged particles in the same region of phase space. The Lambda-(Lambda) over bar asymmetry is also measured and found to be consistent with zero. Predictions of leading order Monte Carlo programs are compared to the data.
Notes:
F D Aaron , C Alexa , K Alimujiang , V Andreev , B Antunovic , A Asmone , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer , R Zus (2009) Search for excited quarks in ep collisions at HERA PHYSICS LETTERS B 678: 4. 335-343 JUL 27 Abstract: A search for excited quarks is performed using the full e(+/-)p data sample collected by the HI experiment at HERA, corresponding to a total integrated luminosity of 475 pb(-1). The electroweak decays of excited quarks q* -> q gamma. q* -> qZ and q* - qW with Subsequent hadronic or leptonic decays of the W and Z bosons are considered. No evidence for first generation excited quark production is found. Mass dependent exclusion limits on q* production cross sections and on the ratio f/Lambda of the coupling to the compositeness scale are derived Within gauge mediated models. These limits extend the excluded region compared to previous excited quark searches. (C) 2009 Elsevier B.V. All rights reserved.
Notes:
F D Aaron , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , O Behnke , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , M Wessels , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer (2009) A general search for new phenomena at HERA PHYSICS LETTERS B 674: 4-5. 257-268 APR 27 Abstract: A model-independent search for deviations from the Standard Model prediction is performed using the full e(+/-) p data sample collected by the H1 experiment at HERA. All event topologies involving isolated electrons, photons, muons, neutrinos and jets with transverse momenta above 20 GeV are investigated in a single analysis. Events are assigned to exclusive classes according to their final state. A dedicated algorithm is used to search for deviations from the Standard Model in the distributions of the scalar sum of transverse momenta or the invariant mass of final state particles and to quantify their significance. Variables related to angular distributions and energy sharing between final state particles are also introduced to study the final state topologies. No significant deviation from the Standard Model expectation is observed in the phase space covered by this analysis. (C) 2009 Elsevier B.V. All rights reserved.
Notes:
F D Aaron , M A Martin , C Alexa , K Alimujiang , V Andreev , B Antunovic , A Asmone , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , M E Janssen , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer , R Zus (2009) Search for single top quark production at HERA PHYSICS LETTERS B 678: 5. 450-458 AUG 3 Abstract: A search for single top quark production is performed in the full e(+/-)p data sample collected by the H1 experiment at HERA, corresponding to an integrated luminosity of 474 pb(-1). Decays of top quarks into a b quark and a W boson with Subsequent leptonic or hadronic decay of the W are investigated. A multivariate analysis is performed to discriminate top quark production from Standard Model background processes. An upper limit on the top quark production cross section via flavour changing neutral current processes sigma(ep -> et X) < 0.25 pb is established at 95% CL. Limits on the anomalous coupling K(tu gamma) are derived. (C) 2009 Elsevier B.V. All rights reserved.
Notes:
F D Aaron , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Bacchetta , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , M Beckingham , K Begzsuren , O Behnke , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , S Essenov , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , A Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G Patel , O Pejchal , H Peng , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , P Smirnov , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , I Tsurin , J Turnau , E Tzamariudaki , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , D Wegener , M Wessels , C Wissing , E Wunsch , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyan , F Zomer (2009) Study of charm fragmentation into D (* +/-) mesons in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 59: 3. 589-606 FEB Abstract: The process of charm quark fragmentation is studied using D (* +/-) meson production in deep-inelastic scattering as measured by the H1 detector at HERA. The parameters of fragmentation functions are extracted for QCD models based on leading order matrix elements and DGLAP or CCFM evolution of partons together with string fragmentation and particle decays. Additionally, they are determined for a next-to-leading order QCD calculation in the fixed flavour number scheme using the independent fragmentation of charm quarks to D (* +/-) mesons. Two different regions of phase space are investigated defined by the presence or absence of a jet containing the D (* +/-) meson in the event. The fragmentation parameters extracted for the two phase space regions are found to be different.
Notes:
F D Aaron , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Bacchetta , S Backovic , A Baghdasaryan , R Baranov , E Barrelet , W Bartel , M Beckingham , K Begzsuren , O Behnk , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , S Essenov , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , A Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , R Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , R Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , H Peng , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , R Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoening , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , S Shushkevich , T Sloan , I Smijanic , R Smirnov , Y Soloviev , R Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , R Truol , I Tsakov , B Tseepeldorj , I Tsurin , J Turnau , E Tzamariudaki , K Urban , A Valkarova , C Vallee , R Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , D Wegener , M Wessels , C Wissing , E Wunsch , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyan , F Zomer (2009) Measurement of diffractive scattering of photons with large momentum transfer at HERA PHYSICS LETTERS B 672: 3. 219-226 FEB 23 Abstract: The first measurement of diffractive scattering of quasi-real photons with large momentum transfer gamma p -> gamma Y, where Y is the proton dissociative system, is made using the H1 detector at HERA. The measurement is performed for initial photon virtualities Q(2) < 0.01 GeV(2). Single differential cross sections are Measured as a function of W, the incident photon-proton centre of mass energy, and t, the square of the four-momentum transferred at the proton vertex, in the range 175 < W < 247 GeV and 4 < |t| < 36 GeV(2). The W dependence is well described by a model based on perturbative QCD using a leading logarithmic approximation of the BFKL evolution. The measured |t| dependence is harder than that predicted by the model and those observed in exclusive vector meson production. (C) 2009 Published by Elsevier B.V.
Notes:
F D Aaron , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , O Behnke , A Belousov , N Berger , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , V Korbel , R Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer (2009) Inclusive photoproduction of rho(0), K*(0) and phi mesons at HERA H1 Collaboration PHYSICS LETTERS B 673: 2. 119-126 MAR 16 Abstract: Inclusive non-diffractive photoproduction of rho(770)(0), K*(892)(0) and phi(1020) mesons is investigated with the H1 detector in ep collisions at HERA. The corresponding average gamma p centre-of-mass energy is 210 GeV. The mesons are measured in the transverse momentum range 0.5 < p(T) < 7 GeV and the rapidity range vertical bar y(lab)vertical bar < 1. Differential cross sections are presented as a function of transverse momentum and rapidity, and are compared to the predictions of hadroproduction models. (C) 2009 Elsevier B.V. All rights reserved.
Notes:
F D Aaron , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , O Behnke , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , S Essenov , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , A Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , D Wegener , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer (2009) Events with isolated leptons and missing transverse momentum and measurement of W production at HERA EUROPEAN PHYSICAL JOURNAL C 64: 2. 251-271 NOV Abstract: Events with high energy isolated electrons, muons or tau leptons and missing transverse momentum are studied using the full e(+/-)p data sample collected by the H1 experiment at HERA, corresponding to an integrated luminosity of 474 pb(-1). Within the Standard Model, events with isolated leptons and missing transverse momentum mainly originate from the production of single W bosons. The total single W boson production cross section is measured as 1.14 +/- 0.25 (stat.) +/- 0.14 (sys.) pb, in agreement with the Standard Model expectation. The data are also used to establish limits on the WW gamma gauge couplings and for a measurement of the W boson polarisation.
Notes:
F D Aaron , C Alexa , K Alimujiang , V Andreev , B Antunovic , A Asmone , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , R Wallny , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer , R Zus (2009) A precision measurement of the inclusive ep scattering cross section at HERA EUROPEAN PHYSICAL JOURNAL C 64: 4. 561-587 DEC Abstract: A measurement of the inclusive deep inelastic neutral current e(+) p scattering cross section is reported in the region of four-momentum transfer squared, 12GeV(2) <= Q(2) <= 150 GeV(2), and Bjorken x, 2 x 10(-4) <= x <= 0.1. The results are based on data collected by the H1 Collaboration at the ep collider HERA at positron and proton beam energies of E(e) = 27.6 GeV and E(p) = 920 GeV, respectively. The data are combined with previously published data, taken at E(p) = 820 GeV. The accuracy of the combined measurement is typically in the range of 1.3-2%. A QCD analysis at next-to-leading order is performed to determine the parton distributions in the proton based on H1 data.
Notes:
F D Aaron , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , O Behnke , O Behrendt , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , D Eckstein , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovika-Medin , P Laycock , T Latovika , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer (2009) Measurement of the inclusive ep scattering cross section at low Q (2) and x at HERA EUROPEAN PHYSICAL JOURNAL C 63: 4. 625-678 OCT Abstract: A measurement of the inclusive ep scattering cross section is presented in the region of low momentum transfers, 0.2 GeV2 a parts per thousand currency signQ (2)a parts per thousand currency sign12 GeV2, and low Bjorken x, 5a <...10(-6)a parts per thousand currency signxa parts per thousand currency sign0.02. The result is based on two data sets collected in dedicated runs by the H1 Collaboration at HERA at beam energies of 27.6 GeV and 920 GeV for positrons and protons, respectively. A combination with data previously published by H1 leads to a cross section measurement of a few percent accuracy. A kinematic reconstruction method exploiting radiative ep events extends the measurement to lower Q (2) and larger x. The data are compared with theoretical models which apply to the transition region from photoproduction to deep inelastic scattering.
Notes:
F D Aaron , M A Martin , C Alexa , K Alimujiang , V Andreev , B Antunovic , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , M E Janssen , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Seflow , R N Shaw-West , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevinok , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer , R Zus (2009) Deeply virtual Compton scattering and its beam charge asymmetry in e(+/-)p collisions at HERA PHYSICS LETTERS B 681: 5. 391-399 NOV 16 Abstract: A measurement of elastic deeply virtual Compton scattering gamma*p --> gamma p using e(+) p and e(-) p collision data recorded with the HI detector at HERA is presented. The analysed data sample corresponds to an integrated luminosity of 306 pb(-1), almost equally shared between both beam charges. The cross section is measured as a function of the virtuality Q(2) of the exchanged photon and the centre-of-mass energy W of the gamma*p system in the kinematic domain 6.5 < Q(2) < 80 GeV2, 30 < W < 140 GeV and |t| < 1 GeV2, where t denotes the squared momentum transfer at the proton vertex. The cross section is determined differentially in t for different Q(2) and W values and exponential t-slope parameters are derived. Using e(+) p and e(-) p data samples, a beam charge asymmetry is extracted for the first time in the low Biorken x kinematic domain. The observed asymmetry is attributed to the interference between Bethe-Heitler and deeply virtual Compton scattering processes. Experimental results are discussed in the context of two different models, one based on generalised parton distributions and one based on the dipole approach. (C) 2009 Elsevier B.V. All rights reserved.
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F D Aaron , M A Martin , C Alexa , K Alimujiang , V Andreev , B Antunovic , A Asmone , S Backovic , A Baghdasaryan , E Barrelet , W Bartel , K Begzsuren , A Belousov , J C Bizot , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , A Falkiewicz , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , D J Fischer , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , T Hreus , M Jacquet , M E Janssen , X Janssen , L Jonsson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , A Knutsson , R Kogler , R Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , L Lytkin , A Makankine , E Malinovski , R Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopou , C Pascaud , G D Patel , O Pejchal , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Pokorny , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , D P C Sankey , M Sauter , E Sauvan , S Schmitt , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , G Stoicea , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , J Turnau , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , M von den Driesch , D Wegener , C Wissing , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , T Zimmermann , H Zohrabyan , F Zomer , R Zus (2009) Observation of the hadronic final state charge asymmetry in high Q(2) deep-inelastic scattering at HERA PHYSICS LETTERS B 681: 2. 125-133 OCT 26 Abstract: A first measurement is presented of the charge asymmetry in the hadronic final state from the hard interaction in deep-inelastic ep neutral current scattering at HERA. The measurement is performed in the range of negative squared four momentum transfer 100 < Q(2) < 8000 GeV2. The difference between the event normalised distributions of the scaled momentum, x(p), for positively and negatively charged particles, measured in the current region of the Breit frame, is studied together with its evolution as a function of Q. The results are compared to Monte Carlo models at the hadron and parton levels. (C) 2009 Elsevier B.V. All rights reserved.
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F D Aaron , H Abramowicz , I Abt , L Adamczyk , M Adamus , M A Martin , C Alexa , K Alimujiang , V Andreev , S Antonelli , P Antonioli , A Antonov , B Antunovic , M Arneodo , A Asmone , V Aushev , O Bachynska , S Backovic , A Baghdasaryan , A Bamberger , A N Barakbaev , G Barbagli , G Bari , F Barreiro , E Barrelet , W Bartel , D Bartsch , M Basile , K Begzsuren , O Behnke , J Behr , U Behrens , L Bellagamba , A Belousov , A Bertolin , S Bhadra , M Bindi , J C Bizot , C Blohm , T Bold , E G Boos , M Borodin , K Borras , D Boscherini , D Bot , V Boudry , S K Boutle , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , I Brock , E Brownson , R Brugnera , N Brummer , D Bruncko , A Bruni , G Bruni , B Brzozowska , A Bunyatyan , G Buschhorn , P J Bussey , J M Butterworth , B Bylsma , L Bystritskaya , A Caldwell , A J Campbell , K B C Avila , M Capua , R Carlin , F Cassol-Brunner , C D Catterall , K Cerny , V Cerny , S Chekanov , V Chekelian , A Cholewa , J Chwastowski , J Ciborowski , R Ciesielski , L Cifarelli , F Cindolo , A Contin , J G Contreras , A M Cooper-Sarkar , N Coppola , M Corradi , F Corriveau , M Costa , J A Coughlan , G Cozzika , J Cvach , G D'Agostini , J B Dainton , F Dal Corso , K Daum , M Deak , Y de Boer , J de Favereau , B Delcourt , M Del Degan , J del Peso , J Delvax , R K Dementiev , S De Pasquale , M Derrick , R C E Devenish , E A De Wolf , C Diaconu , D Dobur , V Dodonov , B A Dolgoshein , A Dossanov , A T Doyle , V Drugakov , A Dubak , L S Durkin , S Dusini , G Eckerlin , V Efremenko , S Egli , Y Eisenberg , A Eliseev , E Elsen , P F Ermolov , A Eskreys , A Falkiewicz , S Fang , L Favart , S Fazio , A Fedotov , R Felst , J Feltesse , J Ferencei , J Ferrando , M I Ferrero , J Figiel , D J Fischer , M Fleischer , A Fomenko , M Forrest , B Foster , S Fourletov , E Gabathuler , A Galas , E Gallo , A Garfagnini , J Gayler , A Geiser , S Ghazaryan , I Gialas , L K Gladilin , D Gladkov , C Glasman , A Glazov , I Glushkov , L Goerlich , N Gogitidze , Y A Golubkov , P Gottlicher , M Gouzevitch , C Grab , I Grabowska-Bold , J Grebenyuk , T Greenshaw , I Gregor , B R Grell , G Grigorescu , G Grindhammer , G Grzelak , C Gwenlan , T Haas , S Habib , D Haidt , W Hain , R Hamatsu , J C Hart , H Hartmann , G Hartner , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , M Herbst , G Herrera , M Hildebrandt , E Hilger , K H Hiller , D Hochman , D Hoffmann , U Holm , R Hori , R Horisberger , K Horton , T Hreus , A Huttmann , G Iacobucci , Z A Ibrahim , Y Iga , R Ingbir , M Ishitsuka , M Jacquet , H P Jakob , M E Janssen , X Janssen , F Januschek , M Jimenez , T W Jones , L Jonsson , A W Jung , H Jung , M Jungst , I Kadenko , B Kahle , B Kamaluddin , S Kananov , T Kanno , M Kapichine , U Karshon , F Karstens , I I Katkov , J Katzy , M Kaur , P Kaur , I R Kenyon , A Keramidas , L A Khein , C Kiesling , J Y Kim , D Kisielewska , S Kitamura , R Klanner , M Klein , U Klein , C Kleinwort , T Kluge , A Knutsson , E Koffeman , R Kogler , D Kollar , P Kooijman , I A Korzhavina , P Kostka , A Kotanski , U Kotz , H Kowalski , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , P Kulinski , O Kuprash , K Kutak , M Kuze , V A Kuzmin , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , A Lee , G Leibenguth , V Lendermann , B B Levchenko , S Levonian , A Levy , G Li , V Libov , S Limentani , T Y Ling , K Lipka , A Liptaj , M Lisovyi , B List , J List , E Lobodzinska , W Lohmann , B Lohr , E Lohrmann , J H Loizides , N Loktionova , K R Long , A Longhin , D Lontkovskyi , R Lopez-Fernandez , V Lubimov , J Lukasik , O Y Lukina , P Luzniak , L Lytkin , J Maeda , S Magill , A Makankine , I Makarenko , E Malinovski , J Malka , R Mankel , P Marage , A Margotti , G Marini , L Marti , J F Martin , H U Martyn , A Mastroberardino , T Matsumoto , M C K Mattingly , S J Maxfield , A Mehta , I A Melzer-Pellmann , A B Meyer , H Meyer , J Meyer , V Michels , S Miglioranzi , S Mikocki , I Milcewicz-Mika , F M Idris , V Monaco , A Montanari , F Moreau , A Morozov , J D Morris , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , B Musgrave , K Nagano , T Namsoo , R Nania , T Naumann , P R Newman , D Nicholass , C Niebuhr , A Nigro , A Nikiforov , Y Ning , U Noor , D Notz , G Nowak , K Nowak , R J Nowak , M Nozicka , A E Nuncio-Quiroz , B Y Oh , N Okazaki , K Oliver , B Olivier , K Olkiewicz , J E Olsson , S Osman , O Ota , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , K Papageorgiu , A Parenti , C Pascaud , G D Patel , E Paul , J M Pawlak , B Pawlik , O Pejchal , P G Pelfer , A Pellegrino , E Perez , W Perlanski , H Perrey , A Petrukhin , I Picuric , S Piec , K Piotrzkowski , D Pitzl , R Placakythe , P Plucinski , B Pokorny , N S Pokrovskiy , R Polifka , A Polini , B Povh , T Preda , A S Proskuryakov , M Przybycien , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , A Raval , T Ravdandorj , D D Reeder , P Reimer , B Reisert , Z Ren , J Repond , Y D Ri , E Rizvi , A Robertson , P Robmann , B Roland , P Roloff , E Ron , R Roosen , A Rostovtsev , M Rotaru , I Rubinsky , J E R Tabasco , Z Rurikova , S Rusakov , M Ruspa , R Sacchi , D Salek , U Samson , D P C Sankey , G Sartorelli , M Sauter , E Sauvan , A A Savin , D H Saxon , M Schioppa , S Schlenstedt , P Schleper , W B Schmidke , S Schmitt , U Schneekloth , L Schoeffel , V Schonberg , A Schoning , T Schorner-Sadenius , H C Schultz-Coulon , J Schwartz , F Sciulli , F Sefkow , R N Shaw-West , L M Shcheglova , R Shehzadi , S Shimizu , L N Shtarkov , S Shushkevich , I Singh , I O Skillicorn , T Sloan , W Slominski , I Smiljanic , W H Smith , V Sola , A Solano , Y Soloviev , D Son , P Sopicki , I Sorokin , V Sosnovtsev , D South , V Spaskov , A Specka , A Spiridonov , H Stadie , L Stanco , Z Staykova , M Steder , B Stella , A Stern , T P Stewart , A Stifutkin , G Stoicea , P Stopa , U Straumann , S Suchkov , D Sunar , G Susinno , L Suszycki , T Sykora , J Sztuk , D Szuba , J Szuba , A D Tapper , E Tassi , V Tchoulakov , J Terron , T Theedt , G Thompson , P D Thompson , H Tiecke , K Tokushuku , T Toll , F Tomasz , J Tomaszewska , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , T Tsurugai , M Turcato , J Turnau , T Tymieniecka , K Urban , C Uribe-Estrada , A Valkarovha , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , M Vazquez , A Verbytskyi , S Vinokurova , N N Vlasov , V Volchinski , O Volynets , M von den Driesch , R Walczak , W A T W Abdullah , D Wegener , J J Whitmore , J Whyte , L Wiggers , M Wing , C Wissing , M Wlasenko , G Wolf , H Wolfe , K Wrona , E Wunsch , A G Yagues-Molina , S Yamada , Y Yamazaki , R Yoshida , C Youngman , J Zacek , J Zalesak , A F Zarnecki , L Zawiejski , W Zeuner , Z Zhang , B O Zhautykov , A Zhokin , C Zhou , A Zichichi , T Zimmermann , H Zohrabyan , M Zolko , F Zomer , D S Zotkin , R Zus (2009) Multi-leptons with high transverse momentum at HERA JOURNAL OF HIGH ENERGY PHYSICS 10. OCT Abstract: Events with at least two high transverse momentum leptons (electrons or muons) are studied using the H1 and ZEUS detectors at HERA with an integrated luminosity of 0.94 fb(-1). The observed numbers of events are in general agreement with the Standard Model predictions. Seven di- and tri-lepton events are observed in e(+)p collision data with a scalar sum of the lepton transverse momenta above 100 GeV while 1.94 +/- 0.17 events are expected. Such events are not observed in e(-)p collisions for which 1.19 +/- 0.12 are predicted. Total visible and differential di-electron and di-muon photoproduction cross sections are extracted in a restricted phase space dominated by photon-photon collisions.
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2008
F D Aaron , A Aktas , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , M Beckingham , K Begzsuren , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daume , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , A Fomenko , G Franke , T Frisson , E Gabathuler , J Gayler , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , G Heinzelmann , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , A Knutsson , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , L Lindfeld , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , P Prideaux , V Radescu , A J Rahmat , N Raicevic , T Ravdandorj , P Reimer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , D Salek , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , I Smiljanic , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , J Stiewe , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , G Weber , R Weber , D Wegener , C Werner , M Wessels , C Wissing , R Wolf , E Wunsch , S Xella , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyan , F Zomer (2008) Three- and four-jet production at low x at HERA EUROPEAN PHYSICAL JOURNAL C 54: 3. 389-409 APR Abstract: Three- and four-jet production is measured in deep-inelastic ep scattering at low x and Q(2) with the H1 detector using an integrated luminosity of 44.2 pb(-1). Several phase space regions are selected for the three-jet analysis in order to study the underlying parton dynamics from global topologies to the more restrictive regions of forward jets close to the proton direction. The measurements of cross sections for events with at least three jets are compared to fixed order QCD predictions of O(alpha(2)(s)) and O(alpha(3)(s)) and with Monte Carlo simulation programs where higher order effects are approximated by parton showers. A good overall description is provided by the O(alpha(3)(s)) calculation. Too few events are predicted at the lowest x similar to 10(-4), especially for topologies with two forward jets. This hints to large contributions at low x from initial state radiation of gluons close to the proton direction and unordered in transverse momentum. The Monte Carlo program in which gluon radiation is generated by the colour dipole model gives a good description of both the three- and the four-jet data in absolute normalisation and shape.
Notes:
F D Aaron , A Aktas , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , S Backovic , A Baghdasaryan , P Baranov , E Barreletl , W Barte , S Baudrand , M Beckingham , K Begzsuren , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzikao , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , A Fomenko , G Franke , T Frisson , E Gabathuler , J Gayler , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , G Heinzelmann , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , A Knutsson , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , L Lindfeld , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , P Prideaux , V Radescu , A J Rahmat , N Raicevic , T Ravdandorj , P Reimer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , D Salek , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , I Smiljanic , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , J Stiewe , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , G Weber , R Weber , D Wegener , C Werner , M Wessels , C Wissing , R Wolf , E Wunsch , S Xella , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyan , F Zomer (2008) Measurement of isolated photon production in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 54: 3. 371-387 APR Abstract: The production of isolated photons in deep-inelastic scattering ep -> e gamma X is measured with the H1 detector at HERA. The measurement is performed in the kinematic range of negative four-momentum transfer squared 4 < Q(2)< 150 GeV2 and a mass of the hadronic system W-X > 50 GeV. The analysis is based on a total integrated luminosity of 227 pb(-1). The production cross section of isolated photons with a transverse energy in the range 3 < E-T(gamma)< 10 GeV and pseudorapidity range -1.2 <eta(gamma)< 1.8 is measured as a function of E-T(gamma), eta(gamma) and Q(2). Isolated photon cross sections are also measured for events with no jets or at least one hadronic jet. The measurements are compared with predictions from Monte Carlo generators modelling the photon radiation from the quark and the electron lines, as well as with calculations at leading and next to leading order in the strong coupling. The predictions significantly underestimate the measured cross sections.
Notes:
F D Aaron , A Aktas , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , M Beckingham , K Begzsuren , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , A Fomenko , G Franke , T Frisson , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , G Heinzelmann , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , A Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , L Lindfeld , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , P Prideaux , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , D Salek , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , I Smiljanic , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , J Stiewe , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , I Tsurin , J Turnau , E Tzamariudaki , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , G Weber , R Weber , D Wegener , C Werner , M Wessels , C Wissing , R Wolf , E Wunsch , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyan , F Zomer (2008) Measurement of deeply virtual Compton scattering and its t-dependence at HERA PHYSICS LETTERS B 659: 4. 796-806 JAN 31 Abstract: A measurement of elastic deeply virtual Compton scattering gamma*p->gamma p using e-p collision data recorded with the H1 detector at HERA is presented. The analysed data sample corresponds to an integrated luminosity of 145 pb(-1). The cross section is measured as a function of the virtuality Q(2) of the exchanged photon and the centre-of-mass energy W of the gamma*p system in the kinematic domain 6.5 < Q(2) < 80 GeV(2), 30 < W < 140 GeV and vertical bar t vertical bar < 1 GeV(2), where t denotes the squared momentum transfer at the proton vertex. The cross section is determined differentially in t for different Q(2) and W values and exponential t-slope parameters are derived. The measurements are compared to a NLO QCD calculation based on generalised parton distributions. In the context of the dipole approach, the geometric scaling property of the DVCS cross section is studied for different values of t.
Notes:
F D Aaron , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , M Beckingham , K Begzsuren , O Behnke , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , A Fomenko , G Franke , T Frisson , E Gabathuler , J Gayler , S Ghazaryan , A Giazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , I Kluge , A Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kroger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , H Peng , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , V Radescu , A Rahmat , N Raicevic , A Raspiareza , I Ravdandorj , P Reimer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , I Sloan , I Smijanic , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , U Straumann , D Sunar , I Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , I Tsurin , J Turnau , E Tzamariudaki , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinskial , D Wegener , M Wessels , C Wissing , R Wolf , E Wunsch , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyan , F Zomer (2008) A search for excited neutrinos in e(-) p collisions at HERA PHYSICS LETTERS B 663: 5. 382-389 JUN 5 Abstract: A search for first generation excited neutrinos is performed using the full e(-) p data sample collected by the HI experiment at HERA at a centre-of-mass energy of 319 GeV, corresponding to a total luminosity of 184 pb(-1). The electroweak decays of excited neutrinos nu* -> nu gamma, v* -> nu Z and nu* -> eW with subsequent hadronic or leptonic decays of the W and Z bosons are considered. No evidence for excited neutrino production is found. Mass dependent exclusion limits on nu* production cross sections and on the ratio of the coupling to the compositeness scale f/boolean AND are derived within gauge mediated models. A limit on f/boolean AND A, independent of the relative couplings to the SU(2) and U(1) gauge bosons, is also determined. These limits extend the excluded region to higher masses than has been possible in previous excited neutrino searches. (c) 2008 Elsevier B.V. All rights reserved.
Notes:
F D Aaron , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Bacchetta , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , M Beckingharn , K Begzsuren , O Behnke , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , S Essenov , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , A Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , H Peng , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , S Shushkevich , T Sloan , I Smijanic , P Smirnov , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truoel , I Tsakov , B Tseepeldorj , I Tsurin , J Turnau , E Tzamariudaki , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , D Wegener , M Wessels , C Wissing , E Wunsch , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyan , F Zomer (2008) Measurement of the proton structure function F(L)(x, Q(2)) at low x PHYSICS LETTERS B 665: 4. 139-146 JUL 24 Abstract: A first measurement is reported of the longitudinal proton structure function FL(X, Q(2)) at the ep collider HERA. It is based on inclusive deep inelastic e(+)p scattering cross section measurements with a positron beam energy of 27.5 GeV and proton beam energies of 920, 575 and 460 GeV. Employing the energy dependence of the cross section, FL is measured in a range of squared four-momentum transfers 12 <= Q2 <=, 90 GeV(2) and low Bjorken x 0.00024 <= x <= 0.0036. The F(L) values agree with higher order QCD calculations based on parton densities obtained using cross section data previously measured at HERA. (C) 2008 Elsevier B.V. All rights reserved.
Notes:
F D Aaron , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Bacchetta , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , M Beckingham , K Begzsuren , O Behnke , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , S Essenov , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , C Helebrant , R C W Henderson , E Hennekemper , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , A Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , H Peng , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , S Shushkevich , T Sloan , I Smiljanic , P Smirnov , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , I Tsurin , J Turnau , E Tzamariudaki , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , D Wegener , M Wessels , C Wissing , E Wunsch , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyan , F Zomer (2008) Multi-lepton production at high transverse momenta in ep collisions at HERA PHYSICS LETTERS B 668: 4. 268-276 OCT 16 Abstract: Processes leading to a final state with at least two high transverse momentum leptons (electrons or muons) are studied using the full e(+/-) p data sample collected by the H1 experiment at HERA. The data correspond to an integrated luminosity of 463 pb(-1). Di-lepton and tri-lepton event classes are investigated. Cross sections of the production of e(+)e(-) and mu(+)mu(-) pairs are derived in a restricted phase space dominated by photon-photon collisions. In general, good agreement is found with Standard Model predictions. Events are observed with a total scalar sum of lepton transverse momenta above 100 GeV where the Standard Model expectation is low. In this region, combining di-lepton and tri-lepton classes, five events are observed in e(+) p collisions, compared to a Standard Model expectation of 0.96 +/- 0.12, while no such event is observed in e(-) p data for 0.64 +/- 0.09 expected. (C) 2008 Elsevier B.V. All rights reserved.
Notes:
F D Aaron , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Bacchetta , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , M Beckingham , K Begzsuren , O Behnke , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dossanov , A Dubak , G Eckerlin , V Efremenko , S Egli , A Eliseev , E Elsen , S Essenov , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , A Fomenko , E Gabathuler , J Gayler , S Ghazaryan , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , K Knutsson , R Kogler , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , K Kutak , M P J Landon , W Langen , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , F Moreau , A Morozov , J V Morris , M U Mozer , M Mudrinic , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , O Pejchal , H Peng , E Perez , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , V Radescu , A J Rahmat , N Raicevic , A Raspiareza , T Ravdandorj , P Reimer , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , M Rotaru , J E R Tabasco , Z Rurikova , S Rusakov , D Salek , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoffel , A Schoening , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , S Shushkevich , T Sloan , I Smijanic , P Smirnov , Y Soloviev , P Sopicki , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , I Tsurin , J Turnau , E Tzamariudaki , K Urban , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , D Wegener , M Wessels , C Wissing , E Wunsch , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyan , F Zomer (2008) Search for excited electrons in ep collisions at HERA PHYSICS LETTERS B 666: 2. 131-139 AUG 14 Abstract: A search for excited electrons is performed using the full e(+/-) p data sample collected by the HI experiment at HERA, corresponding to a total luminosity of 475 pb(-1). The electroweak decays of excited electrons e* -> e gamma, e* -> eZ and e* -> vW with subsequent hadronic or leptonic decays of the W and Z bosons are considered. No evidence for excited electron production is found. Mass dependent exclusion limits on e* production cross sections and on the ratio f/Lambda of the coupling to the compositeness scale are derived within gauge mediated models. These limits extend the excluded region compared to previous excited electron searches. The e* production via contact interactions is also addressed for the first time in ep collisions. (C) 2008 Elsevier B.V. All rights reserved.
Notes:
2007
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , M Beckingham , K Begzsuren , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , G Flucke , A Fomenko , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , M Gouzevitch , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , G Heinzelmann , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Jacquet , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schatzel , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , I Smiljanic , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , A Stoilov , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , D Traynor , T N Trinh , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , K Wacker , G Weber , R Weber , D Wegener , C Werner , M Wessels , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2007) Tests of QCD factorisation in the diffractive production of dijets in deep-inelastic scattering and photoproduction at HERA EUROPEAN PHYSICAL JOURNAL C 51: 3. 549-568 AUG Abstract: Measurements are presented of differential dijet cross sections in diffractive photoproduction (Q(2) < 0.01 GeV2) and deep-inelastic scattering processes (DIS, 4 < Q2 < 80 GeV2). The event topology is given by ep -> eXY, in which the system X, containing at least two jets, is separated from a leading low-mass baryonic system Y by a large rapidity gap. The dijet cross sections are compared with NLO QCD predictions based on diffractive parton densities previously obtained from a QCD analysis of inclusive diffractive DIS cross sections by H1. In DIS, the dijet data are well described, supporting the validity of QCD factorisation. The diffractive DIS dijet data are more sensitive to the diffractive gluon density at high fractional parton momentum than the measurements of inclusive diffractive DIS. In photoproduction, the predicted dijet cross section has to be multiplied by a factor of approximately 0.5 for both direct and resolved photon interactions to describe the measurements. The ratio of measured dijet cross section to NLO prediction in photoproduction is a factor 0.5 +/- 0.1 smaller than the same ratio in DIS. This suppression is the first clear observation of QCD hard scattering factorisation breaking at HERA. The measurements are also compared to the two soft colour neutralisation models SCI and GAL. The SCI model describes diffractive dijet production in DIS but not in photoproduction. The GAL model fails in both kinematic regions.
Notes:
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , M Beckingham , K Begzsuren , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , G Flucke , A Fomenko , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , M Gouzevitch , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , G Heinzelmann , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D H Mann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Jacquet , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , T Papadopoulou , V Palichik , I Panagoulias , M Pandurovic , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoe , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , I Smiljanic , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , A Stoilov , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , D Traynor , T N Trinh , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , K Wacker , G Weber , R Weber , D Wegener , C Werner , M Wessels , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2007) Inclusive D*(+/-) meson and associated dijet production in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 51: 2. 271-287 JUL Abstract: Inclusive D*(+/-) production is measured in deep-inelastic ep scattering at HERA with the H1 detector. In addition, the production of dijets in events with a D*(+/-) meson is investigated. The analysis covers values of photon virtuality 2 <= Q(2) <= 100 GeV2 and of inelasticity 0.05 <= y <= 0.7. Differential cross sections are measured as a function of Q(2) and x and of various D*(+/-) meson and jet observables. Within the experimental and theoretical uncertainties all measured cross sections are found to be adequately described by next-to-leading order (NLO) QCD calculations, based on the photon - gluon fusion process and DGLAP evolution, without the need for an additional resolved component of the photon beyond what is included at NLO. A reasonable description of the data is also achieved by a prediction based on the CCFM evolution of partons involving the kT- unintegrated gluon distribution of the proton.
Notes:
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , M Beckingham , K Begzsuren , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , G Flucke , A Fomenko , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , M Gouzevitch , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , S Habib , D Haidt , M Hansson , G Heinzelmann , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Jacquet , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , L Lytkin , A Makankine , E Malinovski , P Marage , R Marshall , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , I Smiljanic , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , A Stoilov , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , D Traynor , T N Trinh , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , M Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , K Wacker , G Weber , R Weber , D Wegener , C Werner , M Wessels , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2007) Diffractive open charm production in deep-inelastic scattering and photoproduction at HERA EUROPEAN PHYSICAL JOURNAL C 50: 1. 1-20 MAR Abstract: Measurements are presented of diffractive open charm production at HERA. The event topology is given by ep -> eXY where the system X contains at least one charmed hadron and is well separated by a large rapidity gap from a leading low-mass proton remnant system Y. Two analysis techniques are used for the cross section measurements. In the first, the charm quark is tagged by the reconstruction of a D*(+/-)(2010) meson. This technique is used in deep-inelastic scattering (DIS) and photoproduction (gamma p). In the second, a method based on the displacement of tracks from the primary vertex is used to measure the open charm contribution to the inclusive diffractive cross section in DIS. The measurements are compared with next-to-leading order QCD predictions based on diffractive parton density functions previously obtained from a QCD analysis of the inclusive diffractive cross section at H1. A good agreement is observed in the full kinematic regime, which supports the validity of QCD factorization for open charm production in diffractive DIS and gamma p.
Notes:
A Aktas , C Alexa , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , M Beckingham , K Begzsuren , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , A Fomenko , G Franke , T Frisson , E Gabathuler , J Gayler , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , G Heinzelmann , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , A Knutsson , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Krueger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , L Lindfeld , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , P Prideaux , V Radescu , A J Rahmat , N Raicevic , T Ravdandorj , P Reimer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , I Smiljanic , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , J Stiewe , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , G Weber , R Weber , D Wegener , C Werner , M Wessels , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyan , F Zomer (2007) Measurement of inclusive jet production in deep-inelastic scattering at high Q(2) and determination of the strong coupling PHYSICS LETTERS B 653: 2-4. 134-144 SEP 30 Abstract: Inclusive jet production is studied in neutral current deep-inelastic positron-proton scattering at large four momentum transfer squared Q(2) > 150 GeV2 with the H1 detector at HERA. Single and double differential inclusive jet cross sections are measured as a function of Q(2) and of the transverse energy E-T of the jets in the Breit frame. The measurements are found to be well described by calculations at next-to-leading order in perturbative QCD. The running of the strong coupling is demonstrated and the value of alpha(s)(M-Z) is determined. The ratio of the inclusive jet cross section to the inclusive neutral current cross section is also measured and used to extract a precise value for ces (M-Z) = 0.1193 +/- 0.0014(exp.)(-0.0030)(+0.0047) (th.) +/- 0.0016(pdf). (c) 2007 Elsevier BX All rights reserved.
Notes:
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , M Beckingham , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , G Flucke , A Fomenko , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , S Habib , D Haidt , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , P Marage , R Marshall , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , A Stoilov , U Straumann , D Sunar , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , D Traynor , T N Trinh , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , M Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , S Vinokurova , V Volchinski , K Wacker , G Weber , R Weber , D Wegener , C Werner , M Wessels , B Wessling , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2007) Inclusive D-*+/- meson cross sections and D-*+/--jet correlations in photoproduction at HERA EUROPEAN PHYSICAL JOURNAL C 50: 2. 251-267 APR Abstract: Differential photoproduction cross sections are measured for events containing D-*+/- mesons. The data were taken with the H1 detector at the ep collider HERA and correspond to an integrated luminosity of 51.1 pb(-1). The kinematic region covers small photon virtualities Q(2) < 0.01 GeV2 and photon-proton centre-of-mass energies of 171 < W gamma(Cep) < 256 GeV. The details of the heavy quark production process are further investigated in events with one or two jets in addition to the D-*+/- meson. Differential cross sections for D-* + jet production are determined and the correlations between the D-*+/- meson and the jet(s) are studied. The results are compared with perturbative QCD predictions applying collinear- or k(t)-factorisation.
Notes:
A Aktas , C Alexa , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , M Beckingham , K Begzsuren , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , A Fomenko , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , M Gouzevitch , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , G Heinzelmann , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Povh , T Preda , P Prideaux , A J Rahmat , N Raicevic , T Ravdandorj , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , I Smiljanic , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , K Wacker , G Weber , R Weber , D Wegener , C Werner , M Wessels , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2007) Search for lepton flavour violation in ep collisions at HERA EUROPEAN PHYSICAL JOURNAL C 52: 4. 833-847 DEC Abstract: A search for the lepton flavour violating processes ep -> mu X and ep -> tau X is performed with the H1 experiment at HERA. Final states with a muon or tau and a hadronic jet are searched for in a data sample corresponding to an integrated luminosity of 66.5 pb(-1) for e(+) p collisions and 13.7 pb(-1) for e(-)p collisions at acentre-of-mass energy of 319 GeV. No evidence for lepton flavour violation is found. Limits are derived on the mass and the couplings of leptoquarks inducing lepton flavour violation in an extension of the Buchmuller-Ruckl-Wyler effective model. Leptoquarks produced in ep collisions with a coupling strength of lambda = 0.3 and decaying with the same coupling strength to a muon-quark pair or a tau-quark pair are excluded at 95% confidence level up to masses of 459 GeV and 379 GeV, respectively.
Notes:
A Aktas , C Alexa , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , M Beckingham , K Begzsuren , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B Cantunavila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Deldegan , J Delvax , A De Roeck , E A Dewolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Faulkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , A Fomenko , G Franke , T Frisson , E Gabathuler , J Gayler , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , G Heinzelmann , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hormann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , A Knutsson , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , L Lindfeld , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I MIlcewicz-Mika , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , P Prideaux , V Radescu , A J Rahmat , N Raicevic , T Ravdandorj , P Reimer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoerel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , I Smiljanic , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , J Stiewe , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , D Utkin , A Valkarova , C Vallee , P Vanmechelen , A Vargastrevino , Y Vazdik , S Vinokurova , V Volchinski , G Weber , R Weber , D Wegener , C Werner , M Wessels , C Wissing , R Wolf , E Wunsch , S Xella , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyanand , F Zomer (2007) Dijet cross sections and parton densities in diffractive DIS at HERA JOURNAL OF HIGH ENERGY PHYSICS 10. OCT Abstract: Differential dijet crosssections in dirractive deep-in elastic scattering are measured with the H1 detector at HERA using an integrated luminosity of 51.5 pb(-1).The selected events are of the type ep -> eXY, where the system X contains atleast two jets and is well separated in rapidity from the low mass proton dissociation system Y.The dijet data are compared with QCD predictions at next-to-leading order based on diffractive part on distribution unctions previously extracted from measurement so inclusive dirractive deep-inelastic scattering.The prediction describes the dijet data well at low and intermediate z(P)(the fraction of the momentum of the dirractive exchange carried by the part on entering the hard interaction)where the gluon density is well determinedfromtheinclusivedirractive data,supporting QCD factorisation. A new set of dirractive part on distribution functions is obtained through a simultaneous fit to the dirractive inclusive and dijet crosssections.This allows for a precise determination of both the dirractive quark and gluon distributions in the range 0.05<z(P)<0.9.In particular,the precision on the gluon density at high momentum fractions is improved compared to previous extractions.
Notes:
A Aktas , C Alexa , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , M Beckingham , K Begzsuren , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , A Fomenko , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , M Gouzevitch , C Grab , T Greenshaw , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , G Heinzelmann , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , A Knutsson , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , B Povh , T Preda , P Prideaux , A J Rahmat , N Raicevic , T Ravdandorj , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , I Smiljanic , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , J Stiewe , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , G Weber , R Weber , D Wegener , C Werner , M Wessels , C Wissing , R Wolf , E Wunsch , S Xella , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyan , F Zomer (2007) Search for baryonic resonances decaying to Xi pi in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 52: 3. 507-514 NOV Abstract: A search for narrow baryonic resonances decaying into Xi(-)pi(-) or Xi(-)pi(+) and their antiparticles is carried out with the H1 detector using deep inelastic scattering events at HERA in the range of negative photon four-momentum transfer squared 2<Q(2)< 100 GeV2. No signal is observed for a new baryonic state in the mass range 1600-2300 MeV in either the doubly charged or the neutral decay channels. The known.( 1530) 0 is observed through its decay mode into Xi(-)pi(+). Upper limits are given on the ratio of the production rates of new baryonic states, such as the hypothetical pentaquark states Xi(--)(5q) or Xi(0)(5q), relative to the Xi(1530)(0) baryon state.
Notes:
F D Aaron , A Aktas , C Alexa , V Andreev , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , M Beckingham , K Begzsuren , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , I Bozovic-Jelisavcic , J Bracinik , G Brandt , M Brinkmann , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , K B C Avila , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , A Cholewa , J G Contreras , J A Coughlan , G Cozzika , J Cvach , J B Dainton , K Daum , M Deak , Y de Boer , B Delcourt , M Del Degan , J Delvax , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkiewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , A Fomenko , G Franke , T Frisson , E Gabathuler , J Gayler , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , M Gouzevitch , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , S Habib , D Haidt , M Hansson , G Heinzelmann , C Helebrant , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Jacquet , M E Janssen , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , A Knutsson , V Korbel , P Kostka , M Kraemer , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , G Li , L Lindfeld , K Lipka , A Liptaj , B List , J List , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , L Lytkin , A Makankine , E Malinovski , P Marage , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , M Pandurovic , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , I Picuric , S Piec , D Pitzl , R Placakyte , R Polifka , B Povh , T Preda , P Prideaux , V Radescu , A J Rahmat , N Raicevic , T Ravdandorj , P Reimer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , D Salek , F Salvaire , D P C Sankey , M Sauter , E Sauvan , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , I Smijanic , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , Z Staykova , M Steder , B Stella , J Stiewe , U Straumann , D Sunar , T Sykora , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , T H Tran , D Traynor , T N Trinh , P Truol , I Tsakov , B Tseepeldorj , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , S Vinokurova , V Volchinski , G Weber , R Weber , D Wegener , C Werner , M Wessels , C Wissing , R Wolf , E Wunsch , S Xella , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , T Zimmermann , H Zohrabyan , F Zomer (2007) Charged particle production in high Q(2) deep-inelastic scattering at HERA PHYSICS LETTERS B 654: 5-6. 148-159 OCT 18 Abstract: The average charged track multiplicity and the normalised distribution of the scaled momentum, x(p), of charged final state hadrons are measured in deep-inelastic ep scattering at high Q(2) in the Breit frame of reference. The analysis covers the range of photon virtuality 100 < Q(2) < 20000 GeV2. Compared with previous results presented by HERA experiments this analysis has a significantly higher statistical precision and extends the phase space to higher Q(2) and to the full range of x(p). The results are compared with e(+)e(-) annihilation data and with various calculations based on perturbative QCD using different models of the hadronisation process. (c) 2007 Published by Elsevier B.V.
Notes:
2006
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dan , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , K Desch , E A De Wow , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Elsen , W Erdmann , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , P Fleischmann , G Flucke , A Fomenko , I Foresti , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , J Kuckens , M P J Landon , W Lange , T Lastovicka , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , K Sedlak , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , I Strauch , U Straumann , D Sunar , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , M Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , S Vinokurova , V Volchinski , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , M Wessels , B Wessling , C Wigmore , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) Measurement of event shape variables in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 46: 2. 343-356 MAY Abstract: Deep-inelastic ep scattering data taken with the H1 detector at HERA and corresponding to an integrated luminosity of 106 pb(-1) are used to study the differential distributions of event shape variables. These include thrust, jet broadening, jet mass and the C-parameter. The four-momentum transfer Q is taken to be the relevant energy scale and ranges between 14 GeV and 200 GeV. The event shape distributions are compared with perturbative QCD predictions, which include resummed contributions and analytical power law corrections, the latter accounting for non-perturbative hadronisation effects. The data clearly exhibit the running of the strong coupling alpha(s)(Q) and are consistent with a universal power correction parameter alpha(0) for all event shape variables. A combined QCD fit using all event shape variables yields alpha(s)(m(Z)) = 0.1198 +/- 0.0013 (+0.0056)(-0.0043) and alpha(0) = 0.476 +/- 0.008 (+0.018)(-0.059).
Notes:
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D Bruncko , F W Buesser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton' , W D Dau , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , K Desch , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , W Erdmann , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , L Finke , M Fleischer , P Fleischmann , G Flucke , A Fomenko , I Foresti , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Krueger , J Kueckens , M P J Landon , W Lange , T Lastovicka , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B Listo , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Mueller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , M Peez , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , F P Schilling , D Schmidt , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoening , H C Schultz-Coulon , K Sedlak , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , M Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , M Wessels , B Wessling , C Wigmore , C Wissing , R Wolf , E Wuensch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) Elastic J/psi production at HERA EUROPEAN PHYSICAL JOURNAL C 46: 3. 585-603 JUN Abstract: Cross sections for elastic production of J/psi mesons in photoproduction and electroproduction are measured in electron proton collisions at HERA using an integrated luminosity of 55 pb(-1). Results are presented for photon virtualities Q(2) up to 80 GeV2. The dependence on the photon-proton centre of mass energy W-gamma p is analysed in the range 40 <= W-gamma p <= 305 GeV in photoproduction and 40 <= W-gamma p <= 160 GeV in electroproduction. The W-gamma p dependences of the cross sections do not change significantly with Q(2) and can be described by models based on perturbative QCD. Within such models, the data show a high sensitivity to the gluon density of the proton in the domain of low Bjorken x and low Q(2). Differential cross sections d sigma/dt, where t is the squared four-momentum transfer at the proton vertex, are measured in the range vertical bar t vertical bar < 1.2 GeV2 as functions of W-gamma p and Q(2). Effective Pomeron trajectories are determined for photoproduction and electroproduction. The J/psi production and decay angular distributions are consistent with s-channel helicity conservation. The ratio of the cross sections for longitudinally and transversely polarised photons is measured as a function of Q(2) and is found to be described by perturbative QCD based models.
Notes:
A Aktas , V Andreev , T Anthonis , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , A De Roeck , K Desch , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , W Erdmann , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , L Finke , M Fleischer , P Fleischmann , G Flucke , A Fomenko , I Foresti , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyans , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , J Kuckens , M P J Landon , W Lange , T Lastovicka , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , M Peez , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , F P Schilling , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , K Sedlak , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , B Vujicic , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , M Wessels , B Wessling , C Wigmore , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) Forward jet production in deep inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 46: 1. 27-42 APR Abstract: The production of forward jets has been measured in deep inelastic ep collisions at HERA. The results are presented in terms of single differential cross sections as a function of the Bjorken scaling variable (xB(j)) and as triple differential cross sections d3 sigma/dx(Bj)dQ(2)dp(t)(,jet)(2), where Q(2) is the four momentum transfer squared and p(t)(,iet)(2) is the squared transverse momentum of the forward jet. Also cross sections for events with a di-jet system in addition to the forward jet are measured as a function of the rapidity separation between the forward jet and the two additional jets. The measurements are compared with next-to-leading order QCD calculations and with the predictions of various QCD-based models.
Notes:
A Aktas , V Andreev , T Anthonis , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D P Brown , D Bruncko , F W Buesser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , A De Roeck , K Desch , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , W Erdmann , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , L Finke , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , A Fomenko , I Foresti , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , N Keller , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , J Kuckens , M P J Landon , W Lange , T Lastovicka , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , M Peez , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , P C Sankey , E Sauvan , S Schatzel , F P Schilling , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , K Sedlak , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , B Vujicic , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , C Wigmore , C Wissing , R Wolf , E Wuensch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) Measurement of Fc(c)over-bar(2) and Fb(b)over-bar(2) at low Q(2) and x using the H1 vertex detector at HERA EUROPEAN PHYSICAL JOURNAL C 45: 1. 23-33 JAN Abstract: Measurements are presented of inclusive charm and beauty cross sections in e(+)p collisions at HERA for values of photon virtuality 12 <= Q(2) = 60 GeV2 and of the Bjorken scaling variable 0.0002 <= x <= 0.005. The fractions of events containing charm and beauty quarks are determined using a method based on the impact parameter, in the transverse plane, of tracks to the primary vertex, as measured by the H1 vertex detector. Values for the structure functions F-2(cc) and F-2(bb) are obtained. This is the first measurement of F-2(bb) in this kinematic range. The results are found to be compatible with the predictions of perturbative quantum chromodynamics and with previous measurements of F-2(cc).
Notes:
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , P Fleischmann , G Flucke , A Fomenko , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , T Lastovicka , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Linfield , K Lipka , A Liptaj , B List , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Lueke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , R Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Nozicka , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R R Placakyte , B Portheault , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , U Straumann , D Sunar , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , M Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , S Vinokurova , V Volchinski , K Wacker , G Weber , R Weber , D Wegener , C Werner , M Wessels , B Wessling , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) Diffractive photoproduction of rho mesons with large momentum transfer at HERA PHYSICS LETTERS B 638: 5-6. 422-431 JUL 20 Abstract: The diffractive photoproduction of rho mesons, ep -> e rho Y, with large momentum transfer squared at the proton vertex, vertical bar t vertical bar, is studied with the H1 detector at HERA using an integrated luminosity of 20.1 pb(-1). The photon-proton centre of mass energy spans the range 75 < W < 95 GeV, the photon virtuality is restricted to Q(2) < 0.01 GeV2 and the mass My of the proton remnant is below 5 GeV. The t dependence of the cross section is measured for the range 1.5 < vertical bar t vertical bar < 10.0 GeV2 and is well described by a power law, d sigma/d vertical bar t vertical bar proportional to vertical bar t vertical bar(-n). The spin density matrix elements, which provide information on the helicity structure of the interaction, are extracted using measurements of angular distributions of the rho decay products. The data indicate a violation of s-channel helicity conservation, with contributions from both single and double helicity-flip being observed. The results are compared to the predictions of perturbative QCD models. (c) 2006 Elsevier B.V. All rights reserved.
Notes:
A Aktas , V Andreev , T Anthonis , S Aplini , A Asmone , A Astvatsatourov , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , A De Roeck , K Desch , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , W Erdmann , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , L Finke , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , A Fomenko , I Foresti , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , N Keller , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , J Kuckens , M P J Landon , W Lange , T Lastovicka , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , M Peez , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , F P Schilling , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , K Sedlak , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , B Vujicic , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , C Wigmore , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) A determination of electroweak parameters at HERA PHYSICS LETTERS B 632: 1. 35-42 JAN 5 Abstract: Using the deep inelastic e(+) p and e(-) p charged and neutral current scattering cross sections previously published, a combined electroweak and QCD analysis is performed to determine electroweak parameters accounting for their correlation with parton distributions. The data used have been collected by the HI experiment in 1994-2000 and correspond to an integrated luminosity of 117.2 pb(-1). A measurement is obtained of the W propagator mass in charged current ep scattering. The weak mixing angle sin(2)theta w is determined in the on-mass-shell renormalisation scheme. A first measurement at HERA is made of the light quark weak couplings to the Z(0) boson and a possible contribution of right-handed isospin components to the weak couplings is investigated. (c) 2005 Elsevier B.V. All rights reserved.
Notes:
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , K Desch , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , E Eisele , E Elsen , W Erdmann , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , J Feltesse , J Ferencei , L Finke , M Fleischer , P Fleischmann , G Flucke , A Fomenko , I Foresti , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , J Kuckens , M P J Landon , W Lange , T Lastovicka , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , E Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , B Reisert , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , K Sedlak , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , I Strauch , U Straumann , D Sunar , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , M Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , S Vinokurova , V Volchinski , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , M Wessels , B Wessling , C Wigmore , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) First measurement of charged current cross sections at HERA with longitudinally polarised positrons PHYSICS LETTERS B 634: 2-3. 173-179 MAR 9 Abstract: Data taken with positrons of different longitudinal polarisation states in collision with unpolarised protons at HERA are used to measure the total cross sections of the charged current process, e(+) p -> nu X, for negative four-momentum transfer squared Q(2) > 400 GeV2 and inelasticity gamma < 0.9. Together with the corresponding cross section obtained from the previously published unpolarised data, the polarisation dependence of the charged current cross section is measured for the first time at high Q(2) and found to be in agreement with the Standard Model prediction. (c) 2006 Elsevier B.V. All rights reserved.
Notes:
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , M Beckingham , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , Y R Coppens , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , G Flucke , A Fomenko , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , X Janssen , V Jemanov , L Jonsson , C L Johnson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , P Marage , R Marshall , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , M Sauter , E Sauvan , F P Schilling , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , A Stoilov , U Straumann , D Sunar , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , D Traynor , T N Trinh , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , M Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , S Vinokurova , V Volchinski , K Wacker , G Weber , R Weber , D Wegener , C Werner , M Wessels , B Wessling , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) Diffractive deep-inelastic scattering with a leading proton at HERA EUROPEAN PHYSICAL JOURNAL C 48: 3. 749-766 DEC Abstract: The cross section for the diffractive deep-inelastic scattering process ep -> eX(P) is measured, with the leading final state proton detected in the H1 Forward Proton Spectrometer. The data analysed cover the range x(P) < 0.1 in fractional proton longitudinal momentum loss, 0.08 < vertical bar t vertical bar < 0.5 GeV-2 in squared four-momentum transfer at the proton vertex, 2 < Q(2) < 50 GeV2 in photon virtuality and 0.004 < beta = x/x(P) < 1, where x is the Bjorken scaling variable. For x(P) less than or similar to 10(-2), the differential cross section has a dependence of approximately d sigma/dt proportional to e(6t), independently of x(P), beta and Q(2) within uncertainties. The cross section is also measured triple differentially in x(P), beta and Q(2). The x(P) dependence is interpreted in terms of an effective pomeron trajectory with intercept alpha(P) (0) = 1.114 +/- 0.018(stat.) +/- 0.012(syst.)(-0.020)(+0.040) (model) and a subleading exchange. The data are in good agreement with an H1 measurement for which the event selection is based on a large gap in the rapidity distribution of the final state hadrons, after accounting for proton dissociation contributions in the latter. Within uncertainties, the dependence of the cross section on x and Q(2) can thus be factorised from the dependences on all studied variables which characterise the proton vertex, for both the pomeron and the sub-leading exchange.
Notes:
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , G Flucke , A Fomenko , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , A Stoilov , U Straumann , D Sunar , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , M Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , S Vinokurova , V Volchinski , K Wacker , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) Tau lepton production in ep collisions at HERA EUROPEAN PHYSICAL JOURNAL C 48: 3. 699-714 DEC Abstract: The production of tau leptons in ep collisions is investigated using data recorded by the H1 detector at HERA in the period 1994-2000. Tau leptons are identified by detecting their decay products, using leptonic and hadronic decay modes. The cross section for the production of tau lepton pairs is measured for the first time at HERA. Furthermore, a search for events with an energetic isolated tau lepton and with large missing transverse momentum is performed. The results are found to be in agreement with the Standard Model predictions.
Notes:
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Eisen , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , G Flucke , A Fomenko , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Scatzel , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , E Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smimov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , A Stoilov , U Straumann , D Sunar , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , M Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , S Vinokurova , V Volchinski , K Wacker , G Weber , R Weber , D Wegener , C Werner , M Wessels , B Wessling , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) Search for doubly-charged Higgs boson production at HERA PHYSICS LETTERS B 638: 5-6. 432-440 JUL 20 Abstract: A search for the single production of doubly-charged Higgs bosons H-+/-+/- in ep collisions is presented. The signal is searched for via the Higgs decays into a high mass pair of same charge leptons, one of them being an electron. The analysis uses up to 118 pb(-1) of ep data collected by the H1 experiment at HERA. No evidence for doubly-charged Higgs production is observed and mass dependent upper limits are derived on the Yukawa couplings h(el) of the Higgs boson to an electron-lepton pair. Assuming that the doubly-charged Higgs only decays into an electron and a muon via a coupling of electromagnetic strength h(e mu) = root 4 pi alpha(em) similar or equal to 0.3, a lower limit of 141 GeV on the H-+/-+/- mass is obtained at the 95% confidence level. For a doubly-charged Higgs decaying only into an electron and a tau and a coupling h(e tau) similar or equal to 0.3, masses below 112 GeV are ruled out. (c) 2006 Elsevier B.V. All rights reserved.
Notes:
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dan , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finkelo , M Fleischer , G Flucke , A Fomenko , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , A Stoilov , U Straumann , D Sunar , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , M Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , S Vinokurova , V Volchinski , K Wacker , G Weber , R Weber , D Wegener , C Werner , M Wessels , B Wessling , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) Measurement of charm and beauty dijet cross sections in photoproduction at HERA using the H1 vertex detector EUROPEAN PHYSICAL JOURNAL C 47: 3. 597-610 SEP Abstract: A measurement of charm and beauty dijet photoproduction cross sections at the ep collider HERA is presented. Events are selected with two or more jets of transverse momentum Pt > 11(8) GeV in the central range of pseudo-rapidity -0.9 <eta (jet1(2))< 1.3. The fractions of events containing charm and beauty quarks are determined using a method based on the impact parameter, in the transverse plane, of tracks to the primary vertex, as measured by the HI central vertex detector. Differential dijet cross sections for charm and beauty, and their relative contributions to the flavour inclusive dijet photoproduction cross section, are measured as a function of the transverse momentum of the leading jet, the average pseudorapidity of the two jets and the observable chi(obs)(gamma). Taking into account the theoretical uncertainties, the charm cross sections are consistent with a QCD calculation in next-to-leading order, while the predicted cross sections for beauty production are somewhat lower than the measurement.
Notes:
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , M Beckingham , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , Y R Coppens , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , G Flucke , A Fomenko , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , X Janssen , V Jemanov , L Jonsson , C L Johnson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , P Marage , R Marshall , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , M Sauter , E Sauvan , F P Schilling , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , A Stoilov , U Straumann , D Sunar , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , D Traynor , T N Trinh , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , M Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , S Vinokurova , V Volchinski , K Wacker , G Weber , R Weber , D Wegener , C Werner , M Wessels , B Wessling , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) Measurement and QCD analysis of the diffractive deep-inelastic scattering cross section at HERA EUROPEAN PHYSICAL JOURNAL C 48: 3. 715-748 DEC Abstract: A detailed analysis is presented of the diffractive deep-inelastic scattering process ep -> eXY, where Y is a proton or a low mass proton excitation carrying a fraction 1 - x(IP) > 0.95 of the incident proton longitudinal momentum and the squared four-momentum transfer at the proton vertex satisfies |t| < 1 GeV2. Using data taken by the H1 experiment, the cross section is measured for photon virtualities in the range 3.5 <= Q(2) <= 1600 GeV2, triple differentially in x(IP), Q(2) and beta = x/x(P), where x is the Bjorken scaling variable. At low x(IP), the data are consistent with a factorisable x(IP) dependence, which can be described by the exchange of an effective pomeron trajectory with intercept alpha(IP)(0) = 1.118 +/- 0.008(exp.)(-0.010)(+0.029)(model). Diffractive parton distribution functions and their uncertainties are determined from a next-to-leading order DGLAP QCD analysis of the Q(2)and beta dependences of the cross section. The resulting gluon distribution carries an integrated fraction of around 70% of the exchanged momentum in the Q(2) range studied. Total and differential cross sections are also measured for the diffractive charged current process e(+) p -> (v) over bar eXY and are found to be well described by predictions based on the diffractive parton distributions. The ratio of the diffractive to the inclusive neutral current ep cross sections is studied. Over most of the kinematic range, this ratio shows no significant dependence on Q(2) at fixed x(P) and x or on x at fixed Q(2) and beta.
Notes:
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Eliseev , E Elsen , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , G Flucke , A Fomenko , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , M P J Landon , W Lange , G Lastovicka-Medin , R Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , L Marti , M Martisikova , H U Martyn , S J Maxfield , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , K Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , A Stoilov , U Straumann , D Sunar , V Tchoulakov , G Thompson , P D Thompson , T Toll , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , M Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , S Vinokurova , V Volchinski , K Wacker , G Weber , R Weber , D Wegener , C Werner , M Wessels , B Wessling , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) Search for a narrow baryonic resonance decaying to K(s)(0)p or K-s(0)(p)over-bar in deep inelastic scattering at HERA PHYSICS LETTERS B 639: 3-4. 202-209 AUG 10 Abstract: A search for a narrow baryonic resonance decaying to K(s)(0)p or K-s(0)(p) over bar is carried out in deep inelastic ep scattering with the H1 detector at HERA. ss Such a resonance could be a strange pentaquark Theta(+), evidence for which has been reported by several experiments. The K(s)(0)p and K-s(0)(p) over bar invariant ss mass distributions presented here do not show any significant peak in the mass range from threshold up to 1.7 GeV. Mass dependent upper limits on sigma(ep -> e Theta X+) x BR(Theta(+) -> K(0)p) are obtained at the 95% confidence level. (c) 2006 Published by Elsevier B.V.
Notes:
A Aktas , V Andreev , T Anthonis , B Antunovic , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , M Del Degan , A De Roeck , K Desch , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Elsen , W Erdmann , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , L Finke , M Fleischer , P Fleischmann , G Flucke , A Fomenko , I Foresti , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , S Hussain , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , J Kuckens , M P J Landon , W Lange , T Lastovicka , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , J List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , V Michels , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , H Peng , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , A J Rahmat , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , H C Schultz-Coulon , K Sedlak , F Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , M Steder , B Stella , J Stiewe , I Strauch , U Straumann , D Sunar , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , K Urban , A Urban , A Usik , D Utkin , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , S Vinokurova , V Volchinski , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , M Wessels , B Wessling , C Wigmore , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2006) Photoproduction of dijets with high transverse momenta at HERA PHYSICS LETTERS B 639: 1. 21-31 JUL 27 Abstract: Differential dijet cross sections are measured in photoproduction in the region of photon virtualities Q(2) < 1 GeV2 with the H1 detector at the HERA ep collider using an integrated luminosity of 66.6 pb(-1). Jets are defined with the inclusive k perpendicular to algorithm and a minimum transverse momentum of the leading jet of 25 GeV is required. Dijet cross sections are measured indirect and resolved photon enhanced regions separately. Longitudinal proton momentum fractions up to 0.7 are reached. The data compare well with predictions from Monte Carlo event generators based on leading order QCD and parton showers and with next-to-leading order QCD calculations corrected for hadronisation effects. (c) 2006 Elsevier B.V. All rights reserved.
Notes:
2005
A Aktas , V Andreev , T Anthonis , S Aplin , A Asmone , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , W Erdmann , S Essenov , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , L Finke , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , T Frisson , E Gabathuler , E Garutti , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , T Greenshaw , M Gregori , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , I Herynek , R D Heuer , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , M Kapichine , M Karlsson , J Katzy , N Keller , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , R Koutouev , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , J Kuckens , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , D Milstead , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , R Poschl , B Portheault , B Povh , P Prideaux , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , N Van Remortel , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , B Vujicic , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , C Wigmore , G G Winter , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , J Zimmermann , H Zohrabyan , F Zomer (2005) A direct search for stable magnetic monopoles produced in positron-proton collisions at HERA EUROPEAN PHYSICAL JOURNAL C 41: 2. 133-141 MAY Abstract: A direct search has been made for magnetic monopoles produced in e(+)p collisions at a centre of mass energy of 300 GeV at HERA. The beam pipe surrounding the interaction region in 1995-1997 was investigated using a SQUID magnetometer to look for stopped magnetic monopoles. During this time an integrated luminosity of 62 pb(-1) was delivered. No magnetic monopoles were observed and charge and mass dependent upper limits on the e(+)p production cross section are set.
Notes:
A Aktas , V Andreev , T Anthonis , S Aplin , A Asmone , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , J G Contreras , Y R Coppens , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , W Erdmann , S Essenov , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , L Finke , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , T Frisson , E Gabathuler , K Gabathuler , E Garutti , J Garvey , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , H Grassler , T Greenshaw , M Gregori , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , I Herynek , R D Heuer , M Hildebrandt , K H Hiller , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , N Keller , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , K K Kruger , J Kuckens , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , D Milstead , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , V Nagovizin , K Nankov , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , R Poschl , B Portheault , B Povh , P Prideaux , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , S Schmidt , S Schmitt , C Schmitz , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , A Uraev , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , N Van Remortel , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , B Vujicic , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , C Wigmore , G G Winter , C Wissing , Z Zhang , E Woehrling , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , A Zhelezov , A Zhokin , J Zimmermann , H Zohrabyan , F Zomer (2005) Measurement of F-2(c(c)over-bar) and F-2(b(b)over-bar) at high Q(2) using the H1 vertex detector at HERA EUROPEAN PHYSICAL JOURNAL C 40: 3. 349-359 APR Abstract: Measurements are presented of inclusive charm and beauty cross sections in e(+)p collisions at HERA for values of photon virtuality Q(2) > 150 GeV2 and of inelasticity 0.1 < y < 0.7. The charm and beauty fractions are determined using a method based on the impact parameter, in the transverse plane, of tracks to the primary vertex, as measured by the H1 vertex detector. The data are divided into four regions in Q(2) and Bjorken x, and values for the structure functions F-2(c (c) over bar) and F-2(b (b) over bar) are obtained. The results are found to be compatible with the predictions of perturbative quantum chromodynamics.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , C Collard , J G Contreras , Y R Coppens , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , E Garutti , J Garvey , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , S Gorbounov , C Grab , H Grassler , T Greenshaw , M Gregori , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , R D Heuer , M Hildebrandt , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , G Knies , A Knutsson , B Koblitz , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , J Kuckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , I Milcewicz-Mika , D Milstead , A Mohamed , F Moreau , A Morozov , I Morozov , J V Morris , M U Mozer , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , E Olsson , G Ossoskov , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , R Poschl , B Portheault , B Povh , N Raicevic , Z Ratiani , P Reimer , B Reisert , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , A Uraev , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , G G Winter , C Wissing , E E Woehrling , R Wolf , E Wunsch , S Xella , W Yan , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2005) Measurement of prompt photon cross sections in photoproduction at HERA EUROPEAN PHYSICAL JOURNAL C 38: 4. 437-445 JAN Abstract: Results are presented on the photoproduction of isolated prompt photons, inclusively and associated with jets, in the gammap center of mass energy range 142 < W < 266 GeV. The cross sections are measured for the transverse momentum range of the photons 5 < E. T < 10 GeV and for associated jets with E-T(jet) > 4.5 GeV. They are measured differentially as a function of E-T(gamma), E-T(jet), the pseudorapidities eta(gamma) and eta(jet) and estimators of the momentum fractions x(gamma) and x(p) of the incident photon and proton carried by the constituents participating in the hard process. In order to further investigate the underlying dynamics, the angular correlation between the prompt photon and the jet in the transverse plane is studied. Predictions by perturbative QCD calculations in next to leading order are about 30% below the inclusive prompt photon data after corrections for hadronisation and multiple interactions, but are in reasonable agreement with the results for prompt photons associated with jets. Comparisons with the predictions of the event generators PYTHIA and HERWIG are also presented.
Notes:
A Aktas , V Andreev , T Anthonis , S Aplin , A Asmone , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , R Demirchyan , A DeRoeck , K Desch , E A DeWolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , W Erdmann , S Essenov , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , L Finke , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , A Fomenko , I Foresti , A Formanek , G Franke , G Frising , T Frisson , E Gabathuler , E Garutti , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , T Greenshaw , M Gregori , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , I Herynek , R D Heuer , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , M Kapichine , M Karlsson , J Katzy , N Keller , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , R Koutouev , K Krastev , J Kretzschmar , A Kropivnitskaya , K K Kruger , J K Kuckens , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , I Milcewicz-Mika , D Milstead , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , R Poschl , B Portheault , B Povh , P Prideaux , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , S Schmidt , C Schmitz , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , N Van Remortel , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , B Vujicic , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , C Wigmore , G G Winter , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , J Zimmermann , H Zohrabyan , F Zomer (2005) Measurement of dijet cross sections in ep interactions with a leading neutron at HERA EUROPEAN PHYSICAL JOURNAL C 41: 3. 273-286 JUN Abstract: Measurements are reported of the production of dijet events with a leading neutron in ep interactions at HERA. Differential cross sections for photoproduction and deep inelastic scattering are presented as a function of several kinematic variables. Leading order QCD simulation programs are compared with the measurements. Models in which the real or virtual photon interacts with a parton of an exchanged pion are able to describe the data. Next-to-leading order perturbative QCD calculations based on pion exchange are found to be in good agreement with the measured cross sections. The fraction of leading neutron dijet events with respect to all dijet events is also determined. The dijet events with a leading neutron have a lower fraction of resolved photon processes than do the inclusive dijet data.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , C Collard , J G Contreras , Y R Coppens , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , E Garutti , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , S Gorbounov , C Grab , H Grassler , J Graves , T Greenshaw , M Gregori , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , R D Heuer , M Hildebrandt , K H Hiller , P Hoting , D Hoffman , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L J Onsson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , B Koblitz , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , T Kuckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , I Milcewicz-Mika , D Milstead , A Mohamed , F Moreau , A Morozov , I Morozov , J V Morris , M U Mozer , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , G Ossoskov , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , R Poschl , B Portheault , B Povh , N Raicevic , Z Ratiani , P Reimer , B Reisert , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , S Schmidt , S Schmitt , M Schneebeli , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , A Uraev , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , N Van Remortel , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , G G Winter , C Wissing , E E Woehrling , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2005) Inclusive production of D+, D-0, D-s(+) and D*(+) mesons in deep inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 38: 4. 447-459 JAN Abstract: Inclusive production cross sections are measured in deep inelastic scattering at HERA for meson states composed of a charm quark and a light antiquark or the charge conjugate. The measurements cover the kinematic region of photon virtuality 2 < Q(2) < 100 GeV2, inelasticity 0.05 < y < 0.7, D meson transverse momenta p(t)( D) greater than or equal to 2.5 GeV and pseudorapidity |eta( D)| less than or equal to 1.5. The identification of the D-meson decays and the reduction of the combinatorial background profit from the reconstruction of displaced secondary vertices by means of the H1 silicon vertex detector. The production of charmed mesons containing the light quarks u, d and s is found to be compatible with a description in which the hard scattering is followed by a factorisable and universal hadronisation process.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , J G Contreras , Y R Coppens , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , E Garutti , J Garvey , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , S Ginzburgskaya , L Goerlich , N Gogitidze , S Gorbounov , C Grab , H Grassler , T Greenshaw , M Gregori , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , I Herynek , R D Heuer , M Hildebrandt , K H Hiller , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , N Keller , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , B Koblitz , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , K Kruger , J Kuckens , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , D Milstead , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , V Nagovizin , K Nankov , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , D Ozerov , A Paramonov , C Pascaud , G D Patel , M Peez , E Perez , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , R Poschl , B Portheault , B Povh , N Raicevic , P Reimer , B Reisert , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , R P Schilling , P Schleper , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , E Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , A Uraev , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , N Van Remortel , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , G G Winter , C Wissing , E E Woehrling , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , H Zohrabyan , F Zomer (2005) Search for light gravitinos in events with photons and missing transverse momentum at HERA PHYSICS LETTERS B 616: 1-2. 31-42 JUN 9 Abstract: A search for gravitinos produced in e(+/-)p collisions is performed using the H1 detector at HERA. The data were taken at a centre-of-mass energy of 319 GeV and correspond to an integrated luminosity of 64.3 pb(-1) for e(+)p collisions and 13.5 pb(-1) for e(-)p collisions. If R-parity is not conserved, the t-channel exchange of a selectron can produce a neutralino, which, in models where the gravitino is the lightest supersymmetric particle, subsequently decays into a photon and a light gravitino. The resulting event signature, which involves an isolated photon, a jet and missing transverse energy, is analysed for the first time at HERA. No deviation from the Standard Model is found. Exclusion limits on the cross section and on R-parity-violating Yukawa couplings are derived in a Gauge Mediated Supersymmetry Breaking scenario. The results are independent of the squark sector. Neutralinos and supersymmetric partners of the left-handed electron with masses up to 112 GeV and 164 GeV, respectively, can be ruled out at the 95% confidence level for R-parity-violating couplings lambda' equal to 1, in some parts of the parameter space of the considered model. (c) 2005 Elsevier B.V. All rights reserved.
Notes:
A Aktas , V Andreev , T Anthonis , S Aplin , A Asmone , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunnner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , W Erdmann , S Essenov , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , L Finke , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , T Frisson , E Gabathuler , E Garutti , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , T Greenshaw , M Gregori , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , I Herynek , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , M Kapichine , M Karlsson , J Katzy , N Keller , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , R Koutouev , K Krastev , J Kretzschmar , A Kropivnitskaya , J Kroseberg , K Kruger , J Kuckens , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , D Milstead , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , T Papadopoulou , C Pascaud , G D Patel , M Peez , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , F P Schilling , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , N Van Remortel , A V Trevino , Y Vazdik , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , C Wigmore , G G Winter , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , J Zimmermann , H Zohrabyan , F Zomer (2005) Measurement of beauty production at HERA using events with muons and jets EUROPEAN PHYSICAL JOURNAL C 41: 4. 453-467 JUN Abstract: A measurement of the beauty production cross section in ep collisions at a centre-of-mass energy of 319 GeV is presented. The data were collected with the H1 detector at the HERA collider in the years 1999-2000. Events are selected by requiring the presence of jets and muons in the final state. Both the long lifetime and the large mass of b-flavoured hadrons are exploited to identify events containing beauty quarks. Differential cross sections are measured in photoproduction, with photon virtualities Q(2) < 1 GeV2, and in deep inelastic scattering, where 2 < Q(2) < 100 GeV2. The results are compared with perturbative QCD calculations to leading and next-to-leading order. The predictions are found to be somewhat lower than the data.
Notes:
A Aktas , V Andreev , T Anthonis , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , W Erdmann , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , L Finke , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , A Fomenko , I Foresti , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , T Greenshaw , M Gregori , B R Grell , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , M Kapichine , J Katzy , N Keller , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , R Koutouev , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , J Kuckens , M P J Landon , W Lange , T Lastovicka , G Lastovicka-Medin , P Laycock , A Lebedev , B Leissner , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , M Peez , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , F P Schilling , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , N Van Remortel , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , B Vujicic , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , C Wigmore , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2005) Measurement of deeply virtual Compton scattering at HERA EUROPEAN PHYSICAL JOURNAL C 44: 1. 1-11 SEP Abstract: A measurement is presented of elastic deeply virtual Compton scattering gamma* p -> gamma p made using e(+) p collision data corresponding to a luminosity of 46.5 pb(-1), taken with the H1 detector at HERA. The cross section is measured as a function of the photon virtuality, Q(2), the invariant mass of the gamma* p system, W, and for the first time, differentially in the squared momentum transfer at the proton vertex, t, in the kinematic range 2 < Q(2) < 80 GeV2, 30 < W < 140 GeV and vertical bar t vertical bar < 1 GeV2. QCD based calculations at next-to-leading order using generalized parton distributions can describe the data, as can colour dipole model predictions.
Notes:
A Aktas , V Andreev , T Anthonis , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , Y de Boer , B Delcourt , A De Roeck , K Desch , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , W Erdmannn , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , L Finke , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , A Formenko , I Foresti , G Franke , T Frisson , E Gabathuler , E Garutti , J Gayler , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , T Greenshaw , M Gregori , B R Grell , G Grinedhammer , C Gwilliam , D Haidt , L Hajduk , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , T Hreus , A Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , A W Jung , H Jung , M Kapichine , J Katzy , N Keller , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , J Kuckens , M P J Landon , W Lange , T Lastovicka , G Lastovicka-Medin , P Laycock , A Lebedev , G Leibenguth , B Leissner , V Lendermann , S Levonian , L Lindfeld , K Lipka , A Liptaj , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , D Milstead , D Mladenov , A Mohamed , F Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , I Panagoulias , T Papadopoulou , C Pascaud , G D Patel , M Peez , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , E P Schilling , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , K Sedlak , E Sefkow , R N Shaw-West , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , M Urban , A Usik , D Utkin , S Valkar , A Valkarovda , C Vallee , P Van Mechelen , N Van Remortel , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , B Vujicic , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , C Wigmore , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , Y C Zhu , J Zimmermann , T Zimmermann , H Zohrabyan , F Zomer (2005) Search for leptoquark bosons in ep collisions at HERA PHYSICS LETTERS B 629: 1. 9-19 NOV 17 Abstract: A search for scalar and vector leptoquarks coupling to first generation fermions is performed using the e(+) p and e(-) p scattering data collected by the H1 experiment between 1994 and 2000. The data correspond to a total integrated luminosity of 117 pb(-1). No evidence for the direct or indirect production of such particles is found in data samples with a large transverse momentum final state electron or with large missing transverse momentum. Constraints on leptoquark models are established. For leptoquark couplings of electromagnetic strength, leptoquarks with masses up to 275-325 GeV are ruled out at 95% confidence level. These limits improve and supercede earlier H1 limits based on subsamples of the data used here. (c) 2005 Elsevier B.V. All rights reserved.
Notes:
A Aktas , V Andreev , T Anthonis , S Aplin , A Asmone , A Astvatsatourov , A Babaev , S Backovic , J Bahr , A Baghdasaryan , P Baranov , E Barrelet , W Bartel , S Baudrand , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , J C Bizot , M O Boenig , V Boudry , J Bracinik , G Brandt , V Brisson , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Cerny , V Chekelian , J G Contreras , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , V Dodonov , A Dubak , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , W Erdmann , S Essenov , A Falkewicz , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , L Finke , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , T Frisson , E Gabathuler , E Garutti , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , S Ginzburgskaya , A Glazov , I Glushkov , L Goerlich , M Goettlich , N Gogitidze , S Gorbounov , C Goyon , C Grab , T Greenshaw , M Gregori , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , M Hildebrandt , K H Hiller , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , M Kapichine , M Karlsson , J Katzy , N Keller , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , V Korbel , P Kostka , R Koutouev , K Krastev , J Kretzschmar , A Kropivnitskaya , K Kruger , J Kuckens , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , A I Lucaci-Timoce , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , D Milstead , A Mohamed , R Moreau , A Morozov , J V Morris , M U Mozer , K Muller , P Murin , K Nankov , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , S Osman , D Ozerov , V Palichik , T Papadopoulou , C Pascaud , G D Patel , M Peez , E Perez , D Perez-Astudillo , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , B Portheault , B Povh , P Prideaux , N Raicevic , P Reimer , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , F Salvaire , D P C Sankey , E Sauvan , S Schatzel , F P Schilling , S Schmidt , S Schmitt , C Schmitz , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , I Tsakov , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , N Van Remortel , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , B Vujicic , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , C Wigmore , G G Winter , C Wissing , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , J Zimmermann , H Zohrabyan , F Zomer (2005) Measurement of charm and beauty photoproduction at HERA using D*mu correlations PHYSICS LETTERS B 621: 1-2. 56-71 AUG 11 Abstract: A measurement of charm and beauty photoproduction at the electron proton collider HERA is presented based on the simultaneous detection of a D*(+/-) meson and a muon. The correlation between the D* meson and the muon serves to separate the charm and beauty contributions and the analysis provides comparable sensitivity to both. The total and differential experimental cross sections are compared to LO and NLO QCD calculations. The measured charm cross section is in good agreement with QCD predictions including higher order effects while the beauty cross section is higher. (c) 2005 Elsevier B.V. All rights reserved.
Notes:
2004
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , C Collard , J G Contreras , Y R Coppens , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , E Garutti , J Garvey , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , S Gorbounov , C Grab , H Grassler , T Greenshaw , M Gregori , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , R D Heuer , M Hildebrandt , K H Hiller , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , B Koblitz , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , J Kuckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , I Milcewicz , D Milstead , A Mohamed , F Moreau , A Morozov , I Morozov , J V Morris , M U Mozer , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , G Ossoskov , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , R Poschl , B Portheault , B Povh , N Raicevic , Z Ratiani , P Reimer , B Reisert , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , A Uraev , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , N Van Remortel , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , G G Winter , C Wissing , E E Woehrling , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2004) Measurement of anti-deuteron photoproduction and a search for heavy stable charged particles at HERA EUROPEAN PHYSICAL JOURNAL C 36: 4. 413-423 AUG Abstract: The cross section for anti-deuteron photoproduction is measured at HERA at a mean centre-of-mass energy of W-gammap=200 GeV in the range 0.2 < p(T)/M < 0.7 and \y\ < 0.4, where M, p(T) and y are the mass, transverse momentum and rapidity of the anti-deuteron in the HERA laboratory frame, respectively. The numbers of anti-deuterons per event are found to be similar in photoproduction to those in central proton-proton collisions at the CERN ISR but much lower than those in central Au-Au collisions at RHIC. The coalescence parameter B-2, which characterizes the likelihood of anti-deuteron production, is measured in photoproduction to be 0.010+/-0.002+/-0.001, which is much higher than in Au-Au collisions at a similar nucleon-nucleon centre-of-mass energy. No significant production of particles heavier than deuterons is observed and upper limits are set on the photoproduction cross sections for such particles.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , C Collard , J G Contreras , Y R Coppens , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , A Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , E Garutti , J Garvey , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , S Gorbounov , C Grab , H Grassler , T Greenshaw , M Gregori , G Grindhamnmer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , R D Heuer , A Hildebrandt , K H Hiller , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , B Koblitz , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , J Kuckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehtar , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , I Milcewicz , D Milstead , A Mohamed , E Moreau , A H Morozov , I H Morozov , J V Morris , M U Mozer , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivieri , J E Olsson , G Ossoskov , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , R Poschl , B Portheault , B Povh , N Raicevic , Z Ratiani , P Reimer , B Reisert , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , E Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , A Uraev , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , N Van Remortel , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , K Wacker , J Wagner , K Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , G G Winter , C Wissing , E E Woehrling , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2004) Evidence for a narrow anti-charmed baryon state PHYSICS LETTERS B 588: 1-2. 17-28 MAY 20 Abstract: A narrow resonance in D*(-)p and D*(+)(p) over bar invariant mass combinations is observed in inelastic electron-proton collisions at centre-of-mass energies of 300 GeV and 320 GeV at HERA. The resonance has a mass of 3099 +/- 3(stat.) +/- 5(syst.) MeV and a measured Gaussian width of 12 +/- 3(stat.) MeV, compatible with the experimental resolution. The resonance is interpreted as an anti-charmed baryon with a minimal constituent quark composition of uudd (c) over bar, together with the charge conjugate. (C) 2004 Elsevier B.V. All rights reserved.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , W Braunschweig , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , V Chekelian , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , J D Dowell , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , S Gorbounov , C Grab , V Grabski , H Grassler , T Greenshaw , M Gregori , G Grindhammer , D Haidt , L Hajduk , J Haller , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , M Hildebrandt , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , F Keil , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , J Kueckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , S Luders , D Luke , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , D Milstead , F Moreau , A Morozov , I Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , F Niebergall , C Niebuhr , D Nikitin , G Nowak , M Nozicka , B Olivier , J E Olsson , G Ossoskov , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , D Pitzl , R Poschl , B Povh , N Raicevic , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , S Vassiliev , Y Vazdik , C Veelken , A Vest , A Vichnevski , S Vinokurova , V Volchinski , K Wacker , J Wagner , B Waugh , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , M Winde , G G Winter , C Wissing , E E Woehrling , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2004) Inclusive dijet production at low Bjorken-x in deep inelastic scattering EUROPEAN PHYSICAL JOURNAL C 33: 4. 477-493 MAR Abstract: Dijet production in deep inelastic ep scattering is investigated in the region of low values of the Bjorken-variable x (10(-4) < x < 10(-2)) and low photon virtualities Q(2) (5 < Q(2) < 100 GeV2). The measured dijet cross sections are compared with perturbative QCD calculations in next-to-leading order. For most dijet variables studied, these calculations can provide a reasonable description of the data over the full phase space region covered, including the region of very low x. However, large discrepancies at low x and low Q(2) are observed for events with small separation in azimuth between the two highest transverse momentum jets. This region of phase space is described better by predictions based on the CCFM evolution equation, which incorporates k(t) factorized unintegrated parton distributions. A reasonable description can be also obtained using the Color Dipole Model or models incorporating virtual photon structure.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , E Garutti , J Garvey , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , S Gorbounov , C Grab , H Grassler , T Greenshaw , M Gregori , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , R D Heuer , M Hildebrandt , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , G Knies , A Knutsson , B Koblitz , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , J Kuckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Liessner , R Lemrani , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , I Milcewicz , D Milstead , A Mohamed , F Moreau , A Morozov , I Morozov , J V M Morris , M U Mozer , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , Mn Nozicka , R Oganezov , B Olivier , J E Olsson , G Ossoskov , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , R Poschl , B Portheault , B Povh , N Raicevic , Z Ratiani , P Reimer , B Reisert , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , A Uraev , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , S Vassiliev , Y Vazdik , C Veelken , A Vest , A Vichnevski , S Vinokurova , V Volchinski , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , G G Winter , C Wissing , E E Woehrling , R Wolf , E Wunsch , S Xella , W Yan , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2004) Search for squark production in R-parity violating supersymmetry at HERA EUROPEAN PHYSICAL JOURNAL C 36: 4. 425-440 AUG Abstract: A search for squarks in R-parity violating supersymmetry is performed in e(+/-)p collisions at HERA using the H1 detector. The data were taken at a centre-of-mass energy of 319 GeV and correspond to an integrated luminosity of 64.3 pb(-1) for e (+) p collisions and 13.5 pb(-1) for e(-)p collisions. The resonant production of squarks via a Yukawa coupling lambda' is considered, taking into account direct and indirect R-parity violating decay modes. No evidence for squark production is found in the multi-lepton and multi-jet final state topologies investigated. Mass dependent limits on lambda' are obtained in the framework of the Minimal Supersymmetric Standard Model. In addition, the results are interpreted in terms of constraints on the parameters of the minimal Supergravity model. At the 95% confidence level squarks of all flavours with masses up to 275 GeV are excluded in a large part of the parameter space for a Yukawa coupling of electromagnetic strength. For a coupling strength 100 times smaller, masses up to 220 GeV can be ruled out.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , W Braunschweig , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , V Chekelian , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , J D Dowell , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , S Gorbounov , C Grab , V Grabski , H Grassler , T Greenshaw , M Gregori , G Grindhammer , D Haidt , L Hajduk , J Haller , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , M Hildebrandt , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , F Keil , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , J Kueckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , S Luders , D Luke , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , D Milstead , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , F Niebergall , C Niebuhr , D Nikitin , G Nowak , M Nozicka , B Olivier , J E Olsson , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , D Pitzl , R Poschl , B Povh , N Raicevic , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , S Vassiliev , Y Vazdik , C Veelken , A Vest , A Vichnevski , V Volchinski , K Wacker , J Wagner , B Waugh , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , M Winde , G G Winter , C Wissing , E E Woehrling , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2004) Search for single top quark production in ep collisions at HERA EUROPEAN PHYSICAL JOURNAL C 33: 1. 9-22 MAR Abstract: A search for single top quark production is performed in e(+/-) pcollisions at HERA. The search exploits data corresponding to an integrated luminosity of 118.3 pb(-1). A model for the anomalous production of top quarks in a flavour changing neutral current process involving a tugamma coupling is investigated. Decays of top quarks into a b quark and a W boson are considered in the leptonic and the hadronic decay channels of the W. Both a cut-based analysis and a multivariate likelihood analysis are performed to discriminate anomalous top quark production from Standard Model background processes. In the leptonic channel, 5 events are found while 1.31 +/- 0.22 events are expected from the Standard Model background. In the hadronic channel, no excess above the expectation for Standard Model processes is found. These observations lead to a cross section (ep --> e t X) = 0.29(-0.14)(+0.15) pb at roots = 319 GeV. Alternatively, assuming that the observed events are due to a statistical fluctuation, upper limits of 0.55 pb on the anomalous top production cross section and of 0.27 on the tugamma coupling k(tugamma) are established at the 95% confidence level.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S B Baumgartner , J B Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , W Braunschweig , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , N Delerue , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , J D Dowell , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K GAbathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , S Gorbounov , C Grab , V Grabski , H Grassler , T Greenshaw , M Gregori , G Grindhammer , S Haidt , L Hajduk , J Haller , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , R D Heuer , M Hildebrandt , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnsin , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , G Knies , A Knutsson , B Koblitz , S D Kolya , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , J Kuckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , S Luders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , R Marage , J Marks , R Marshall , M Martisikova , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , I Milcewicz , D Milstead , F Moreau , A Morozov , I Morozov , J V Morris , M Mozer , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , M Nozicka , B Olivier , J E Olsson , G Ossoskov , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , A Perieanu , A Petrukhin , D Pitzl , R Poschl , B Portheault , B Povh , N Raicevic , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheinsi , F P Schilling , P Schleper , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , G Thompson , P D Thompson , E Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , S Vassiliev , Y Vazdik , C Veelken , A Vest , A Vichnevski , S Vinokurova , V Volchinski , K Wacker , J Wagner , B Waugh , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , M Winde , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2004) Muon pair production in ep collisions at HERA PHYSICS LETTERS B 583: 1-2. 28-40 MAR 11 Abstract: Cross sections for the production of two isolated muons up to high di-muon masses are measured in ep collisions at HERA with the H1 detector in a data sample corresponding to an integrated luminosity of 71 pb(-1) at a centre of mass energy of roots = 319 GeV. The results are in good agreement with Standard Model predictions, the dominant process being photon-photon interactions. Additional muons or electrons are searched for in events with two high transverse momentum muons using the full data sample corresponding to 114 pb(-1), where data at roots = 301 GeV and roots = 319 GeV are combined. Both the di-lepton sample and the tri-lepton sample agree Well with the predictions. (C) 2004 Published by Elsevier B.V.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Astvatsatourov , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , A Beglarian , O Behnke , O Behrendt , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , W Braunschweig , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , V Chekelian , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , S Gorbounov , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , D Haidt , L Hajduk , J Haller , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladk , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , F Keil , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , R Koutouev , A Koutov , A Kropivnitskaya , J Kroseberg , J Kueckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , S Luders , D Luke , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , I Milcewicz-Mika , D Milstead , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Ngovizin , B Naroska , J Naumann , T Naumann , P R Newman , F Niebergall , C Niebuhr , D Nikitin , G Nowak , M Nozicka , B Olivier , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , J P Phillips , D Pitzl , R Poschl , B Povh , N Raicevic , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , S Vassiliev , Y Vazdik , C Veelken , A Vest , A Vichnevski , V Volchinski , K Wacker , J Wagner , B Waugh , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , M Winde , G C Winter , C Wissing , E E Woehrling , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2004) Forward pi(o) production and associated transverse energy flow in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 36: 4. 441-452 AUG Abstract: Deep-inelastic positron-proton interactions at low values of Bjorken-x down to xapproximate to4.10(-5) which give rise to high transverse momentum pi(circle)-mesons are studied with the H1 experiment at HERA. The inclusive cross section for pi(circle)-mesons produced at small angles with respect to the proton remnant (the forward region) is presented as a function of the transverse momentum and energy of the pi(circle) and of the four-momentum transfer Q(2) and Bjorken-x. Measurements are also presented of the transverse energy flow in events containing a forward pi(circle)-meson. Hadronic final state calculations based on QCD models implementing different parton evolution schemes are confronted with the data.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , A Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , J G Contreras , Y R Coppens , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , E Garutti , J Garvey , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , S Ginzburgskaya , L Goerlich , N Gogitidze , S Gorbounov , C Grab , H Grassler , T Greenshaw , M Gregori , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , I Herynek , R D Heuer , M Hildebrandt , K H Hiller , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , B Koblitz , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , K Kruger , J Kuckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , D Milstead , A Mohamed , F Moreau , A Morozov , I Morozov , J V Morris , M U Mozer , K Muller , P Murin , V Nagovizin , K Nankov , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , G Ossoskov , D Ozerov , A Paramonov , C Pascaud , G D Patel , M Peez , E Perez , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , R Poschl , B Portheault , B Povh , N Raicevic , P Reimer , B Reisert , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , A Uraev , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , N Van Remortel , A V Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , G G Winter , C Wissing , E E Woehrling , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , H Zohrabyan , F Zomer (2004) A general search for new phenomena in ep scattering at HERA PHYSICS LETTERS B 602: 1-2. 14-30 NOV 18 Abstract: A model-independent search for deviations from the Standard Model prediction is performed in e(+) p and e(-) p collisions at HERA using H1 data corresponding to an integrated luminosity of 117 pb(-1). For the first time all event topologies involving isolated electrons, photons, muons, neutrinos and jets with high transverse momenta are investigated in a single analysis. Events are assigned to exclusive classes according to their final state. A statistical algorithm is developed to search for deviations from the Standard Model in the distributions of the scalar sum of transverse momenta or invariant mass of final state particles and to quantify their significance. A good agreement with the Standard Model prediction is observed in most of the event classes. The most significant deviation is found for a topology containing an isolated muon, missing transverse momentum and a jet, consistent with a previously reported observation. (C) 2004 Elsevier B.V. All rights reserved.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , J G Contreras , Y Coppens , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P M Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , E Garutti , J Garvey , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , S Ginzburgskaya , L Goerlich , N Gogitidze , S Gorbounov , C Grab , H Grassler , T Greenshaw , M Gregori , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , G Herrera , I Herynek , R D Heuer , M Hildebrandt , K H Hiller , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , A Ismail , A Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , B Koblitz , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , K Kruger , J Kuckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , H Meyer , J Meyer , S Mikocki , I Milcewicz-Mika , D Milstead , A Mohamed , F Moreau , A Morozov , I Morozov , J V Morris , M U Mozer , K Muller , P Murin , V Nagovizin , K Nankov , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , G Ossoskov , D Ozerov , A Paramonov , C Pascaud , G D Patel , M Peez , E Perez , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , R Poschl , B Portheault , B Povh , N Raicevic , P Reimer , B Reisert , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , R Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , A Uraev , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , N Van Remortel , A Vargas Trevino , Y Vazdik , C Veelken , A Vest , S Vinokurova , V Volchinski , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , G G Winter , C Wissing , E E Woehrling , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhelezov , A Zhokin , H Zohrabyan , E Zomer (2004) Search for bosonic stop decays in R-parity violating supersymmetry in e(+)p collisions at HERA PHYSICS LETTERS B 599: 3-4. 159-172 OCT 14 Abstract: A search for scalar top quarks in R-parity violating supersymmetry is performed in e(+)p collisions at HERA using the H1 detector. The data, taken at roots = 319 GeV and 301 GeV, correspond to an integrated luminosity of 106 pb(-1). The resonant production of scalar top quarks t in positron quark fusion via an R-parity violating Yukawa coupling lambda' is considered with the subsequent bosonic stop decay t --> BW. The R-parity violating decay of the sbottom quark b --> dv(e) and leptonic and hadronic W decays are considered. No evidence for stop production is found in the search for bosonic stop decays nor in a search for the direct R-parity violating decay t --> eq. Mass dependent limits on lambda' are obtained in the framework of the minimal supersymmetric Standard Model. Stop quarks with masses up to 275 GeV can be excluded at the 95% confidence level for a Yukawa coupling of electromagnetic strength. (C) 2004 Elsevier B.V. All rights reserved.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , C Collard , J G Contreras , Y R Coppens , J A Coughlan , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , E Garutti , J Garvey , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , S Gorbounov , C Grab , H Grassler , T Greenshaw , M Gregori , G Grindhammer , C Gwilliam , D Haidt , L Hajduk , J Haller , M Hansson , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , R D Heuer , M Hildebrandt , K H Hiller , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Klimkovich , T Kluge , G Knies , A Knutsson , B Koblitz , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , J Kuckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , L Lindfeld , K Lipka , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , M Martisikova , H U Martyn , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , I Milcewicz-Mika , D Milstead , A Mohamed , F Moreau , A Morozov , I Morozov , J V Morris , M U Mozer , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , A Nikiforov , D Nikitin , G Nowak , M Nozicka , R Oganezov , B Olivier , J E Olsson , G Ossoskov , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , A Perieanu , A Petrukhin , D Pitzl , R Placakyte , R Poschl , B Portheault , B Povh , N Raicevic , Z Ratiani , P Reimer , B Reisert , A Rimmer , C Risler , E Rizvi , P Robmann , B Roland , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , V Tchoulakov , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , A Uraev , M Urban , A Usik , D Utkin , S Valkar , A Valkarova , C Vallee , P Van Mechelen , N Van Remortel , A V Trevino , Y Vazdik , C Veelken , A VEst , S Vinokurova , V Volchinski , K Wacker , J Wagner , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , G G Winter , C Wissing , E E Woehrling , R Wolf , E Wunsch , S Xella , W Yan , V Yeganov , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2004) Measurement of the proton structure function F-2 at low Q(2) in QED Compton scattering at HERA PHYSICS LETTERS B 598: 3-4. 159-171 SEP 30 Abstract: The proton structure function F-2(x, Q(2)) is measured in inelastic QED Compton scattering using data collected with the H1 detector at HERA. QED Compton events are used to access the kinematic range of very low virtualities of the exchanged photon, Q(2), down to 0.5 GeV2, and Bjorken x up to similar to 0.06, a region which has not been covered previously by inclusive measurements at HERA. The results are in agreement with the measurements from fixed target lepton-nucleon scattering experiments. (C) 2004 Published by Elsevier B.V.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , N Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , W Braunschweig , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , K Cerny , V Chekelian , J Chyla , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , N Delerue , R Demirchyan , A De Roeck , K Desch , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , J D Dowell , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmanne , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , L Foresti , J Formanek , G Ranke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , S Gorbounov , C Grab , V Grabski , H Grassler , T Greenshaw , M Gregori , G Grindhammer , D Haidt , L Hajduk , J Haller , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , R D Heuer , M Hildebrandt , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Ismail , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , G Knies , A Knutsson , B Koblitz , S D Kolya , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , J Kuckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , S Luders , D Luke , T Lux , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , M Martisikova , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , I Milcewicz , D Milstead , F Moreau , A Morozov , I Morozov , J V Morris , M Mozer , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , C Niebuhr , D Nikitin , G Nowak , M Nozicka , B Olivier , J E Olsson , G Ossoskov , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , A Perieanu , A Petrukhin , D Pitzl , R Poschl , B Portheault , B Povh , N Raicevic , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , Z Rurikova , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , M Tasevsky , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , E Tzamariudaki , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , S Vassiliev , Y Vazdik , C Veelken , A Vest , A Vichnevski , S Vinokurova , V Volchinski , K Wacker , J Wagner , B Waugh , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , M Winde , G G Winter , C Wissing , E E Woehrling , E Wunsch , W Yan , J Zacek , J Zalesak , Z Zhang , A Zhokin , H Zohrabyan , F Zomer (2004) Measurement of dijet production at low Q(2) at HERA EUROPEAN PHYSICAL JOURNAL C 37: 2. 141-159 SEP Abstract: Triple differential dijet cross sections in e(+/-)p interactions are presented in the region of photon virtualities 2 < Q(2) < 80 GeV2, inelasticities 0.1 < y < 0.85, jet transverse energies E*(T1) > 7GeV, E*(T2) > 5 GeV, and pseudorapidities - 2.5 < η(1)*, η(2)* < 0. The measurements are made in the gamma*p centre-of-mass frame, using an integrated luminosity of 57 pb(-1). The data are compared with NLO QCD calculations and LO Monte Carlo programs with and without a resolved virtual photon contribution. NLO QCD calculations fail to describe the region of low Q(2) and low jet transverse energies, in contrast to a LO Monte Carlo generator which includes direct and resolved photon interactions with both transversely and longitudinally polarised photons. Initial and final state parton showers are tested as a mechanism for including higher order QCD effects in low E-T jet production.
Notes:
2003
C Adloff , V Andreev , B Andrieu , T Anthonis , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , A Beglarian , O Behnke , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , V Chekelian , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , D Haidt , L Hajduk , J Haller , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , J Katzy , F Keil , N Keller , J Kennedy , I R Kenyon , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , R Koutouev , A Koutov , J Kroseberg , K Kruger , T Kuhr , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , D Milstead , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , F Niebergall , C Niebuhr , O Nix , G Nowak , M Nozicka , B Olivier , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner-Sadenius , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , S Tchetchelnitski , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , S Vassiliev , Y Vazdik , C Veelken , A Vest , A Vichnevski , V Volchinski , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , S Wiesand , N Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2003) Measurement of inclusive jet cross sections in photoproduction at HERA EUROPEAN PHYSICAL JOURNAL C 29: 4. 497-513 AUG Abstract: Inclusive jet cross sections are measured in photoproduction at HERA using the H1 detector. The data sample of e(+)p --> e(+) + jet + X events in the kinematic range of photon virtualities Q(2) less than or equal to 1GeV(2) and photon-proton centre-of-mass energies 95 less than or equal to W-gammap less than or equal to 285GeV represents an integrated luminosity of 24.1pb(-1). Jets are defined using the inclusive k(perpendicular to) algorithm. Single- and multi-differential cross sections are measured as functions of jet transverse energy E-T(jet) and pseudorapidity eta(jet) in the domain 5 less than or equal to E-T(jet) less than or equal to 75GeV and -1 less than or equal to eta(jet) less than or equal to 2.5. The cross sections are found to be in good agreement with next-to-leading order perturbative QCD calculations corrected for fragmentation and underlying event effects. The cross section differential in E-T(jet), which varies by six orders of magnitude over the measured range, is compared with similar distributions from p (p) over bar colliders at equal and higher energies.
Notes:
V Andreev , B Andrieu , T Anthonis , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , A Beglarian , O Behnke , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , V Boudry , J Bracinik , W Braunschweig , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , V Chekelian , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , S Gorbounov , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , D Haidt , L Hajduk , J Haller , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , J Katzy , F Keil , N Keller , J Kennedy , I R Kenyon , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , R Koutouev , A Koutov , J Kroseberg , K Kruger , J Kueckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , B List , E Lobodzinska , B Lobodzinski , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , D Milstead , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , F Niebergall , C Niebuhr , G Nowak , M Nozicka , B Olivier , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner-Sadenius , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , S Tchetchelnitski , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , S Vassiliev , Y Vazdik , C Veelken , A Vest , A Vichnevski , V Volchinski , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , M Winde , G G Winter , C Wissing , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2003) Isolated electrons and muons in events with missing transverse momentum at HERA PHYSICS LETTERS B 561: 3-4. 241-257 MAY 29 Abstract: A search for events with a high-energy isolated electron or muon and missing transverse momentum has been performed at the electron-proton collider HERA using an integrated luminosity of 13.6 pb(-1) in e(-) p scattering and 104.7 pb(-1) in e(+) p scattering. Within the Standard Model such events are expected to be mainly due to W boson production with subsequent leptonic decay. In e(-) p interactions one event is observed in the electron channel and none in the muon channel, consistent with the expectation of the Standard Model. In the e(+) p data a total of 18 events are seen in the electron and muon channels compared to an expectation of 12.4 +/- 1.7 dominated by W production (9.4 +/- 1.6). Whilst the overall observed number of events is broadly in agreement with the number predicted by the Standard Model, there is-an excess of events with transverse momentum of the hadronic system greater than 25 GeV with 10 events found compared to 2.9 +/- 0.5 expected. The results are used to determine the cross-section for events with an isolated electron or muon and missing transverse momentum. (C) 2003 Published by Elsevier Science B.V.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , A Beglarian , O Behnke , A Belousov , C Berger , I Berndt , J C Bizot , J Bohme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , V Chekelian , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , P Fleischmann , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formadnek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , J Haller , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , J Katzy , F Keil , N Keller , J Kennedy , I R Kenyon , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , A Knutsson , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , J Kroseberg , K Kruger , T Kuhr , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Malden , E Malinovski , S Mangano , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , D Milstead , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , F Niebergall , C Niebuhr , O Nix , G Nowak , M Nozicka , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitti , M Schneider , L Schoeffel , A Schoning , T Schorner-Sadenius , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , E Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smimov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , S Tchetchelnitski , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , S Vassiliev , Y Vazdik , A Vest , A Vichnevski , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , D Wegener , C Werner , N Werner , M Wessels , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2003) Search for new physics in e +/- q contact interactions at HERA PHYSICS LETTERS B 568: 1-2. 35-47 AUG 21 Abstract: Deep-inelastic e(+/-) p scattering at high squared momentum transfer Q(2) up to 30 000 GeV2 is used to search for eq contact interactions associated to scales far beyond the HERA centre of mass energy. The neutral current cross section measurements dsigma / dQ(2), corresponding to integrated luminosities of 16.4 pb(-1) of e(-) p data and 100.8 pb(-1) of e(+) p data, are well described by the Standard Model and are analysed to set constraints on new phenomena. For conventional contact interactions lower limits are set on compositeness scales A ranging between 1.6-5.5 TeV. Couplings and masses of leptoquarks and squarks in R-parity violating supersymmetry are constrained to M / lambda > 0.3-1.4 TeV. A search for low scale quantum gravity effects in models with large extra dimensions provides limits on the effective Planck scale of MS > 0.8 TeV. A form factor analysis yields a bound on the radius of light quarks of R-q < 1.0 10(-18) m. (C) 2003 Published by Elsevier B.V.
Notes:
A Aktas , V Andreev , T Anthonis , A Astvatsatourov , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , A Beglarian , O Behnke , O Behrendt , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , W Braunschweig , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , V Chekelian , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , A Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , R Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , S Gorbounov , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , D Haidt , L Hajduk , J Haller , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , R Keil , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , R Koutouev , A Koutov , J Kroseberg , K Kruger , J Kueckens , T Kuhr , M P J Landon , W Lange , T Lastovika , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , S Luders , D Luke , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , D Milstead , S Mohrdieck , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , F Niebergall , C Niebuhr , D Nikitin , G Nowak , M Nozicka , B Olivier , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , J P Phillips , D Pitzl , R Poschl , B Povh , N Raicevic , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulong , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , S Vassiliev , Y Vazdik , C Veelken , A Vest , A Vichnevski , V Volchinski , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , M Winde , G G Winter , C Wissing , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2003) Diffractive photoproduction of J/psi mesons with large momentum transfer at HERA PHYSICS LETTERS B 568: 3-4. 205-218 AUG 28 Abstract: The diffractive photoproduction of J/psi mesons is measured with the HI detector at the ep collider HERA using an integrated luminosity of 78 pb(-1). The differential cross section dsigma(gammap --> J/psiY)/dt is studied in the range 2 < \t\ < 30 GeV2, where t is the square of the four-momentum transferred at the proton vertex. The cross section is also presented as a function of the photon-proton centre-of-mass energy W-gammap in three t intervals, spanning the range 50 < W-gammap < 200 GeV. A fast rise of the cross section with W-gammap is observed for each t range and the slope for the effective linear Pomeron trajectory is measured to be alpha' = -0.0135 +/- 0.0074(stat.) +/- 0.0051(syst.) GeV-2. The measurements are compared with perturbative QCD models based on BFKL and DGLAP evolution. The data are found to be compatible with s-channel helicity conservation. (C) 200 Published by Elsevier B.V.
Notes:
A Aktas , V Andreev , T Anthonis , A Asmone , A Babaev , S Backovic , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , O Behnke , O Behrendt , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , M O Boenig , V Boudry , J Bracinik , W Braunschweig , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , V Chekelian , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , V Dodonov , J D Dowell , A Dubak , C Duprel , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , S Gorbounov , C Grab , V Grabski , H Grassler , T Greenshaw , M Gregori , G Grindhammer , D Haidt , L Hajduk , J Haller , G Heinzelmann , R C W Henderson , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , M Hildebrandt , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , M Jacquet , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , H Jung , D Kant , M Kapichine , M Karlsson , J Katzy , F Keil , N Keller , J Kennedy , I R Kenyon , C Kiesling , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , R Koutouev , A Kropivnitskaya , J Kroseberg , J Kueckens , T Kuhr , M P J Landon , W Lange , T Lastovicka , P Laycock , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , B List , E Lobodzinska , N Loktionova , R Lopez-Fernandez , V Lubimov , H Lueders , S Luders , D Luke , L Lytkin , A Makankine , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , D Milstead , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , F Niebergall , C Niebuhr , D Nikitin , G Nowak , M Nozicka , B Olivier , J E Olsson , D Ozerov , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , D Pitzl , R Poschl , B Povh , N Raicevic , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , S S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , S Vassiliev , Y Vazdik , C Veelken , A Vest , A Vichnevski , V Volchinski , K Wacker , J Wagner , B Waugh , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , B Wessling , M Winde , G G Winter , C Wissing , E E Woehrling , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2003) Multi-electron production at high transverse momenta in ep collisions at HERA EUROPEAN PHYSICAL JOURNAL C 31: 1. 17-29 OCT Abstract: Multi-electron production is studied at high electron transverse momentum in positron- and electron-proton collisions using the H1 detector at HERA. The data correspond to an integrated luminosity of 115 pb(-1). Di-electron and tri-electron event yields are measured. Cross sections are derived in a restricted phase space region dominated by photon-photon collisions. In general good agreement is found with the Standard Model predictions. However, for electron pair invariant masses above 100 GeV, three di-electron events and three tri-electron events are observed, compared to Standard Model expectations of 0.30 +/- 0.04 and 0.23 +/- 0.04, respectively.
Notes:
W Egli , M Kraus (2003) Shortest paths in chemical kinetic applications PHYSICAL CHEMISTRY CHEMICAL PHYSICS 5: 18. 3916-3920 SEP 15 Abstract: A computational model for the determination of important reaction pathways in a system of reaction equations is presented. The reaction scheme is treated as a bipartite directed graph where the vertices are the species and the reactions. An edge represents the connection of a reactant species and a reaction or a reaction and a product species. The length (weight) of an edge is a function of the mass flow (flux) through the reaction. The total length of a pathway from a reactant to a product species is the sum over all edges from the source vertex to the destination vertex. The question of identifying the most important reactions is equivalent to finding the shortest path from a reactant species to a product species. Typically, changes of parameters in the kinetic system, e.g. temperature, pressure, initial concentrations and reaction time may result in different best paths or shortest path solutions. These changes can be monitored with our tool. An example of an application treating the decomposition of methane in a dielectric-barrier discharge is presented in this paper.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , A Beglarian , O Behnke , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , J Cao , S Caron , F Cassol-Brunner , V Chekelian , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , P Fleischmann , Y H Fleming , G Flucke , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , D Haidt , L Hajduk , J Haller , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , O Henshaw , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , J Katzy , F Keil , N Keller , J Kennedy , I R Kenyon , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , R Koutouev , A Koutov , J Kroseberg , K Kruger , T Kuhr , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Malden , E Malinovski , S Mangano , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , D Milstead , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newman , F Niebergall , C Niebuhr , O Nix , G Nowak , M Nozicka , B Olivier , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , J P Phillips , D Pitzl , B Portheault , R Poschl , I Potachnikova , B Povh , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , E Sauvan , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner-Sadenius , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , S Tchetchelnitski , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , S Vassiliev , Y Vazdik , C Veelken , A Vest , A Vichnevski , Volchinski , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , R Weber , D Wegener , C Werner , N Werner , M Wessels , S Wiesand , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2003) Measurement and QCD analysis of neutral and charged current cross sections at HERA EUROPEAN PHYSICAL JOURNAL C 30: 1. 1-32 SEP Abstract: The inclusive e(+)p single and double differential cross sections for neutral and charged current processes axe measured with the H1 detector at HERA. The data were taken in 1999 and 2000 at a centre-of-mass energy of roots = 319 GeV and correspond to an integrated luminosity of 65.2 pb(-1). The cross sections are measured in the range of four-momentum transfer squared Q(2) between 100 and 30 000 GeV2 and Bjorken x between 0.0013 and 0.65. The neutral current analysis for the new e(+)p data and the earlier e-p data taken in 1998 and 1999 is extended to small energies of the scattered electron and therefore to higher values of inelasticity y, allowing a determination of the longitudinal structure function F-L at high Q(2) (110 - 700 GeV2). A new measurement of the structure function x (F) over tilde (3) is obtained using the new e(+)p and previously published e p neutral current cross section data at high Q(2). These data together with H1 low Q(2) precision data are further used to perform new next-to-leading order QCD analyses in the framework of the Standard Model to extract flavour separated parton distributions in the proton.
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2002
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , P Bate , J Becker , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , T Berndt , J C Bizot , J Boehme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , J Burger , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , J Cao , S Caron , F Cassol-Brunner , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , J Haller , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , V Jeamanov , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , U Straumann , M Swart , M Tasevsky , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , M Weber , D Wegener , C Werner , M Werner , N Werner , M Wessels , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2002) Energy flow and rapidity gaps between jets in photoproduction at HERA EUROPEAN PHYSICAL JOURNAL C 24: 4. 517-527 AUG Abstract: Dijet events in photon-proton collisions in which there is a large pseudorapidity separation, Deltaeta > 2.5 between the two highest E-T jets are studied with the H1 detector at HERA. The inclusive dijet cross sections are measured as functions of the longitudinal momentum fractions of the proton and photon which participate in the production of the jets, x(p)(jets) and x(gamma)(jets) respectively, Deltaeta, the pseudorapidity P separation between the two highest E-T jets, and E-T(gap), the total summed transverse energy between the jets. Rapidity gap events are defined as events in which E-T(gap) is less than E-T(cut), for E-T(cut) varied between jets 0.5 and 2.0 GeV. The fraction of dijet events with a rapidity gap is measured differentially in Deltaeta, x(p)(jets) and x(gamma)(jets). An excess of events with rapidity gaps at low values of E-T(cut) is observed above the expectation from standard photoproduction processes. This excess can be explained by the exchange of a strongly interacting colour singlet object between the jets.
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C Adloff , V Andreev , B Andrieu , T Anthonis , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , A Beglarian , O Behnke , C Beier , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , P Fleischmann , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , J Haller , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , S Hurling , M Ibbotson , C Issever , A Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , J Kroseberg , K Kruger , T Kuhr , T Kurca , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Malden , E Malinovski , I Malinovski , S Mangano , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , G Radel , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , M Swart , S Tchetchelnitski , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vest , A Vichnevski , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , D Wegener , C Werner , N Werner , M Wessels , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2002) Diffractive photoproduction of psi(2S) mesons at HERA PHYSICS LETTERS B 541: 3-4. 251-264 AUG 15 Abstract: Results on diffractive photoproduction of psi(2S) mesons are presented using data collected between 1996 and 2000 with the H1 detector at the HERA ep collider. The data correspond to an integrated luminosity of 77 pb(-1). The energy dependence of the diffractive psi(2S) cross section is found to be similar to or possibly somewhat steeper than that for J/psi mesons. The dependences of the elastic and proton dissociative psi(2S) photoproduction cross sections on the squared momentum transfer t at the proton vertex are measured. The t-dependence of the elastic channel, parametrised as e(bt), yields b(el)(psi(2S)) = (4.31 +/- 0.57 +/- 0.46) GeV-2, compatible with that of the J/psi. For the proton dissociative channel the result b(pd)(psi(2S)) = (0.59 +/- 0.13 +/- 0.12) GeV-2 is 2.3 standard deviations smaller than that measured for the J/psi. With proper account of the individual wavefunctions theoretical predictions based on perturbative QCD are found to describe the measurements well. (C) 2002 Elsevier Science B.V. All rights reserved.
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C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , J Becker , A Beglarian , O Behnke , C Beier , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , J Burger , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , J Cao , S Caron , F Cassol-Brunner , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , J Haller , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , A Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , U Straumann , M Swart , M Tasevsky , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , M Vorobiev , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , M Weber , D Wegener , C Werner , M Werner , N Werner , M Wessels , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2002) A measurement of the t dependence of the helicity structure of diffractive rho meson electroproduction at HERA PHYSICS LETTERS B 539: 1-2. 25-39 JUL 11 Abstract: The helicity structure of the diffractive electroproduction of rho mesons, e + p --> e + rho + Y, is studied in a previously unexplored region of large four-momentum transfer squared at the proton vertex, t: 0 < t' < 3 GeV2, where t' = \t\ - \t\ min. The data used are collected with the HI detector at HERA in the kinematic domain 2.5 < Q(2) < 60 GeV2, 40 < W < 120 GeV No t dependence of the r(00)(04) spin density matrix element is found. A significant t dependent helicity non-conservation from the virtual photon to the rho meson is observed for the spin density matrix element combinations r(00)(5) + 2r(11)(5) and r(00)(1) + 2r(11)(1). These t dependences are consistently described by a perturbative QCD model based on the exchange of two gluons. (C) 2002 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , T Berndt , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , J Burger , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , L Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , P Merkel , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , J Scheins , R P Schilling , P Schleper , D Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , V Solochenko , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , U Straumann , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , K Wacker , R Wallny , B Waugh , G Weber , M Weber , D Wegener , C Werner , M Werner , N Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2002) Measurement of D*(+/-) meson production and F-2(c) in deep-inelastic scattering at HERA PHYSICS LETTERS B 528: 3-4. 199-214 MAR 7 Abstract: The inclusive production of D*+/-(2010) mesons in deep-inelastic scattering is studied with the HI detector at HERA. In the kinematic region 1 < Q(2) < 100 GeV2 and 0.05 < y < 0.7 an e(+) p cross section for inclusive D*+/- meson production of 8.50 +/- 0.42(stat.)(-100)(+1.21)(syst.) nb is measured in the visible range p(tD*) > 1.5 GeV and \eta(D*)\ < 1.5. Single and double differential inclusive D*+/- meson cross sections are compared to perturbative QCD calculations in two different evolution schemes, The charm contribution to the proton structure, F-c(2)(x, Q(2)), is determined by extrapolating the visible charm cross section to the full phase space. This contribution is found to rise from about 10% at Q(2) = 1.5 GeV2 to more than 25% at Q(2) = 60 GeV2 corresponding to x values ranging from 5 x 10(-5) to 3 x 10(-3). (C) 2002 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , A Beglarian , O Behnke , C Beier , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , T Carli , S Caron , F Cassol-Brunner , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , P Fleischmann , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , L Haller , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , J Kroseberg , K Kruger , T Kuhr , T Kurca , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Malden , E Malinovski , I Malinovski , S Mangano , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikochi , D Milstead , S Mohrdieck , M N Mondragon , D Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , G Radel , K Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , S Schatzel , J Scheins , F P Schilling , L Schoeffel , A Schoning , T Schorner-Sadenius , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , M Swart , S Tchetchelnitski , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vest , A Vichnevski , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , D Wegener , C Werner , N Werner , W Wessels , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , W Wunsck , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2002) Measurement of inclusive jet cross-sections in deep-inelastic ep scattering at HERA PHYSICS LETTERS B 542: 3-4. 193-206 AUG 29 Abstract: A measurement of inclusive jet cross-sections in deep-inelastic ep scattering at HERA is presented based on data with an integrated luminosity of 21.1 pb(-1). The measurement is performed for photon virtualities Q(2) between 5 and 100 GeV2, differentially in Q(2), in the jet transverse energy E-T, in E-T(2)/Q(2) and in the pseudorapidity eta(lab). With the renormalization scale mu(R) = E-T, perturbative QCD calculations in next-to-leading order (NLO) give a good description of the data in most of the phase space. Significant discrepancies are observed only for jets in the proton beam direction with ET below 20 GeV and Q2 below 20 GeV2. This corresponds to the region in which NLO corrections are largest and further improvement of the calculations is thus of particular interest. (C) 2002 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , P Bate , J Becker , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , T Berndt , J C Bizot , J Boehme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , J Burger , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , J Cao , S Caron , F Cassol-Brunner , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , A Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , A Goldberg , C Grab , H Grassler , T Greenshaw , G Grindhammmer , T Hadig , D Haidt , L Hajduk , J Haller , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , A Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , A Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , U Straumann , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , K Wacker , R Wallny , B Waugh , G Weber , M Weber , D Wegener , C Werner , M Werner , N Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2002) Search for excited neutrinos at HERA PHYSICS LETTERS B 525: 1-2. 9-16 JAN 17 Abstract: We present a search for excited neutrinos using e(-) p data taken by the H1 experiment at HERA at a center-of-mass energy of 318 GeV with an integrated luminosity of 15 pb(-1). No evidence for excited neutrino production is found. Mass dependent exclusion limits are determined for the ratio of the coupling to the compositeness scale, f/Lambda, independently of the relative couplings to the SU(2) and U(1) gauge bosons. These limits extend the excluded region to higher masses than has been possible in previous searches at other colliders. (C) 2002 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , T Berndt , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , J Burger , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , J Cao , S Caron , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , L Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , U Straumann , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , K Wacker , R Wallny , B Waugh , G Weber , M Weber , D Wegener , C Werner , M Werner , N Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2002) Measurement of dijet electroproduction at small jet separation EUROPEAN PHYSICAL JOURNAL C 24: 1. 33-41 MAY Abstract: Deep-inelastic scattering data in the range 150 < Q(2) < 35000 GeV2 are used to investigate the minimum jet separation necessary to allow accurate description of the rate of dijet production using next-to-leading order perturbative QCD calculations. The required jet separation is found to be small, allowing about 1/3 of DIS data to be classified as dijet, as opposed to approximately 1/10 with more typical jet analyses. A number of precision measurements made using this dijet sample are well described by the calculations. The data are also described by the combination of leading order matrix elements and parton showers, as implemented in the QCD based Monte Carlo model RAPGAP.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , J Becker , M Beckingham , A Beglarian , O Behnke , C Beier , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , T Carli , S Caron , F Cassol-Brunner , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , P Fleischmann , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , L Haller , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Malden , E Malinovski , I Malinovski , S Mangano , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , M Swart , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vest , A Vichnevski , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , D Wegener , C Werner , N Werner , M Wessels , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2002) Search for QCD instanton-induced processes in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 25: 4. 495-509 NOV Abstract: Signals of QCD instanton-induced processes are searched for in deep-inelastic scattering (DIS) at the electron-proton collider HERA in a kinematic region defined by the Bjorken-scaling variables x > 10(-3), 0.1 < y < 0.6 and photon virtualities 10 less than or similar to Q(2) < 100 GeV2. Several observables characterising hadronic final state properties of QCD instanton-induced events are exploited to identify a potentially instanton-enriched domain. While an excess of events with instanton-like topology is observed it cannot be claimed significant given the uncertainty of the standard DIS background simulation. Upper limits on the cross-section for instanton-induced processes of between 60 pb and 1000 pb are set dependent on the kinematic domain considered. The data do not exclude the cross-section predicted by instanton perturbation theory for small instanton sizes. At large instanton sizes a naive extrapolation of instanton perturbation theory yields a cross-section in the range of sensitivity of this study. Such a cross-section is not observed, in agreement with non-perturbative lattice simulations of the QCD vacuum.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , J Becker , A Beglarian , O Behnke , C Beier , A Belousov , C Berger , T Berndt , J C Bizot , J Bhome , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , J Burger , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , P Fleischmann , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , J Haller , W J Haynes , B Heinemann , G Heinzelmann , R C Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovannsyan , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , H Krehbiel , J Kroseberg , K Kruger , T Kuhr , T Kurca , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , S Mangano , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , U Straumann , M Swart , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , M Weber , D Wegener , C Werner , N Werner , M Wessels , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , N Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2002) Measurement of dijet cross sections in photoproduction at HERA EUROPEAN PHYSICAL JOURNAL C 25: 1. 13-23 SEP Abstract: Dijet cross sections as functions of several jet observables are measured in photoproduction using the HI detector at HERA. The data sample comprises e(+)p data with an integrated luminosity of 319 pb(-1). Jets are selected using the inclusive k(perpendicular to) algorithm with a minimum transverse energy of 25 GeV for the leading jet. The phase space covers longitudinal proton momentum fraction x(p) and photon longitudinal momentum fraction x(gamma) in the ranges 0.05 < x(p) < 0.6 and 0.1 < x(gamma) < 1. The predict ions of next-to-leading order perturbative QCD, including recent photon and proton parton densities, are found to be compatible with the data in a wide kinematical range.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , J Becker , A Beglarian , O Behnke , C Beier , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , J Burger , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , J Cao , S Caron , F Cassol-Brunner , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , A Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , T Golling , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , J Haller , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schooning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , U Straumann , M Swart , M Tasevsky , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , M Vorobiev , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , M Weber , D Wegener , C Werner , M Werner , N Werner , M Wessels , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2002) Search for odderon-induced contributions to exclusive pi(0) photoproduction at HERA PHYSICS LETTERS B 544: 1-2. 35-43 SEP 19 Abstract: A search for contributions to the reaction ep --> epi(0)N* from photon-odderon fusion in the photoproduction regime at HERA is reported, at an average photon-proton centre-of-mass energy <W> = 215 GeV. The measurement proceeds via detection of the pi(0) decay photons, a leading neutron from the N* decay, and the scattered electron. No pi(0) signal is observed and an upper limit on the cross section for the photon-odderon fusion process of sigma(gammap --> pi(0)N*) < 49 nb at the 95% confidence level is derived, integrated over the experimentally accessible range of the squared four-momentum transfer at the nucleon vertex 0.02 < \t\ < 0.3 GeV2. This excludes a recent prediction from a calculation based on a non-perturbative QCD model of a photon-odderon fusion cross section above 200 nb. (C) 2002 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , A Beglarian , O Behnke , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , D Bruncko , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Ermann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , P Fleischmann , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , J Haller , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henshel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , J Katzy , F Keil , N Keller , J Kennedy , I R Kenyon , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Koya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , J Kroseberg , K Kruger , T Kuhr , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Malden , E Malinovski , S Mangano , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , S Michine , S Mikocki , D Milstead , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , P R Newmann , F Niebergall , C Niebuhr , O Nix , G Nowak , M Nozicka , B Olivier , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Tschorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , S Tchetchelnitski , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , A V Trevino , S Vassiliev , Y Vazdik , C Veelken , A Vest , A Vichnevski , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , D Wegener , C Werner , N Werner , M Wessels , G White , S Weisand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer (2002) Search for excited electrons at HERA PHYSICS LETTERS B 548: 1-2. 35-44 NOV 14 Abstract: A search for excited electron (e*) production is described in which the electroweak decays e* --> egamma, e* --> eZ and e* ---> nuW are considered. The data used correspond to an integrated luminosity of 120 pb(-1) taken in e(+/-)p collisions from 1994 to 2000 with the H1 detector at HERA at centre-of-mass energies of 300 and 318 GeV. No evidence for a signal is found. Mass dependent exclusion limits are derived for the ratio of the couplings to the compositeness scale, f/A. These limits extend the excluded region to higher masses than has been possible in previous direct searches for excited electrons. (C) 2002 Published by Elsevier Science B.V.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , J Becker , M Beckingham , A Beglarian , O Behnke , C Beier , A Belousov , C Berger , T Berndt , J C Bizot , J Boehme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleisclier , P Fleischmann , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Frising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , J Haller , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , I Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , J Kroseberg , K Kruger , T Kuhr , T Kurca , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Malden , E Malinovski , I Malinovski , S Mangano , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Shenakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , M Swart , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vest , A Vichnevski , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , D Wegener , C Werner , N Werner , M Wessels , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2002) Inelastic leptoproduction of J/psi mesons at HERA EUROPEAN PHYSICAL JOURNAL C 25: 1. 41-53 SEP Abstract: The leptoproduction of J/psi mesons is studied in inelastic reactions for four momentorri transfers 2 < Q(2) < 100GeV(2). The data were taken with the H1 detector at the electron proton collider HERA and correspond to an integrated luminosity of 77 pb(-1). Single differential and double differential cross sections are measured with increased precision compared with previous analyses. New leading order calculations within the non-relativistic QCD factorisation approach including colour octet and colour singlet contributions are compared with the data and are found to give a reasonable description of most distributions. An exception is the shape of the distribution in the J/psi fractional energy. z, which deviates significantly from that of the data. Comparisons with photoproduction are made and the polarisation of the produced J/psi meson is analysed.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , S Baumgartner , J Becker , M Beckingham , A Beglarian , O Behnke , C Beier , A Belousov , C Berger , T Berndt , J C Bizot , J Bohme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , S Caron , F Cassol-Brunner , D Clarke , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleisher , P Fleischmann , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , G Prising , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , C Grab , V Grabski , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , J Haller , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , A Hovhannisyan , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , J Kroseberg , K Kruger , T Kuhr , T Kurca , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Lokuionova , V Lubimov , S Luders , D Luke , L Lytkin , N Malden , E Malinovski , I Malinovski , S Mangano , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , F Niebergall , C Niebuhr , O Nix , G Nowak , M Nozicka , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , A Petrukhin , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , G Radel , J Rauschenberger , P Reimer , B Reisert , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , S Schatzel , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , I Strauch , U Straumann , M Swart , S Tchetchelnitski , G Thompson , P D Thompson , F Tomasz , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Uraev , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vest , A Vichnevski , K Wacker , J Wagner , R Wallny , B Waugh , G Weber , D Wegener , C Werner , N Werner , M Wessels , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , M zur Nedden (2002) Inelastic photoproduction of J/psi mesons at HERA EUROPEAN PHYSICAL JOURNAL C 25: 1. 25-39 SEP Abstract: An analysis of inelastic photoproduction of J/psi mesons is presented using data collected at the ep collider HERA corresponding to an integrated luminosity of above 80 pb(-1), Differential and double I < P-t/psi(2) < differential cross sections are measured in a wide kinematic region: 60 < W-gammap < 260 GeV, 1 p(t,psi)(2) < 60 GeV2 and 0.05 < z < 0.9. where z is the fraction of the energy of the exchanged photon transferred to the J/psi meson in the rest frame of the target proton. Cross sections at z less than or similar to 0.3 are presented for the first time. Theoretical calculations within the Colour Singlet Model at NLO for direct photon processes are shown to give a good description of the data in the medium z region (0.3 < z < 0.9) up to the highest p(t,psi)(2) values. A calculation using a k(t) factorisation approach in LO in the Colour Singlet Model is also able to describe these data. The data in the full z range are also compared to LO calculations within a non-relativistic QCD framework including colour octet and colour singlet contributions for direct and resolved photons. It seems possible to reconcile data and theory with modest contributions from colour octet processes. The polarisation of the J/psi meson is measured as a function of z and p(t,psi) and is reasonably described by the theoretical predictions.
Notes:
2001
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , P Bate , J Becker , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , T Berndt , J C Bizot , J Boehme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , J Burger , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , J Cao , S Caron , F Cassol-Brunner , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , J Haller , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , R Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , U Straumann , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , K Wacker , R Wallny , B Waugh , G Weber , M Weber , D Wegener , C Werner , M Werner , N Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2001) D*(+/-) meson production in deep-inelastic diffractive interactions at HERA PHYSICS LETTERS B 520: 3-4. 191-203 NOV 15 Abstract: A measurement is presented of the cross section for D*+/- meson production in diffractive deep-inelastic scattering for the first time at HERA. The cross section is given for the process ep --> eXY, where the system X contains at least one D*+/- meson and is separated by a large rapidity gap from a low mass proton remnant system Y. The cross section is presented in the diffractive deep-inelastic region defined by 2 < Q(2) < 100 GeV2, 0.05 < y < 0.7, x(P) < 0.04, M-Y < 1.6 GeV and \t \ < 1 GeV2. The D*+/- mesons are restricted to the range P-T,P-D* > 2 GeV and \ eta (D*)\ < 1.5. The cross section is found to be 246 +/- 54 +/- 56 ph and forms about 6% of the corresponding inclusive D*+/- cross section. The cross section is presented as a function of various kinematic variables, including z(P)(obs) which is an estimate of the fraction of the momentum of the diffractive exchange carried by the parton entering the hard-subprocess. The data show a large component of the cross section at low Z(obs)(P) where the contribution of the boson-gluon-fusion process is expected to dominate. The data are compared with several QCD-based calculations. (C) 2001 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , P Bate , J Becker , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , T Berndt , J C Bizot , J Boehme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , J Burger , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , J Cao , S Caron , F Cassol-Brunner , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , J Haller , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , U Straumann , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , K Wacker , R Wallny , B Waugh , G Weber , M Weber , D Wegener , C Werner , M Werner , N Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2001) On the rise of the proton structure function F-2 towards low x PHYSICS LETTERS B 520: 3-4. 183-190 NOV 15 Abstract: A measurement of the derivative (delta ln F-2/delta ln x)(Q2) equivalent to -lambda (x, Q(2)) of the proton structure function F-2 is presented in the low x domain of deeply inelastic positron-proton scattering. For 5 x 10(-5) less than or equal to x less than or equal to 0.01 and Q(2) greater than or equal to 1.5 GeV2, lambda (x, Q(2)) is found to be independent of x and to increase linearly with ln Q(2). (C) 2001 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , P Bate , J Becker , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , T Berndt , J C Bizot , J Boehme , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , J Burger , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , J Cao , S Caron , F Cassol-Brunner , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , J Haller , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , C Johnson , D P Johnson , M A S Jones , H Jung , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , U Straumann , M Swart , M Tasevsky , V Tchernyshov , S Tchetcheinitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , K Wacker , R Wallny , B Waugh , G Weber , M Weber , D Wegener , C Werner , M Werner , N Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E E Woehrling , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2001) A search for leptoquark bosons in e(-) p collisions at HERA PHYSICS LETTERS B 523: 3-4. 234-242 DEC 27 Abstract: A search for scalar and vector leptoquarks coupling to first generation fermions is performed in the H1 experiment at the ep collider HERA. The analysis uses e-p data collected in 1998 and 1999 at a centre-of-mass energy of 320 GeV, corresponding to an integrated luminosity of similar to 15 pb(-1). No evidence for the direct production of such particles is found in a data sample with a large transverse momentum final state electron or with large missing transverse momentum, and constraints on leptoquark models are established. For a Yukawa coupling of electromagnetic strength leptoquarks are excluded for masses up to similar to 290 GeV. This analysis complements the leptoquark searches performed previously using data collected whilst HERA was operating with positrons instead of electrons. (C) 2001 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , T Berndt , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , D Bruncko , J Burger , F W Busser , A Bunyatyan , A Burrage , G Buschhorn , L Bystritskaya , A J Campbell , J Cao , S Caron , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , T Kluge , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , Y Soloviev , D South , V Spaskov , A Specka , H Spitzer , R Stamen , B Stella , J Stiewe , U Straumann , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , C Wacker , R Wallny , B Waugh , G Weber , M Weber , D Wegener , C Werner , M Werner , N Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2001) Measurement of deeply virtual Compton scattering at HERA PHYSICS LETTERS B 517: 1-2. 47-58 SEP 27 Abstract: A measurement is presented of elastic deeply virtual Compton scattering e(+) + p --> e(+) + gamma + p at HERA using data taken with the H1 detector. The cross section is measured as a function of the photon virtuality, Q(2), and the invariant mass, W, of the gammap system, in the kinematic range 2 < Q(2) < 20GeV(2), 30 < W < 120GeV and \t \ < 1GeV(2), where t is the squared momentum transfer to the proton. The measurement is compared to QCD based calculations. (C) 2001 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , T Berndt , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , E Chabert , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , J D Dowell , A Droutskoi , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , E Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , M W Krasny , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , A Mehta , K Meier , P Merkel , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmitt , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , P Sievers , Y Sirois , T Sloan , P Smirnov , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , M Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2001) Photoproduction with a leading proton at HERA NUCLEAR PHYSICS B 619: 1-3. 3-21 DEC 14 Abstract: The total cross section for the photoproduction process with a leading proton in the final state has been measured at yp centre-of-mass energies W of 91, 181 and 231 GeV. The measured cross sections apply to the kinematic range with the transverse momentum of the scattered proton restricted to P-T less than or equal to 0.2 GeV and 0.68 less than or equal to z less than or equal to 0.88, where z = E'(p)/E-p is the scattered proton energy normalised to the beam energy. The cross section d sigma (gammap-->Xp')(W, z)/dz is observed to be independent of W and z within the measurement errors and amounts to (8.05 +/- 0.06 (stat) +/- 0.89 (syst)) Pb on average. The data are well described by a Triple Regge model in which the process is mediated by a mixture of exchanges with an effective Regge trajectory of intercept alpha (i)(0) = 0.33 +/- 0.04 (stat) +/-0.04 (syst). The total cross section for the interaction of the photon with this mixture (gamma alpha (i) --> X) can be described by an effective trajectory of intercept alpha (k) (0) = 0.99 +/- 0.01 (stat) +/- 0.05 (syst). Predictions based on previous triple Regge analyses of pp --> pX data assuming vertex factorisation are broadly consistent with the yp data. The measured cross sections are compared with deep inelastic scattering leading proton data in the same region of z and p(T) for photon virtuality Q(2) > 2.5 GeV2. The ratio of the cross section for leading proton production to the total cross section is found to rise with Q(2). (C) 2001 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , T Berndt , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , D Clarke , B Clerbaux , C Collard , G J Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , W J Haynes , B Heinemann , G Heinzelmann , A Heister , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , M W Krasny , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , P Merkel , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , M Werner , N Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2001) Three-jet production in deep-inelastic scattering at HERA PHYSICS LETTERS B 515: 1-2. 17-29 AUG 23 Abstract: Three-jet production is studied for the first time in deep-inelastic positron-proton scattering. The measurement carried out with the H1 detector at HERA covers a large range of four-momentum transfer squared 5 < Q(2) < 5000 GeV2 and invariant three-jet masses 25 < M-3jet less than or similar to 140 GeV. Jets are defined by the inclusive k(perpendicular to) algorithm in the Breit frame. The size of the three-jet cross section and the ratio of the three-jet to the dijet cross section R-3/2 are described over the whole phase space by the predictions of perturbative QCD in next-to-leading order. The shapes of angular jet distributions deviate significantly from a uniform population of the available phase space but are well described by the QCD calculation. (C) 2001 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , T Berndt , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , E Chabert , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , J D Dowell , A Droutskoi , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , J P Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , M W Krasny , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , A Mehta , K Meier , P Merkel , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheims , F P Schilling , P Schleper , D Schmidt , S Schmitt , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , P Sievers , Y Sirois , T Sloan , P Smirnov , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , P D T Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , Y Vazdik , A Vichnevski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , M Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2001) Dijet production in charged and neutral current e(+)p interactions at high Q(2) EUROPEAN PHYSICAL JOURNAL C 19: 3. 429-440 MAR Abstract: Jet production in charged and neutral current events in the kinematic range of Q(2) from 640 to 36 000 GeV2 is studied in deep-inelastic positron-proton scattering at HERA. The measured rate of multijet events and distributions of jet polar angle, transverse energy, dijet mass, and other dijet variables are presented. Using parton densities derived from inclusive DIS cross sections, perturbative QCD calculations ill NLO are found to give a consistent description of both the neutral and charged current dijet production. ii direct, model independent comparison of the jet distributions in charged and neutral current events confirms that the QCD dynamics of the hadronic final state is independent of the underlying electroweak scattering process.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , G Bernardi , T Berndt , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , E Chabert , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , M W Krasny , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , A Mehta , K Meier , P Merkel , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmitt , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , P Sievers , Y Sirois , T Sloan , P Smirnov , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , M Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2001) Measurement of neutral and charged current cross sections electron-proton collisions at high Q(2) EUROPEAN PHYSICAL JOURNAL C 19: 2. 269-288 FEB Abstract: The inclusive e(-)p single and double differential cross sections for neutral and charged current processes are measured with the H1 detector at HERA, in the range of four-momentum transfer squared Q(2) between 150 and 30 000 GeV2, and Bjorken x between 0.002 and 0.65. The data were taken in 1998 and 1999 with a centre-of-mass energy of 320 GeV and correspond to an integrated luminosity of 16.4 pb(-1) The data are compared with recent measurements of the inclusive neutral and charged current e(+)p cross sections. For Q(2) > 1000 GeV2 clear evidence is observed for an asymmetry between e(+)p and e(-)p neutral current scattering and the generalised structure functions x (F) over tilde (3) is extracted for the first time at HERA. A fit to the charged current data is used to extract a value for the W boson propagator mass. The data are found to be in good agreement with Standard Model predictions.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , S Bartel , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , T Berndt , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , S Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , E Chabert , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , J D Dowell , A Droutskoi , D Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Crab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , N Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , A Jung , H K Kastli , D Kant , I Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , M W Krasny , R Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , A Mehta , K Meier , P Merkel , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , C Risler , E Rizvi , P Robmann , K Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmitt , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , P Sievers , Y Sirois , T Sloan , P Smirnov , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , M Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , A C Wyatt , H Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2001) Diffractive jet production in deep-inelastic e(+)p collisions at HERA EUROPEAN PHYSICAL JOURNAL C 20: 1. 29-49 APR Abstract: A measurement is presented of dijet and 3-jet cross sections in low-\t\ diffractive deep-inelastic scattering interactions of the type ep --> eXY, where the system X is separated by a large rapidity gap from a low-mass baryonic system Y. Data taken with the H1 detector at HERA, corresponding to an integrated luminosity of 18.0 pb(-1), are used to measure hadron level single and double differential cross sections for 4 < Q(2) < 80 GeV2, z(p) < 0.05 and pT,(jet) > 4 GeV. The energy flow not attributed to jets is also investigated. The measurements are consistent with a factorising diffractive exchange with trajectory intercept close to 1.2 and tightly; constrain the dominating diffractive gluon distribution. Viewed in terms of the diffractive scattering of partonic fluctuations of the photon, the data require the dominance of q (q) over barq over q (q) over bar states. Soft colour neutralisation models in their present form cannot simultaneously reproduce the shapes and the normalisations of the differential cross sections. Models based on 2-gluon exchange are able to reproduce the shapes of the cross sections at low x(p) values.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , G Bernardi , T Berndt , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , E Chabert , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , J D Dowell , A Droutskoi , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , W Hoprich , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , M W Krasny , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , A Mehta , K Meier , P Merkel , F Metlica , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmitt , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , P Sievers , Y Sirois , T Sloan , P Smirnov , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , S von Dombrowski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , M Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2001) Measurement and QCD analysis of jet cross sections in deep-inelastic positron-proton collisions at root s of 300 GeV EUROPEAN PHYSICAL JOURNAL C 19: 2. 289-311 FEB Abstract: Jet production is studied in the Breit frame in deep-inelastic positron-proton scattering over a large range of four-momentum transfers 5 < Q(2) < 15 000 GeV2 and transverse jet energies 7 < E-T < 60 GeV. The analysis is based on data corresponding to an integrated luminosity of L-int similar or equal to 33 pb(-1) taken in the years 1995-1997 with the H1 detector at HERA at a center-of-mass energy roots = 300 GeV. Dijet and inclusive jet cross sections are measured multi-differentially using k(perpendicular to) and angular ordered jet algorithms. The results are compared to the predictions of perturbative QCD calculations in next-to-leading order in the strong coupling constant alpha (s). QCD fits are performed in which alpha (s) and the gluon density in the proton are determined separately. The gluon density is found to be in good agreement with results obtained in other analyses using data from different processes. The strong coupling constant is determined to be alpha (s) (M-Z) = 0.1186 +/- 0.0059. In addition an analysis of the data in which both alpha (s) and the gluon density are determined simultaneously is presented.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , G Bernardi , T Berndt , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , J Dingfelder , P Dixon , V Dodonov , J D Dowell , A Droutskoi , A Dubak , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , C Gerlich , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , P Kjellberg , M Klein , C Kleinwort , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , P Laycock , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , L Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , D Meer , A Mehta , K Meier , P Merkel , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , M Peez , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmitt , M Schneider , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , Y Sirois , T Sloan , P Smirnov , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , M Werner , N Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2001) Searches at HERA for squarks in R-parity violating supersymmetry EUROPEAN PHYSICAL JOURNAL C 20: 4. 639-657 MAY Abstract: A search for squarks in R-parity violating supersymmetry is performed in e(+)p collisions at HERA at a centre of mass energy of 300 GeV, using HI data corresponding to an integrated luminosity of 37 pb(-1). The direct production of single squarks of any generation in positron-quark fusion via a Yukawa coupling lambda' is considered, taking into account R-parity violating and conserving decays of the squarks. No significant deviation from the Standard Model expectation is found. The results are interpreted in terms of constraints within the minimal Supersymmetric Standard Model (MSSM), the constrained MSSM and the minimal Supergravity model, and their sensitivity to the model parameters is studied in detail. For a Yukawa coupling of electromagnetic strength, squark masses below 260 GeV are excluded at 95% confidence level in a large part of the parameter space. For a 100 times smaller coupling strength masses up to 182 GeV are excluded.
Notes:
C Adloff , V Andreev , B Andrieu , T Anthonis , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Bergen , G Bernardi , T Berndt , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , E Chabert , D Clarke , B Clerbaux , C Collard , J G Contreras , Y R Coppens , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , J D Dowell , A Droutskoi , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , A Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , Y H Fleming , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hildebrandt , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , W Hoprich , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , R Koutouev , A Koutov , M W Krasny , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , A Loginov , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , A Mehta , K Meier , P Merkel , F Metlica , A B Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , C Risler , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmitt , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , C Schwanenberger , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , P Sievers , Y Sirois , T Sloan , P Smirnov , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , I Tsurin , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , S Vassiliev , Y Vazdik , A Vichnevski , S von Dombrowski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , M Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2001) Deep-inelastic inclusive ep scattering at low x and a determination of alpha(s) EUROPEAN PHYSICAL JOURNAL C 21: 1. 33-61 JUN Abstract: A precise measurement of the inclusive deep-inelastic c(+)p scattering cross section is reported in the kinematic range 1.5 less than or equal to Q(2) less than or equal to 150 GeV2 and 3.10(-5) less than or equal to x less than or equal to 0.2. The data were recorded with the H1 detector at HERA in 1996 and 1997, and correspond to an integrated luminosity of 20 pb(-1). The double differential cross section, from which the proton structure function F-2 (x, Q(2)) and the longitudinal structure function FL (x, Q2) are extracted, is measured with typically 1% statistical and 3% systematic uncertainties. The measured derivative (partial derivativeF(2) (x, Q(2))/partial derivative ln Q(2))(x) is observed to rise continuously towards small x for fixed Q(2). The cross section data are combined with published III measurements at high Q2 for a next-to-leading order DGLAP QCD analysis. The H1 data determine the gluon momentum distribution in the range 3.10(-4) less than or equal to x less than or equal to 0.1 to within an experimental accuracy of about 3% for Q(2) = 20 GeV2. A fit of the H1 measurements and the mup data of the BCDMS collaboration allows the strong coupling constant alpha (s) and the gluon distribution to be simultaneously determined. A value of alpha (s)(M-Z(2)) = 0.1150 +/-0.0017(exp)(-0.0005)(+0.0009) (model) is obtained in NLO, with an additional theoretical uncertainty of about +/-0.005, mainly due to the uncertainty of the renormalisation scale.
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2000
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , R Barschke , T Bartel , U Bassler , M Beck , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , R Beyer , P Biddulph , J C Bizot , K Borras , V Boudry , S Bourov , A Braemer , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , C Brune , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , T R Ebert , G Eckerlin , T Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , K Graissler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , J Janoth , D M Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , M Karlsson , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , K Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , J Lipinski , B List , G Lobo , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , H Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , R P Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schiek , S Schleif , W von Schlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , K Stolze , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , J Zalesak , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , P Van Mechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (2000) Di-jet event rates in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 13: 3. 415-426 APR Abstract: Di-jet event rates have been measured for deep-inelastic scattering in the kinematic domain 5 less than or similar to Q(2) less than or similar to 100 GeV2 and 10(-4) less than or similar to xBj less than or similar to 10(-2), and for jet transverse moments squared p(t)(*2) greater than or similar to Q(2). The analysis is based on data collected with the H1 detector at HERA in 1994 corresponding to an integrated luminosity of about 2 pb(-1). Jets are defined using a cone algorithm in the photon-proton centre of mass system requiring jet transverse momenta of at least 5 GeV. The di-jet event rates are shown as a function of Q(2) and x(Bj). Leading order models of point-like interacting photons fail to describe the data. Models which add resolved interacting photons or which implement the colour dipole model give a good description of the di-jet event rate. This is also the case for next-to-leading order calculations including contributions from direct and resolved photons.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , S Burke , A Burrage , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , R Demirchyan , C Diaconu , M Dirkmann , P Dixon , V Dodonov , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , S Ferron , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , K Hewitt , M Hilgers , K H Hiller , C D Hilton , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , L Jonsson , D P Johnson , M Jones , H Jung , H K Kastli , M Kander , D Kant , M Kapichine , M Karlsson , O Karschnick , O Kaufmann , M Kausch , F Keil , N Keller , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , K Kruger , A Kupper , H Kuster , M Kuhlen , T Kurca , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , R Lemrani , V Lendermann , S Levonian , M Lindstroem , G Lobo , E Lobodzinska , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , V Panassik , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , I Potashnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , T Schorner , V Schroder , H C Schultz-Coulon , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , F Squinabol , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , R Todenhagen , D Traynor , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zur Nedden (2000) Measurement of neutral and charged current cross-sections in positron-proton collisions at large momentum transfer EUROPEAN PHYSICAL JOURNAL C 13: 4. 609-639 APR Abstract: The inclusive single and double differential cross-sections for neutral and charged charged processes with four-momentum transfer squared Q(2) between 150 and 30 000 GeV2 and with Bjorken x between 0.0032 and 0.65 are measured in e(+)p collisions. The data were taken with the H1 detector at HERA between 1994 and 1997. and they correspond to an integrated luminosity of 35.6 pb(-1). Tho Q(2) evolution of the parton densities of the proton is tested, yielding no significant deviation from the prediction of perturbative QCD. The proton structure function Fz(x, Q(2)) is determined. All extraction of the u and d quark distributions at high x is presented. At high Q(2) electroweak effects of the heavy bosons Z(o) and W are observed and found to be consistent with Standard Model expectation.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , T Bartel , U Bassler , P Bate , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Buniatian , S Burke , A Burrage , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , J Chyla , D Clarke , B Clerbaux , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , R Demirchyan , C Diaconu , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , L Jonsson , D P Johnson , M Jones , H Jung , H K Kastli , M Kander , D Kant , M Kapichine , M Karlsson , O Karschnik , J Katzy , O Kaufmann , M Kausch , N Keller , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , K Kruger , A Kupper , H Kuster , M Kuhlen , T Kurca , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , R Lemrani , V Lendermann , S Levonian , M Lindstroem , G Lobo , E Lobodzinska , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , R Mohr , S Mohrdieck , M Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , V Panassik , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , J Rauschenberger , P Reimer , B Reisert , D Reyna , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , V Schroder , H C Schultz-Coulon , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , F Squinabol , R Stamen , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , D Traynor , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , A Van Haecke , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , G White , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wissing , C Wittek , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zur Nedden (2000) Measurement of dijet cross-sections in low Q(2) ep collisions and the extraction of an effective parton density for the virtual photon EUROPEAN PHYSICAL JOURNAL C 13: 3. 397-414 APR Abstract: The triple-differential dijet cross-section, d(3)sigma(ep)/dQ(2)d (E) over bar(t)(2) dx(gamma)(jets), is measured with the H1 detector at HERA as a function of the photon virtuality the fraction of the photon's momentum carried by the parton entering the hard scattering, x(gamma)(jets), and the square of the mean transverse energy, (E) over bar(t)(2), of the two highest E-t jets. Jets are found using a longitudinal boost-invariant k(T) clustering algorithm in the gamma*p center of mass frame. The measurements cover the ranges 1.6 < Q(2) < 80 GeV2 in virtuality and 0.1 < y < 0.7 in inelasticity y. The results are well described by leading order QCD models which include the effects of a resolved component to the virtual photon. Models which treat the photon as point-like fail to describe the data. An effective leading order parton density for the virtual photon is extracted as a function of the photon virtuality, the probing scale and the parton momentum fraction. The a:, and probing scale dependences of the parton density show characteristic features of photon structure, and a suppression of this structure with increasing Q(2) is seen.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , S Burke , A Burrage , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , R Demirchyan , C Diaconu , M Dirkmann , P Dixon , V Dodonov , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , S Ferron , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , K Hewitt , M Hilgers , K H Hiller , C D Hilton , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , L Jonsson , D P Johnson , M Jones , H Jung , H K Kastli , M Kander , D Kant , M Kapichine , M Karlsson , O Karschnick , O Kaufmann , M Kausch , F Keil , N Keller , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , K Kruger , A Kupper , H Kuster , M Kuhlen , T Kurca , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , R Lemrani , V Lendermann , S Levonian , M Lindstroem , G Lobo , E Lobodzinska , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , V Panassik , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , I Potashnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , T Schorner , V Schroder , H C Schultz-Coulon , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , F Squinabol , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , R Todenhagen , D Traynor , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , A Van Haecke , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zur Nedden (2000) Measurements of transverse energy flow in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 12: 4. 595-607 FEB Abstract: Measurements of transverse energy flow are presented for neutral current deep-inelastic scattering events produced in positron-proton collisions at HERA. the kinematic range covers squared momentum transfers Q(2) from 3.2 to 2 200 GeV2. the Bjorken scaling variable x from 8 . 10(-5) to 0.11 and the hadronic mass W from 66 to 233 GeV. The transverse energy flow is measured in the hadronic centre of mass frame and is studied as a function of Q(2). x, W and pseudorapidity. A comparison is made with QCD-based models. The behaviour of the mean transverse energy in tbe central pseudorapidity region and an interval corresponding to the photon fragmentation region are analysed as a function of Q(2) and W.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , J C Bizot , K Borras , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , E Chabert , D Clarke , B Clerbaux , C Collard , J G Contreras , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , K T Donovan , J D Dowell , A Droutskoi , C Duprel , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , F Ferrarotto , S Ferron , M Fleischer , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hilgers , K H Hiller , C D Hilton , J Hladky , P Hoting , D Hoffmann , W Hoprich , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , O Kaufmann , M Kausch , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , B Koblitz , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , M W Krasny , H Krehbiel , J Kroseberg , D Krucker , K Kruger , A Kupper , T Kuhr , T Kurca , R Kutuev , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , G Lobo , E Lobodzinska , B Lobodzinski , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , P Sievers , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , S von Dombrowski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2000) Search for compositeness, leptoquarks and large extra dimensions in eq contact interactions at HERA PHYSICS LETTERS B 479: 4. 358-370 APR 27 Abstract: The reaction e(+)p --> e(+)X is studied with the H1 detector at HERA. The data cover momentum transfers Q(2) between 200 GeV2 and 30 000 GeV2 and correspond to an integrated luminosity of 35.6 pb(-1). The differential cross section d sigma/dQ(2) is compared to the Standard Model expectation for neutral current scattering and analysed to search for ((e) over bar e)((q) over bar q) contact interactions. No evidence for new phenomena is observed. The results are used to set limits on scales within models of electron-quark compositeness, quark form factors and the exchange of virtual heavy leptoquarks. A search for gravitational effects mediated through the exchange of virtual gravitons which propagate into large extra dimensions is presented. (C) 2000 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Buniatian , S Burke , A Burrage , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , R Demirchyan , C Diaconu , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , L Jonsson , D P Johnson , M Jones , H Jung , H K Kastli , M Kander , D Kant , M Kapichine , M Karlsson , O Karschnik , J Katzy , O Kaufmann , M Kausch , N Keller , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , K Kruger , A Kupper , H Kuster , M Kuhlen , T Kurca , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , R Lemrani , V Lendermann , S Levonian , M Lindstroem , G Lobo , E Lobodzinska , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , R Mohr , S Mohrdieck , M Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , V Panassik , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , J Rauschenberger , P Reimer , B Reisert , D Reyna , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , V Schroder , H C Schultz-Coulon , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , F Squinabol , R Stamen , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , D Traynor , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , A Van Haecke , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , G White , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wissing , C Wittek , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zur Nedden (2000) Elastic electroproduction of rho mesons at HERA EUROPEAN PHYSICAL JOURNAL C 13: 3. 371-396 APR Abstract: The elastic electroproduction of rho mesons is studied at HERA with the H1 detector for a photon virtuality in the range 1 < Q(2) < 60 GeV2 and for a hadronic centre of mass energy in the range 30 < W < 140 GeV. The shape of the (pi pi) mass distribution in the rho resonance region is measured as a function of Q(2). The full set of rho spin density matrix elements is determined, and evidence is found for a helicity flip amplitude at the level of 8 +/- 3% of the non-flip amplitudes. Measurements are presented of the dependence of the cross section on Q(2), W and t (the four-momentum transfer squared to the proton). They suggest that, especially at large Q(2), the gamma*p cross section develops a stronger W dependence than that expected from the behaviour of elastic and total hadron-hadron cross sections.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , G Bernardi , T Berndt , J C Bizot , K Borras , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , E Chabert , D Clarke , B Clerbaux , C Collard , J G Contreras , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , J D Dowell , A Droutskoi , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , T Hauschildt , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hilgers , K H Hiller , C D Hilton , J Hladky , P Hoting , D Hoffmann , W Hoprich , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , O Kaufmann , M Kausch , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , B Koblitz , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , M W Krasny , H Krehbiel , J Kroseberg , D Krucker , K Kruger , A Kupper , T Kuhr , T Kurca , R Kutuev , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , B List , E Lobodzinska , B Lobodzinski , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Neibuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Sheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , P Sievers , Y Sirois , T Sloan , P Smirnov , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , S von Dombrowski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , Wegner , T Wengler , M Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2000) Elastic photoproduction of J/psi and gamma mesons at HERA PHYSICS LETTERS B 483: 1-3. 23-35 JUN 15 Abstract: Cross sections for elastic photoproduction of J/psi and Y mesons are presented. For J/psi mesons the dependence on the photon-proton centre-of-mass energy W-gamma p is analysed in an extended range with respect to previous measurements of 26 less than or equal to W-gamma p less than or equal to 2.85 GeV. The measured energy dependence is parameterized as sigma(gamma p) proportional to W-gamma p(delta) with delta = 0.83 +/- 0.07. The vp UP YP differential cross section d sigma/dt for J/psi mesons is derived, its dependence on W-gamma p and on t is analysed and the effective trajectory (in terms of Regge theory) is determined to be alpha(t) = (1.27 +/- 0.05) + (0.08 +/- 0.17) . t/GeV2. Models based on perturbative QCD and on pomeron exchange are compared to the data. (C) 2000 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , O Behnke , C Beier , A Belousov , T Benisch , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , P Biddulph , J C Bizot , K Borras , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , S Burke , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , C Collard , J G Contreras , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , B Delcourt , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , K T Donovan , J D Dowell , A Droutskoi , C Duprel , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , A B Fahr , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , S Ferron , M Fleischer , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hilgers , K H Hiller , C D Hilton , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , L Jonsson , D P Johnson , M Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , O Kaufmann , M Kausch , F Keil , N Keller , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , M W Krasny , H Krehbiel , J Kroseberg , D Krucker , K Kruger , A Kupper , T Kuhr , T Kurca , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , A Lebedev , F Lehner , V Lemaitre , R Lemrani , V Lendermann , S Levonian , M Lindstroem , G Lobo , E Lobodzinska , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , S Passaggio , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potashnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , T Schorner , A Schoning , V Schroder , H C Schultz-Coulon , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , P Sievers , Y Sirois , T T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Valee , P Van Mechelen , Y Vazdik , G Villet , S von Dombrowski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zur Nedden (2000) Investigation of power corrections to event shape variables measured in deep-inelastic scattering EUROPEAN PHYSICAL JOURNAL C 14: 2. 255-269 MAY Abstract: Deep-inelastic ep scattering data, taken with the H1 detector at HERA, are used to study the event shape variables thrust, jet broadening, jet mass, C parameter and two kinds of differential two-jet rate. The data cover a large range of the four-momentum transfer Q, which is considered to be the relevant energy scale, between 7GeV and 100 GeV. The Q dependences of the mean values are compared with second order calculations of perturbative QCD applying power law corrections proportional to 1/Q(p) to account for hadronization effects. The concept of power corrections is investigated by fitting simultaneously a non-perturbative parameter <(alpha)over bar>(p-1) and the strong coupling constant a,.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , J C Bizot , K Borras , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , E Chabert , D Clarke , B Clerbaux , C Collard , J G Contreras , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , K T Donovan , J D Dowell , A Droutskoi , C Duprel , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , F Ferrarotto , S Ferron , M Fleischer , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hilgers , K H Hiller , C D Hilton , J Hladky , P Hoting , D Hoffmann , W Hoprich , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , O Kaufmann , M Kausch , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , B Koblitz , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , M W Krasny , H Krehbiel , J Kroseberg , D Krucker , K Kruger , A Kupper , T Kuhr , T Kurca , R Kutuev , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , A Lebedev , B Leissner , V Lemaitre , R Lemrani , V Lendermann , S Levonian , M Lindstroem , G Lobo , E Lobodzinska , B Lobodzinski , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , S Passaggio , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , P Sievers , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , S von Dombrowski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2000) Inclusive photoproduction of neutral pions in the photon hemisphere at HERA EUROPEAN PHYSICAL JOURNAL C 18: 2. 293-302 DEC Abstract: The inclusive cross section for the photoproduction of neutral pious has been measured as a function of the transverse momentum, rapidity, and Feynman x of the pi (0) mesons at an average photon-proton centre-of-mass energy of 208 GeV and for photon virtualities below Q(2) = 0.01 GeV2. The pi (0) measurement extends the range covered by previous charged particle measurements at HERA by two units of rapidity in the photon direction down to a value of -5.5 in the gammap centre-of-mass frame. The pi (0) transverse momentum distribution is well described over the whole measured range by a power law ansatz, while an exponential fit falls below the data at transverse momentum values above 1.5 GeV/c. Good agreement with the predictions of the Monte Carlo models PYTHIA and PHOJET is found. In the context of the PYTHIA model the data are inconsistent with large intrinsic transverse momentum values in the photon.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , G Bernardi , T Berndt , J C Bizot , K Borras , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , E Chabert , D Clarke , B Clerbaux , C Collard , J G Contreras , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , J D Dowell , A Droutskoi , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , W Hoprich , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , O Kaufmann , M Kausch , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , M W Krasny , H Krehbiel , J Kroseberg , D Krucker , K Kruger , A Kupper , T Kuhr , T Kurca , R Kutuev , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , E Lobodzinska , B Lobodzinski , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , A Mehta , K Meier , P Merkel , F Metlica , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , P Sievers , Y Sirois , T Sloan , P Smirnov , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , S von Dombrowski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Warner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2000) Measurement of elastic electroproduction of phi mesons at HERA PHYSICS LETTERS B 483: 4. 360-372 JUN 22 Abstract: The elastic electroproduction of phi mesons is studied at HERA with the H1 detector for photon virtualities 1 < Q(2) < 15 GeV2 and hadronic centre of mass energies 40 < W < 130 GeV. The Q(2) and t dependences of the cross section are extracted (t being the square of the four-momentum transfer to the target proton). When plotted as function of (Q(2) + M-v(2)) and scaled by the appropriate SU(5) quark charge factor, the phi meson cross section agrees within errors with the cross sections of the vector mesons V = rho, omega and J/psi. A detailed analysis is performed of the phi meson polarisation state and the ratio of the production cross sections for longitudinally and transversely polarised phi mesons is determined. A small but significant violation of s-channel helicity conservation (SCKC) is observed. (C) 2000 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , G Bernardi , T Berndt , J C Bizot , K Borras , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , E Chabert , D Clarke , B Clerbaux , C Collard , J G Contreras , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , J D Dowell , A Droutskoi , C Duprel , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , W Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Ferencei , S Ferron , M Fleischer , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , C Grab , H Grassler , T Greenshaw , G Grindhammer , T Hadig , D Haidt , L Hajduk , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hilgers , K H Hiller , J Hladky , P Hoting , D Hoffmann , W Hoprich , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , O Kaufmann , M Kausch , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , B Koblitz , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , M W Krasny , H Krehbiel , J Kroseberg , K Kruger , A Kupper , T Kuhr , T Kurca , R Kutuev , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , E Lebailly , A Lebedev , B Leissner , R Lemrani , V Lendermann , S Levonian , M Lindstroem , E Lobodzinska , B Lobodzinski , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , A Mehta , K Meier , P Merkel , F Metlica , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , G Nellen , P R Newman , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , P Schleper , D Schmidt , S Schmitt , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , P Sievers , Y Sirois , T Sloan , P Smirnov , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , S von Dombrowski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , A C Wyatt , J Zacek , J Zalesak , Z Zhang , A Zhokin , F Zomer , J Zsembery , M zur Nedden (2000) A search for excited fermions at HERA EUROPEAN PHYSICAL JOURNAL C 17: 4. 567-581 NOV Abstract: A search for excited fermions f* of the first generation in e(+)p scattering at the collider HERA is presented using H1 data with an integrated luminosity of 37 pb(-1). All electroweak decays of excited fermions, f* --> f gamma fW, fZ are considered and all possible final states resulting from the Z or W hadronic decays or decays into leptons of the first two generations are taken into account. No evidence for f* production is found. Mass dependent exclusion limits on cross-sections and on the ratio of coupling constants to the compositeness scale are derived.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , J C Bizot , K Borras , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , S Burke , H Burkhardt , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , S Caron , E Chabert , D Clarke , B Clerbaux , C Collard , J G Contreras , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , B Delcourt , N Delerue , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , K T Donovan , J D Dowell , A Droutskoi , C Duprel , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Ellerbrock , E Elsen , M Erdmann , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , S Ferron , M Fleischer , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , C Goodwin , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hilgers , K H Hiller , C D Hilton , J Hladky , P Hoting , D Hoffmann , W Hoprich , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , V Jemanov , L Jonsson , D P Johnson , M A S Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , O Kaufmann , M Kausch , F Keil , N Keller , J Kennedy , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , B Koblitz , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , M W Krasny , H Krehbiel , J Kroseberg , D Krucker , K Kruger , A Kupper , T Kuhr , T Kurca , R Kutuev , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , T Lastovicka , A Lebedev , B Leissner , V Lemaitre , R Lemrani , V Lendermann , S Levonian , M Lindstroem , G Lobo , E Lobodzinska , B Lobodzinski , N Loktionova , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , T Mkrtchyan , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , S Passaggio , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potachnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , A Schoning , T Schorner , V Schroder , H C Schultz-Coulon , K Sedlak , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , P Sievers , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , J Turnau , J E Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Mechelen , Y Vazdik , G Villet , S von Dombrowski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zur Nedden (2000) Measurement of di-jet cross-sections in photoproduction and photon structure PHYSICS LETTERS B 483: 1-3. 36-48 JUN 15 Abstract: The production of hard di-jet events in photoproduction at HERA is dominated by resolved photon processes in which a parton in the photon with momentum fraction x(gamma) is scattered from a parton in the proton. These processes are sensitive to the quark and gluon content of the photon. The differential di-jet cross-section d sigma/dlog(x(gamma)) is presented here, measured in tagged photoproduction at HERA using data taken with the H1 detector, corresponding to an integrated luminosity of 7.2 pb(-1). Using a restricted data sample at high transverse jet energy, E-Y,E-jet > 6 GeV, the effective parton density f(gamma,eff)(x(gamma)) = [q(x(gamma)) + (q) over bar(x(gamma)) + 9/4 g(x(gamma))] in the photon in leading order QCD is measured down to x(gamma) = 0.05 from which the gluon density in the photon is derived. (C) 2000 Elsevier Science B.V. All rights reserved.
Notes:
1999
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , R Demirchyan , C Diaconu , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , D Hoffmann , T Holtom , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , D M Jansen , L Jonsson , D P Johnson , H Jung , H K Kastli , M Kander , D Kant , M Kapichine , M Karlsson , O Karschnik , J Katzy , O Kaufmann , M Kausch , N Keller , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , K Kruger , A Kupper , H Kuster , M Kuhlen , T Kurca , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , R Lemrani , V Lendermann , S Levonian , M Lindstroem , G Lobo , E Lobodzinska , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , S J McMahon , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , R Mohr , S Mohrdieck , M Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , V Panassik , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , J Rauschenberger , P Reimer , B Reisert , D Reyna , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , V Schroder , H C Schultz-Coulon , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , L Sonnenschein , V Spaskov , A Specka , H Spitzer , F Squinabol , R Stamen , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , D Traynor , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , A Van Haecke , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wissing , C Wittek , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zur Nedden (1999) Measurement of internal jet structure in dijet production in deep-inelastic scattering at HERA NUCLEAR PHYSICS B 545: 1-3. 3-20 APR 19 Abstract: Internal jet structure in dijet production in deep-inelastic scattering is measured with the H1 detector at HERA. Jets with transverse energies E-T,E-Breit > 5 GeV are selected in the Breit frame employing k(perpendicular to) and cone jet algorithms. In the kinematic region of squared momentum transfers 10 < Q(2) less than or similar to 120 GeV2 and Bjorken-x values 2 x 10(-4) less than or similar to x(Bj) less than or similar to 8 x 10(-3), jet shapes and subjet multiplicities are measured as a function of a resolution parameter. Distributions of both observables are corrected for detector effects and presented as functions of the transverse jet energy and jet pseudo-rapidity, Dependences of the jet shape and the average number of subjets on the transverse energy and the pseudo-rapidity of the jet are observed. With increasing transverse jet energies and decreasing pseudo-rapidities, i.e, towards the photon hemisphere. the jets are more collimated. QCD models give a fair description of the data. (C) 1999 Elsevier Science B.V.
Notes:
C Adloff , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , M Beck , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , R Demirchyan , C Diaconu , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , D Hoffmann , K Hewitt , K H Hiller , C D Hilton , J Hladky , D Hoffman , T Holtom , R Horisberger , V L Hudgson , S Hurling , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , D M Jansen , L Jonsson , D P Johnson , H Jung , H K Kastli , M Kander , D Kant , M Kapichine , M Karlsson , O Karschnik , J Katzy , O Kaufmann , M Kausch , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , K Kruger , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , V Lendermann , S Levonian , M Lindstroem , B List , G Lobo , E Lobodzinska , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , G Martin , H U Martyn , J Martyniak , S J Maxfield , S J McMahon , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , J Moeck , R Mohr , S Mohrdieck , F Moreau , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , D Nikitin , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , V Panassik , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , J Rauschenberger , P Reimer , B Reisert , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schleif , P Schleper , D Schmidt , L Schoeffel , V Schroder , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , J Spiekermann , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , C Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , A Van Haecke , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1999) Forward jet and particle production at HERA NUCLEAR PHYSICS B 538: 1-2. 3-22 JAN 11 Abstract: Single particles and jets in deeply inelastic scattering at low x are measured with the Hl detector in the region away from the current jet and towards the proton remnant, known as the forward region. Hadronic final stale measurements in this region are expected to be particularly sensitive to QCD evolution effects. Jet cross sections are presented as a function of Bjorken-x for forward jets produced with a polar angle to the proton direction, theta(jet), in the range 7 degrees < theta(jet) < 20 degrees. Azimuthal correlations are studied between the forward jet and the scattered lepton. Charged and neutral single particle production in the forward region are measured as a function of Bjorken-x, in the range 5 degrees < theta < 25 degrees, for particle transverse momenta larger than 1 GeV. QCD based Monte Carlo predictions and analytical calculations based on BFKL, CCFM and DGLAP evolution are compared to the data. Predictions based on the DGLAP approach fail to describe the data, except for those which allow for a resolved photon contribution. (C) 1999 Elsevier Science B.V.
Notes:
C Adloff , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , M Beck , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , W Braunschweig , V Brissson , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burgel , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , A Droutskoi , B Delcourt , C Diaconu , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , M Enzenberger , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , S Hurling , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , D M Jansen , L Jonsson , D P Johnson , H Jung , H K Kastli , M Kander , D Kant , M Kapichine , M Karlsson , O Karschnik , J Katzy , O Kaufmann , M Kausch , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , K Kruger , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , M Lindstroem , B List , G Lobo , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , G Martin , H U Martyn , J Martyniak , S J Maxfield , S J McMahon , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , J Moeck , R Mohr , S Mohrdieck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , D Nikitin , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , V Panassik , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , J Rauschenberger , P Reimer , B Reisert , H Rick , S Riess , E Rizvi , P Robmann , R Rossen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schleif , P Schleper , D Schmidt , L Schoeffel , V Schroder , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , J Spiekermann , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , A Van Haecke , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M ZurNedden (1999) Multi-jet event rates in deep inelastic scattering and determination of the strong coupling constant EUROPEAN PHYSICAL JOURNAL C 6: 4. 575-585 JAN Abstract: Jet event rates in deep inelastic ep scattering at HERA are investigated applying the modified JADE jet algorithm. The data are corrected for detector and hadronization effects and then compared with perturbative QCD predictions using next-to-leading order calculations. The strong coupling constant alpha(s)(M-Z(2)) is determined evaluating the jet event rates. Values of alpha(2)(Q(2)) are extracted in four different bins of the negative squared momentum transfer Q(2) in the range from 40 GeV2 to 4000 GeV2 A combined fit of the renormalization group equation to these several alpha(s)(Q(2)) values results in alpha(s)(M-Z(2)) = 0.117 +/- 0.003 (stat) +/- (0.009)(0.013) (sys) + 0.006 (jet algorithm).
Notes:
C Adloff , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , M Beck , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Buniatian , S Burke , A Burrage , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , R Demirchyan , C Diaconu , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , D M Jansen , L Jonsson , D P Johnson , M Jones , H Jung , H K Kastli , M Kander , D Kant , M Kapichine , M Karlsson , O Karschnik , J Katzy , O Kaufmann , M Kausch , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , K Kruger , A Kupper , H Kuster , M Kuhlen , T Kurca , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , V Lendermann , S Levonian , M Lindstroem , B List , G Lobo , E Lobodzinska , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , G Martin , H U Martyn , J Martyniak , S J Maxfield , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , J Moeck , R Mohr , S Mohrdieck , F Moreau , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , D Nikitin , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , V Panassik , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , J Rauschenberger , P Reimer , B Reisert , D Reyna , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , V Schroder , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , J Spiekermann , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , A Van Haecke , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1999) Measurement of D* meson cross sections at HERA and determination of the gluon density in the proton using NLO QCD NUCLEAR PHYSICS B 545: 1-3. 21-44 APR 19 Abstract: With the H1 detector at the ep collider HERA, D* meson production cross sections have been measured in deep inelastic scattering with four-momentum transfers Q(2) > 2 GeV2 and in photoproduction at energies around W-gamma p approximate to x 88 GeV and 194 GeV, Next-to-Leading Order QCD calculations are found to describe the differential cross sections within theoretical and experimental uncertainties. Using these calculations, the NLO gluon momentum distribution in the proton, x(g)g(x(g)), has been extracted in the momentum fraction range 7.5 x 10(-4) < x(g) < 4 x 10(-2) at average scales mu(2) = 25 to 50 GeV2. The gluon momentum fraction x(g) has been obtained from the measured kinematics of the scattered electron and the D* meson in the final state. The results compare well with the gluon distribution obtained from the analysis of scaling violations of the proton structure function F-2. (C) 1999 Elsevier Science B.V.
Notes:
C Adloff , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , R Demirchyan , C Diaconu , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eicher , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmaan , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , D Hoffmann , T Holtom , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , D M Jansen , L Jonsson , D P Johnson , H Jung , H K Kastli , M Kander , D Kant , M Kapichine , M Karlsson , O Karschnik , J Katzy , O Kaufmann , M Kausch , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , K Kruger , A Kupper , H Kuster , M Kuhlen , T Kurca , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , V Lendermann , S Levonian , M Lindstroem , B List , G Lobo , E Lobodzinska , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , G Martin , H U Martyn , J Martyniak , S J Maxfield , S J McMahon , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , J Moeck , R Mohr , S Mohrdieck , F Moreau , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , D Nikitin , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , V Panassik , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , J Rauschenberger , P Reimer , B Reisert , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , V Schroder , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , J Spiekermann , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , A Van Haecke , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1999) Measurement of leading proton and neutron production in deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 6: 4. 587-602 JAN Abstract: Deep-inelastic scattering events with a leading baryon have been detected by the I-IL experiment at HERA using a forward proton spectrometer and a forward neutron calorimeter. Semi-inclusive cross sections have been measured in the kinematic region 2 less than or equal to Q(2) less than or equal to 50GeV(2), 6 x 10(-5) less than or equal to x less than or equal to 6 x 10(-3) and baryon p(T) less than or equal to 200 MeV, for events with a final-state proton with energy 580 less than or equal to E' less than or equal to 740 GeV, or a neutron with energy E' greater than or equal to 160 GeV. The measurements are used to test production models and factorization hypotheses. A Regge model of leading baryon production which consists of pion, pomeron and secondary reggeon exchanges gives an acceptable description of both semi-inclusive cross sections in the region 0.7 less than or equal to E'/E-p less than or equal to 0.9, where E-p is the proton beam energy. The leading neutron data are used to estimate for the first time the structure function of the pion at small Bjorken-x.
Notes:
C Adloff , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , P Bate , M Beck , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , A Braemer , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , R Demirchyan , C Diaconu , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , S Hurling , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , D M Jansen , L Jonsson , D P Johnson , H Jung , H C Kaestli , M Kander , D Kant , M Karlsson , U Kathage , J Katzy , O Kaufmann , M Kausch , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , B List , G Lobo , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , G Martin , H U Martyn , J Martyniak , S J Maxfield , S J McMahon , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , J Moeck , R Mohr , S Mohrdieck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , P Reimer , B Reisert , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schiek , S Schleif , P Schleper , D Schmidt , G Schmidt , L Schoeffel , V Schroder , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1999) Diffractive dijet production at HERA EUROPEAN PHYSICAL JOURNAL C 6: 3. 421-436 JAN Abstract: Interactions of the type ep --> eXY are studied, where the component X of the hadronic final state contains two jets and is well separated in rapidity from a leading baryonic system Y. Analyses are performed of both resolved and direct photoproduction and of deep-inelastic scattering with photon virtualities in the range 7.5 < Q(2) < 80 GeV2. Cross sections are presented where Y has mass M-y < 1.6 GeV, the squared four-momentum transferred at the proton vertex satisfies \t\ < 1 GcV(2) and the two jets each have transverse momentum p(T)(jet) > 5 GeV relative to the photon direction in the rest frame of X. Models based on a factorisable diffractive exchange with a gluon dominated structure, evolved to a scale set by the transverse momentum (p) over cap(T) of the outgoing partons front the hard interaction. give good descriptions of the data. Exclusive q (q) over bar production, as calculated in perturbative QCD using the squared proton gluon density, represents at most a small fraction of the measured cross section. The compatibility of the data with a breaking of diffractive factorisation due to spectator interactions in resolved photoproduction is investigated.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , P Biddulph , J C Bizot , K Borras , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , S Burke , A Burrage , G Buschhorn , A J Campbell , J Cao , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , C Collard , J G Contreras , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , B Delcourt , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , K T Donovan , J D Dowell , A Droutskoi , C Duprel , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , S Ferron , M Fleischer , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hilgers , K H Hiller , C D Hilton , J Hladky , P Hoting , D Hoffmann , P Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , L Jonsson , D P Johnson , M Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , O Kaufmann , M Kausch , F Keil , N Keller , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , M W Krasny , H Krehbiel , J Kroseberg , D Krucker , K Kruger , A Kupper , T Kuhr , T Kurca , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , A Lebedev , F Lehner , V Lemaitre , R Lemrani , V Lendermann , S Levonian , M Lindstroem , G Lobo , E Lobodzinska , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , D Ozerov , V Panassik , C Pascaud , S Passaggio , G D Patel , E Perez , J P Phillips , D Pitzl , R Poschl , I Potashnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , T Schorner , V Schroder , H C Schultz-Coulon , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , P Sievers , Y Sirois , T Sloan , P Smirnow , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , D Traynor , P Truol , G Tsipolitis , J Turnau , J Turney , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , A Van Haecke , P Van Mechelen , Y Vazdik , G Villet , S von Dombrowski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zur Nedden (1999) Forward pi degrees-meson production at HERA PHYSICS LETTERS B 462: 3-4. 440-452 SEP 16 Abstract: High transverse momentum pi(o)-mesons have been measured with the H1 detector at HERA in deep-inelastic ep scattering events at low Bjorken-x, down to x approximate to 4 . 10(-5). The measurement is performed in a region of small angles with respect to the proton remnant in the laboratory frame of reference, namely the forward region. and corresponds to central rapidity in the centre of mass system of the virtual photon and proton. This region is expected to be particularly sensitive to QCD effects in hadronic final states. Differential cross-sections for inclusive pi(o)-meson production are presented as a function of Bjorken-x and the four-momentum transfer squared, Q(2), and as a function of transverse momentum and pseudorapidity. A recent numerical BFKL calculation and predictions from QCD models based on DGLAP parton evolution are compared with the data. (C) 1999 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , S Burke , A Burrage , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , R Demirchyan , C Diaconu , M Dirkmann , P Dixon , V Dodonov , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , S Ferron , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , K Hewitt , M Hilgers , K H Hiller , C D Hilton , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , L Jonsson , D P Johnson , M Jones , H Jung , H K Kastli , M Kander , D Kant , M Kapichine , M Karlsson , O Karschnick , O Kaufmann , M Kausch , F Keil , N Keller , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , K Kruger , A Kupper , H Kuster , M Kuhlen , T Kurca , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , R Lemrani , V Lendermann , S Levonian , M Lindstroem , G Lobo , E Lobodzinska , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , V Panassik , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , I Potashnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , T Schorner , V Schroder , H C Schultz-Coulon , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , F Squinabol , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , R Todenhagen , D Traynor , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , A Van Haecke , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zur Nedden (1999) A search for leptoquark bosons and lepton flavor violation in e(+)p collisions at HERA EUROPEAN PHYSICAL JOURNAL C 11: 3. 447-471 DEC Abstract: A search for new bosons possessing couplings to lepton-quark pairs is performed in the H1 experiment at HERA using 1994 to 1997 data corresponding to an integrated luminosity of 37 pb(-1). First generation leptoquarks (LQs) are searched in very high Q(2) neutral (NC) and charged (CC) current data samples. The measurements are compared to Standard Model (SM) expectations from deep-inelastic scattering (DIS). A deviation in the Q(2) spectrum previously observed in the 1994 to 1996 dataset at Q(2)greater than or similar to 15000 GeV2 remains, though with less significance. This deviation corresponded to a clustering in the invariant mass spectrum at M similar or equal to 200 GeV which is not observed with the 1997 dataset alone. The NC DIS data is used to constrain the Yukawa couplings lambda of first generation scalar and vector LQs in the Buchmuller-Ruckl-Wyler effective model. Scalar LQs are excluded for masses up to 275 GeV for a coupling of electromagnetic strength, lambda = 0.3. A sensitivity to coupling values less than or similar to 1 is established for masses up to 400 GeV for any LQ type. The NC and CC DIS data are combined to constrain lambda for arbitrary branching ratios of the LQ into eq in a generic model. For a decay branching ratio into e(+)u pairs as small as 10%, LQ masses up to 260 GeV are ruled out for lambda = 0.3. LQs possessing couplings to mixed fermion generations, which could lead to signals of lepton flavor violation (LFV), are searched in events with a high transverse momentum mu or tau. No mu + X or tau + X event candidate is found that is compatible with LQ kinematics. Constraints are set on the Yukawa coupling involving the mu and tau lepton in a yet unexplored mass range.
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C Adloff , V Andreev , B Andrieu , A Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , C Beier , A Belousov , T Benisch , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , W Braunschweig , V Brisson , H B Broker , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Bunyatyan , S Burke , A Burrage , G Buschhorn , D Calvet , A J Campbell , J Cao , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , C Collard , J G Contreras , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , B Delcourt , R Demirchyan , A De Roeck , E A De Wolf , C Diaconu , P Dixon , V Dodonov , K T Donovan , J D Dowell , A Droutskoi , C Duprel , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , S Ferron , M Fleischer , G Flugge , A Fomenko , I Foresti , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , G Herrera , I Herynek , M Hilgers , K H Hiller , C D Hilton , J Hladky , P Hoting , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , M Jacquet , M Jaffre , L Janauschek , D M Jansen , X Janssen , L Jonsson , D P Johnson , A Zhokin , M Jones , H Jung , H K Kastli , D Kant , M Kapichine , M Karlsson , O Karschnick , O Kaufmann , M Kausch , F Keil , N Keller , I R Kenyon , S Kermiche , C Kiesling , M Klein , C Kleinwort , G Knies , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , M V Krasny , H Krehbiel , J Kroseberg , D Krucker , K Kruger , A Kupper , T Kuhr , T Kurca , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , R Lemrani , V Lendermann , S Levonian , M Lindstroem , V Lubimov , G Lobo , E Lobodzinska , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , O Nix , G Nowak , T Nunnemann , J E Olsson , A Usik , D Ozerov , P Palmen , V Panassik , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Perez , J P Phillips , D Pitzl , R Poschl , I Potashnikova , B Povh , K Rabbertz , G Radel , J Rauschenberger , P Reimer , B Reisert , D Reyna , S Riess , E Rizvi , P Robmann , R Roosen , A Rostovtsev , C Royon , S Rusakov , K Rybicki , D P C Sankey , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , T Schorner , V Schroder , H C Schultz-Coulon , F Sefkow , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , R Stamen , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , M Tasevsky , V Tchernyshov , S Tchetchelnitski , G Thompson , P D Thompson , N Tobien , R Todenhagen , D Traynor , P Truol , G Tsipolitis , J Turnau , J Turney , E Tzamariudaki , S Udluft , S Valkar , A Valkarova , C Vallee , A Van Haecke , P Van Mechelen , Y Vazdik , G Villet , S von Dombrowski , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , G White , S Wiesand , T Wilksen , M Winde , G G Winter , C Wissing , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , P Zini , F Zomer , J Zsembery , M zur Nedden (1999) Measurement of open beauty production at HERA PHYSICS LETTERS B 467: 1-2. 156-164 NOV 11 Abstract: The first observation of open b production in ep collisions is reported. An event sample containing muons and jets has been selected which is enriched in semileptonic b quark decays. The visible cross section sigma(ep --> b (b) over bar X --> mu X') for Q(2) < 1 GeV2, 0.1 < y < 0.8 is measured to be 0.176 +/- 0.016(stat.)(+0.026)(-0.017)(syst.) nb for the muons to be detected in the range 35 degrees < theta(mu) < 130 degrees and p(perpendicular to)(mu) > 2.0GeV in the laboratory frame. The expected visible cross section based on a NLO QCD calculation is 0.104 +/- 0.017nb. The cross sections for electroproduction with Q(2) < 1GeV(2) and photoproduction are derived from the data and found to be sigma(ep --> eb (b) over bar X) = 7.1 +/- 0.6(stat.)(-1.3)(+1.5)(syst.)nb and sigma(gamma p --> b (b) over bar X) = 111+/- 10(stat.)(-20)(+23) (syst.) nb at an average [W-gamma p] similar to 180GeV, respectively. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , V Andreev , B Andrieu , V Arkadov , A Astvatsatourov , I Ayyaz , A Babaev , J Bahr , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , T Berndt , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Buniatian , S Burke , A Burrage , G Buschhorn , D Calvet , A J Campbell , T Carli , C Chabert , M Charlet , D Clarke , B Clerbaux , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , S D Dau , E Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , R Demirchyan , C Diaconu , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , P J W Faulkner , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gassner , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , D Hoffmann , R Horisberger , S Hurling , M Ibbotson , C Issever , M Jacquet , M Jaffre , L Janauschek , D M Jansen , L Jonsson , D P Johnson , M Jones , H Jung , H K Kastli , M Kander , D Kant , M Kapichine , M Karlsson , O Karschnik , J Katzy , O Kaufmann , M Kausch , N Keller , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , K Kruger , A Kupper , H Kuster , M Kuhlen , T Kurca , W Lachnit , R Lahmann , D Lamb , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , R Lemrani , V Lendermann , S Levonian , M Lindstroem , G Lobo , E Lobodzinska , V Lubimov , S Luders , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , N Malden , E Malinovski , I Malinovski , R Maracek , P Marage , J Marks , R Marshall , H U Martyn , J Martyniak , S J Maxfield , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , R Mohr , S Mohrdieck , M N Mondragon , F Moreau , A Morozov , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , J Naumann , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , V Panassik , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , J Rauschenberger , P Reimer , B Reisert , D Reyna , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , F P Schilling , S Schleif , P Schleper , D Schmidt , L Schoeffel , V Schroder , H C Schultz-Coulon , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , H Spitzer , F Squinabol , R Stamen , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , D Traynor , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , A Van Haecke , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , G White , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wissing , C Wittek , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zur Nedden (1999) Charmonium production in deep inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 10: 3. 373-393 OCT Abstract: The electroproduction of J/psi and psi(2S) mesons is studied in elastic, quasi-elastic and inclusive reactions for four momentum transfers 2 < Q(2) < 80 GeV2 and photon-proton centre of mass energies 25 < W < 180 GeV. The data were taken with the H1 detector at the electron proton collider HERA in rile years 1995 to 1997. The total virtual photon-proton cross section for elastic J/psi production is measured as a function of Q(2) and W. The dependence of the production rates on the square of the momentum transfer from the proton (t) is extracted. Decay angular distributions are analysed and the ratio of the longitudinal and transverse cross sections is derived. The ratio of the cross sections for quasi-elastic psi(2S) and J/psi meson production is measured as a function of Q(2). Tilt results are discussed in terms of theoretical models based upon perturbative QCD. Differential cross sections for inclusive and inelastic production of J/psi mesons are determined and predictions within two theoretical frameworks are compared with the data, the non-relativistic QCD factorization approach including colour octet and colour singlet contributions, and the model of Soft Colour Interactions.
Notes:
C Adloff , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , W Bartel , U Bassler , P Bate , M Beck , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , R Demirchyan , C Diaconu , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , D Hoffmann , T Holtom , W Hoprich , R Horisberger , V L Hudgson , S Hurling , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , D M Jansen , L Jonsson , D P Johnson , H Jung , H K Kastli , M Kander , D Kant , M Kapichine , M Karlsson , O Karschnik , J Katzy , O Kaufmann , M Kausch , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , K Kruger , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , V Lendermann , S Levonian , M Lindstroem , B List , G Lobo , E Lobodzinska , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , G Martin , H U Martyn , J Martyniak , S J Maxfield , S J McMahon , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , S Mikocki , D Milstead , J Moeck , R Mohr , S Mohrdieck , F Moreau , J V Morris , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , T Naumann , I Negri , P R Newman , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , D Nikitin , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , V Panassik , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , J Rauschenberger , P Reimer , B Reisert , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schleif , P Schleper , D Schmidt , L Schoeffel , V Schroder , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , Y Sirois , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , V Spaskov , A Specka , J Spiekermann , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , A Van Haecke , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zur Nedden (1999) Charged particle cross sections in photoproduction and extraction of the gluon density in the photon EUROPEAN PHYSICAL JOURNAL C 10: 3. 363-372 OCT Abstract: Photoproduction data collected with the H1 detector at HERA in 1994 are used to study the cross-sections for inclusive charged particle production and the structure of the photon. The differential cross-sections d sigma/dp(T)(2), for /eta/ < 1 in the HERA laboratory frame, and d sigma/d eta for p(T) > 2 GeV/c and p(T) > 3 GeV/c have been measured. Model calculations of these cross-sections, based on perturbative QCD, indicate that the results are sensitive to the parton densities of the photon as well as to higher order effects, which are phenomenologically treated by multiple interactions. This sensitivity is exploited tc, determine the leading order x(gamma) distribution of partons in the photon using a new method based on high p(T) charged particles. The gluon content of the photon is extracted and found to rise with decreasing x(gamma).
Notes:
1998
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , M Beck , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , R Beyer , P Biddulph , J C Bizot , K Borras , F Botterweck , V Boudry , S Bourov , A Braemer , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , C Brune , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L DAvis , A De Roeck , E A De Wolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , B Gonzalez-Pineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , I Herynek , M F Hess , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , J Janoth , D M Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , J Lipinski , B List , G Lobo , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schiek , S Schleif , P Schleper , W von Schlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , K Stolze , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , J Zalesak , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , P Van Mechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1998) Thrust jet analysis of deep-inelastic large-rapidity-gap events EUROPEAN PHYSICAL JOURNAL C 1: 3-4. 495-507 FEB Abstract: A thrust analysis of Large-Rapidity-Gap events in deep-inelastic cp collisions is presented, using data taken with the H1 detector at HERA in 1994. The average thrust of the final states X, which emerge from the dissociation of virtual photons in the range 10 < Q(2) < 100 GeV2 grows with hadronic mass nr, and implies a dominant 2-jet topology. Thrust is found to decrease with growing P-t, the thrust jet momentum transverse to the photon-proton collision axis. Distributions of P-t(2) are consistent with being independent of M-x. They show a strong alignment of the thrust axis with the photon-proton collision axis. and have a large high-P-t tail. The correlation of thrust with M-x is similar to that ill e(+)e(-) annihilation at root s(ee) = M-x but with lower values of thrust in the ep data. The data cannot be described by interpreting the dissociated system X as a q (q) over bar state but inclusion of a substantial fraction of q (q) over bar q parton configurations leads naturally to the observed properties. The soft colour exchange interaction model does not describe the data.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , M Beck , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , R Beyer , P Biddulph , J C Bizot , K Borras , F Botterweck , V Boudry , S Bourov , A Braemer , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , C Brune , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , A De Roeck , E A De Wolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , B Gonzalez-Pineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , I Herynek , M F Hess , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , J Janoth , D M Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , J Lipinski , B List , G Lobo , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schiek , S Schleif , P Schleper , W von Schlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , K Stolze , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , P Van Mechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1998) Measurement of the inclusive di-jet cross section in photoproduction and determination of an effective parton distribution in the photon EUROPEAN PHYSICAL JOURNAL C 1: 1-2. 97-107 JAN Abstract: The double-differential inclusive di-jet cross section in photoproduction processes is measured with the H1 detector at HERA. The cross section is determined as a function of the average transverse jet energy E-T(jets) for ranges of the fractional energy x(gamma)(jets) of the parton from the photon side. An effective leading order parton distribution in the photon is determined at large parton fractional energies for scales between 80 < p(T)(2) < 1250 GeV2. The measurement is compatible with the logarithmic scale dependence that is predicted by perturbative QCD.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , M Beck , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , R Beyer , P Biddulph , J C Bizot , K Borras , V Boudry , S Bourov , A Braemer , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , C Brune , J Bruger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , A De Roeck , E A De Wolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , B Gonzalez-Pineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holton , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , J Janoth , D M Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , J Lipinski , B List , G Lobo , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schiek , S Schleif , W von Schlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , K Stolze , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , P Van Mechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M ZurNedden (1998) Photo-production of psi(2S) mesons at HERA PHYSICS LETTERS B 421: 1-4. 385-394 MAR 5 Abstract: Quasi-elastic (z > 0.95) photo-production of psi(2S) mesons has been observed at HERA for photon-proton centre-of-mass energies in the range 40 to 160 GeV. The psi(2S) mesons were identified through their decays to l(+)l(-), and to J/psi pi(+)pi(-), where the J/psi subsequently decays to l(+)l(-), the lepton l being either a muon or an electron. The cross-section for quasi-elastic photoproduction was measured to be (18.0 +/- 2.8(stat) +/- 3.0(syst)) nb at a photon-proton centre-of-mass energy of 80 GeV. The ratio of the psi(2S) to J/psi quasi-elastic cross-sections is (0.150 +/- 0.027(stat) +/- 0.022(syst)). (C) 1998 Elsevier Science B.V.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , P Bate , M Beck , A Beglarian , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , R Beyer , P Biddulph , J C Bizot , K Borras , V Boudry , A Braemer , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , C Brune , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , B E Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , A De Roeck , E A De Wolf , B Delcourt , C Diaconu , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E ELsen , M Enzenberger , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holton , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , J Janoth , D M Jansen , L Jonsson , D P Johnson , H Jung , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , K H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , M Lehmann , F Lehner , V Lemaitre , S Levonian , M Lindstroem , J Lipinski , B List , G Lobo , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , G Martin , R Martin , H U Martyn , J Martyniak , S J Maxfield , S J McMahon , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , R Mohr , S Mohrdieck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , P Reimer , B Reisert , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schiek , S Schleif , P Schleper , W von Schlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , K Stolze , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M ZurNedden (1998) Hadron production in diffractive deep-inelastic scattering PHYSICS LETTERS B 428: 1-2. 206-220 MAY 28 Abstract: Characteristics of hadron production in diffractive deep-inelastic positron-proton scattering are studied using data collected in 1994 by the Hi experiment at HERA. The following distributions are measured in the centre-of-mass frame of the photon dissociation system: the hadronic energy flow, the Feynman-x (x(F),) variable for charged particles, the squared transverse momentum of charged particles (p(T)*(2)), and the mean p(T)*(2) as a function of x(F),. These distributions are compared with results in the gamma *p centre-of-mass frame from inclusive deep-inelastic scattering in the fixed-target experiment EMC, and also with the predictions of several Monte Carlo calculations. The data are consistent with a picture in which the partonic structure of the diffractive exchange is dominated at low Q(2) by hard gluons. (C) 1998 Elsevier Science B.V. All rights reserved.
Notes:
C Adloff , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , R Barschke , W Bartell , U Bassler , P Bate , M Beck , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , P Biddulph , J C Bizot , V Boudry , A Braemer , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , M Davidsson , A De Roeck , E A De Wolf , B Delcourt , C Diaconu , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , S Hurling , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , D M Jansen , L Jonsson , D P Johnson , H Jung , H C Kaestli , M Kander , D Kant , M Karlsson , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , B List , G Lobo , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , G Martin , H U Martyn , J Martyniak , S J Maxfield , S J McMahon , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , R Mohr , S Mohrdieck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , P Reimer , B Reisert , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schiek , S Schleif , P Schleper , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1998) Observation of events with an isolated high energy lepton and missing transverse momentum at HERA EUROPEAN PHYSICAL JOURNAL C 5: 4. 575-584 OCT Abstract: A search for events with an imbalance in transverse momentum and with isolated high energy leptons has been carried out at the positron-proton collider HERA. One e(v)ent with and e(-) and five events with a mu(+/-) are found together with evidence for undetected particles carrying transverse momentum. Within the Standard Model the dominant origin of events with this kind of topology is the production of W bosons with subsequent leptonic decay. Three of the six events are within measurement errors found in a region of phase space likely to be populated by this process, while the remaining events show kinematic properties which are atypical of all Standard Model processes considered.
Notes:
C Adloff , M Anderson , V Andreev , B Andrieu , V Arkadov , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , P Bate , M Beck , A Beglarian , O Behnke , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , P Biddulph , J C Bizot , K Borras , V Boudry , A Braemer , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , A De Roeck , E A De Wolf , B Delcourt , C Diaconu , M Dirkmann , P Dizon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , S Hurling , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , D M Jansen , L Jonsson , D P Johnson , H Jung , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , M Lehmann , F Lehner , V Lemaitre , S Levonian , M Lindstroem , B List , G Lobo , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , G Martin , R Martin , H U Martyn , J Martyniak , S J Maxfield , S J McMahon , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , R Mohr , S Mohrdieck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagovizin , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , P Reimer , B Reisert , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schiek , S Schleif , P Schleper , D Schmidt , G Schmidt , L Schoeffel , V Schroder , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1998) Differential (2+1) jet event rates and determination of alpha(s) in deep inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 5: 4. 625-639 OCT Abstract: Events with a (2+1) jet topology in deep-inelastic scattering at HERA are studied in the kinematic range 200 < Q(2) < 10000 GeV2. The rate of (2+1) jet events has been determined with the modified JADE jet algorithm as a function of the jet resolution parameter and is compared with the predictions of Monte Carlo models. In addition, the event rate is corrected for both hadronization and detector effects and is compared with next-to-leading order QCD calculations. A value of the strong coupling constant of alpha(s)(M-Z(2)) = 0.118 +/- 0.002 (stat.) (+0.007)(-0.008) (syst.) (+0.007)(-0.006) (theory) is extracted. the systematic error includes uncertainties in the calorimeter energy calibration, in the description of the data by current Monte Carlo models, and in the knowledge of the parton densities. The theoretical error is dominated by the renormalization scale ambiguity.
Notes:
C Adloff , M Anderson , V Andreev , B Andrieu , V Arkadov , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , P Bate , M Beck , A Beglarian , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , P Biddulph , J C Bizot , K Borras , V Boudry , A Braemer , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , E Chabert , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , J Cvach , J B Dainton , W D Dau , K Daum , M David , A De Roeck , E A De Wolf , B Delcourt , C Diaconu , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , G Eckerlin , D Eckstein , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Enzenberger , N Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , S Ghazaryan , A Glazov , L Goerlich , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , V Haustein , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , R Heremans , I Herynek , K Hewitt , K H Hiller , C D Hilton , J Hladky , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , D M Jansen , L Jonsson , D P Johnson , H Jung , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P Landon , W Lange , U Langenegger , A Lebedev , M Lehmann , F Lehner , V Lemaitre , S Levonian , M Lindstroem , B List , G Lobo , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , G Martin , R Martin , H U Martyn , J Martyniak , S J Maxfield , S J McMahon , T R McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , R Mohr , S Mohrdieck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagavizin , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , O Nix , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , P Reimer , B Reisert , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schiek , S Schleif , P Schleper , D Schmidt , G Schmidt , L Schoeffel , V Schroder , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , S Udluft , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , P Van Mechelen , Y Vazdik , G Villet , K Wacker , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wittmann , M Wobisch , H Wollatz , E Wunsch , J Zacek , J Zalesak , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1998) Multiplicity structure of the hadronic final state in diffractive deep-inelastic scattering at HERA EUROPEAN PHYSICAL JOURNAL C 5: 3. 439-452 SEP Abstract: The multiplicity structure of the hadronic system X produced in deep-inelastic processes at HERA of the type ep --> eXY, where Y is a hadronic system with mass M-Y < 1.6 GeV and where the squared momentum transfer at the pY vertex, t, is limited to \t\ < 1 GeV2, is studied as a function of the invariant mass M-X of the system X. Results are presented on multiplicity distributions and multiplicity moments, rapidity spectra and forward-backward correlations in the centre-of-mass system of X. The data are compared to results in e+e- annihilation, fixed-target lepton-nucleon collisions, hadro-produced diffractive final states and to non-diffractive hadron-hadron collisions. The comparison suggests a production mechanism of virtual photon dissociation which involves a mixture of partonic states and a significant gluon content. The data are well described by a model, based on a QCD-Regge analysis of the diffractive structure function, which assumes a large hard gluonic component of the colourless exchange at low Q2. A model with soft colour interactions is also successful.
Notes:
1997
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , C Arndt , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , M Beck , H P Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , W Bruckner , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Kirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , K T Donovan , J D Dowell , H B Dreis , A Droutskoi , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , W Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , H Genzel , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffith , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , W Hildesheim , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , D M Jansen , T Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , S Levonian , G Lindstrom , M Lindstroem , F Linsel , J Lipinski , B List , G Lobo , P Loch , J W Lomas , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , F Metlica , A Meyer , H Mayer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , G W Noyes , T Nunnemann , M NybergWerther , M Oakden , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , B Povh , S Prell , K Rabbertz , G Radel , P Reimer , S Reinshagen , H Rick , F Riepenhausen , S Riess , E Rizvi , P Robmann , H E Roloff , R Roosen , K Rostenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , H Steiner , J Steinhart , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , J Tutas , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , K Zuber , M zurNedden (1997) Search for excited fermions with the H1 detector NUCLEAR PHYSICS B 483: 1-2. 44-64 JAN 6 Abstract: We present a search for excited electrons, neutrinos and quarks using the H1 detector at the ep collider HERA, based on data taken in 1994 with an integrated luminosity of 2.75 pb(-1). Radiative decays of excited quarks and neutrinos have been investigated as well as decays of excited electrons into all possible electroweak gauge bosons. No evidence for new particle production is found and exclusion limits are derived.
Notes:
I Abt , T Ahmed , S Aid , V Andreev , B Andrieu , R D Appuhn , C Arnault , M Arpagaus , A Babaev , H Barwolff , J Ban , E Banas , P Baranov , E Barrelet , W Bartel , M Barth , U Bassler , F Basti , D E Baynham , J M Baze , G A Beck , H P Beck , D Bederede , H J Behrend , C Beigbeder , A Belousov , C Berger , H Bergstein , R Bernard , G Bernardi , R Bernet , R Bernier , U Berthon , G BertrandCoremans , M Besancon , R Beyer , J C Biasci , P Biddulph , V Bidoli , E Binder , P Binko , J C Bizot , V Blobel , F Blouzon , H Blume , K Borras , V Boudry , C Bourdarios , F Brasse , W Braunschweig , D Breton , H Brettel , V Brisson , D Bruncko , C Brune , U Buchner , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , P Burmeister , A Busata , G Buschhorn , A J Campbell , T Carli , F Charles , M Charlet , R Chase , D Clarke , A B Clegg , M Colombo , V Commichau , J F Connolly , U Cornett , J A Coughlan , A Courau , M C Cousinou , C Coutures , A Coville , G Cozzika , D A Cragg , L Criegee , H I Cronstrom , N H Cunliffe , J Cvach , A Cyz , S Dagoret , J B Dainton , M Danilov , A W E Dann , D Darvill , W D Dau , J David , M David , R J Day , E Deffur , B Delcourt , L DelBuono , F Descamps , M Devel , J P Dewulf , A DeRoeck , P Dingus , K Djidi , C Dollfus , J D Dowell , H B Dreis , A Drescher , U Dretzler , J Duboc , A Ducorps , D Dullmann , O Dunger , H Duhm , B Dulny , F Dupont , R Ebbinghaus , M Eberle , J Ebert , T R Ebert , G Eckerlin , B W H Edwards , V Efremenko , S Egli , S Eichenberger , R Eichler , F Eisele , E Eisenhandler , N N Ellis , R J Ellison , E Elsen , A Epifantsev , M Erdmann , W Erdmann , G Ernst , E Evrard , G Falley , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , Z Y Feng , I F Fensome , J Fent , J Ferencei , F Ferrarotto , K Finke , K Flamm , W Flauger , M Fleischer , M Flieser , P S Flower , G Flugge , A Fomenko , B Fominykh , M Forbush , J Formanek , J L Foster , G Franke , E Fretwurst , W Frochtenicht , P Fuhrmann , E Gabathuler , K Gabathuler , K Gadow , K Gamerdinger , J Garvey , J Gayler , E Gazo , A Gellrich , M Gennis , U Gensch , H Genzel , R Gerhards , K Geske , I Giesgen , D Gillespie , W Glasgow , L Godfrey , J Godlewski , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , A M Goodall , I Gorelov , P Goritchev , L Gosset , C Grab , H Grassler , R Grassler , T Greenshaw , C Gregory , H Greif , M Grewe , G Grindhammer , A Gruber , C Gruber , S Gunther , J Haack , M Haguenauer , D Haidt , L Hajduk , D Hammer , O Hamon , M Hampel , D Handschuh , K Hangarter , E M Hanlon , M Hapke , U Harder , J Harjes , P Hartz , P E Hatton , R Haydar , W J Haynes , J Heatherington , V Hedberg , C R Hedgecock , G Heinzelmann , R C W Henderson , H Henschel , R Herma , I Herynek , W Hildesheim , P Hill , D L Hill , C D Hilton , J Hladky , K C Hoeger , R B Hopes , R Horisberger , A Hrisoho , J Huber , P Huet , H Hufnagel , N Huot , J F Huppert , M Ibbotson , D Imbault , H Itterbeck , M A Jabiol , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , P Jean , J Jeanjean , L Jonsson , K Johannsen , D P Johnson , L Johnson , P Jovanovic , H Jung , P I P Kalmus , D Kant , G Kantel , S Karstensen , S Kasarian , R Kaschowitz , P Kasselmann , U Kathage , H H Kaufmann , G Kemmerling , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , W Ko , T Kobler , J Koch , T Kohler , J Kohne , M Kolander , H Kolanoski , F Kole , J Koll , S D Kolya , B Koppitz , V Korbel , M Korn , P Kostka , S K Kotelnikov , M W Krasny , H Krehbiel , F Krivan , D Krucker , U Kruger , U KrunerMarquis , M Kubantsev , J P Kubenka , T Kulper , H J Kusel , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , B Kuznik , B Laforge , F Lamarche , R Lander , M P J Landon , W Lange , R Langkau , P Lanius , J F Laporte , L Laptin , H Laskus , A Lebedev , M Lemler , U Lenhardt , A Leuschner , C Leverenz , S Levonian , D Lewin , C Ley , A Lindner , G Lindstrom , F Linsel , J Lipinski , B Liss , P Loch , A B Lodge , H Lohmander , G C Lopez , J P Lottin , V Lubimov , K Ludwig , D Luers , N Lugetski , B Lundberg , K Maeshima , N Magnussen , E Malinovski , S Mani , P Marage , J Marks , R Marshall , J Martens , F Martin , G Martin , R Martin , H U Martyn , J Martyniak , V Masbender , S Masson , A Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , J Meissner , D Mercer , T Merz , C A Meyer , H Meyer , J Meyer , S Mikocki , J L Mills , V Milone , J Mock , E Monnier , B Montes , F Moreau , J Moreels , B Morgan , J V Morris , J M Morton , K Muller , P Murin , S A Murray , V Nagovizin , B Naroska , T Naumann , P Nayman , A Nepeipivo , P Newman , D NewmanCoburn , D Newton , D Neyret , H K Nguyen , F Niebergall , C Niebuhr , R Nisius , T Novak , H Novakova , G Nowak , G W Noyes , M Nyberg , H Oberlack , U Obrock , J E Olsson , J Olszowska , S Orenstein , F OuldSaada , P Pailler , S Palanque , S Panaro , A Panitch , J Y Parey , C Pascaud , G D Patel , A Patoux , C Paulot , U Pein , E Peppel , E Perez , P Perrodo , A Perus , S Peters , J P Pharabod , H T Phillips , J P Phillips , C Pichler , A Pieuchot , W Pimpl , D Pitzl , A Porrovecchio , S Prell , R Prosi , H Quehl , G Radel , F Raupach , K Rauschnabel , A Reboux , P Reimer , G Reinmuth , S Reinshagen , P Ribarics , V Riech , J Riedlberger , H Riege , S Riess , M Rietz , S M Robertson , P Robmann , P Ropnack , R Roosen , K Rosenbauer , A Rostovtsev , C Royon , A Rudge , K Ruter , M Rudowicz , M Ruffer , S Rusakov , V Rusinov , K Rybicki , J Sacton , N Sahlmann , E Sanchez , D P C Sankey , M Savitski , P Schacht , S Schiek , N Schirm , S Schleif , P Schleper , W vonSchlippe , C Schmidt , D Schmidt , G Schmidt , W Schmitz , H Schmucker , V Schroder , J Schutt , E Schuhmann , M Schulz , A Schwind , W Scobel , U Seehausen , F Sefkow , R Sell , M Seman , A Semenov , P Shatalov , V Shekelyan , I Sheviakov , H Shooshtari , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , A Sirous , I O Skillicorn , P Skvaril , P Smirnov , J R Smith , L Smolik , D Sole , Y Soloviev , J Spalek , H Spitzer , R vonStaa , J Staeck , P Staroba , J Stastny , M Steenbock , P Stefan , P Steffen , R Steinberg , H Steiner , B Stella , K Stephens , J Stier , J Stiewe , U Stosslein , J Strachota , U Straumann , A Strowbridge , W Struczinski , J P Sutton , Z Szkutnik , G Tappern , S Tapprogge , R E Taylor , V Tchernyshov , V Tchudakov , C Thiebaux , K Thiele , G Thompson , R J Thompson , I Tichomirov , C Trenkel , W Tribanek , K Troger , P Truol , M Turiot , J Turnau , J Tutas , L Urban , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , G VanBeek , M Vanderkelen , L VanLancker , P VanMechelen , A Vartapetian , Y Vazdik , M Vecko , P Verrecchia , R Vick , G Villet , E Vogel , A Wacker , M Wagener , I W Walker , A Walther , G Weber , D Wegener , A Wegner , P Weissbach , H P Wellisch , L West , D White , S Willard , M Winde , G G Winter , T Wolff , L A Womersley , A E Wright , E Wunsch , N Wulff , B E Wyborn , T P Yiou , J Zacek , D Zarbock , P Zavada , C Zeitnitz , Z Zhang , H Ziaeepour , M Zimmmer , W Zimmermann , F Zomer , K Zuber (1997) The tracking, calorimeter and muon detectors of the H1 experiment at HERA NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 386: 2-3. 348-396 FEB 21 Abstract: Technical aspects of the three major components of the H1 detector at the electron-proton storage ring HERA are described. This paper covers the detector status up to the end of 1994 when a major upgrading of some of its elements was undertaken. A description of the other elements of the detector and some performance figures from luminosity runs at HERA during 1993 and 1994 are given in a paper previously published in this journal.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , H P Beck , M Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , R Beyer , P Biddulph , P Bispham , J C Bizot , K Borras , F Botterweck , V Boudry , S Bourov , A Braemer , W Braunschweig , V Brisson , W Bruckner , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , B D Cox , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , A DeRoeck , E A DeWolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , C Dollfus , K T Donovan , J D Dowell , H B Dreis , A Droutskoi , O Dunger , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , H Genzel , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , A Jacholkowska , C Jacobsson , M Jacquet , M Jaffre , J Janoth , D M Jansen , T Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krebbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , B Laforge , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , G Lindstrom , M Lindstroem , F Linsel , J Lipinski , B List , G Lobo , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , H MahlkeKruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , M NybergWerther , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , S Prell , K Rabbertz , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P VanEsch , P VanMechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , R Wallny , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , K Zuber , M zurNedden (1997) Observation of events at very high Q(2) in ep collisions at HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 74: 2. 191-205 APR Abstract: Measurements of ep scattering with squared 4-momentum transfer Q(2) up to 35000 GeV2 are compared with the expectation of the standard deep-inelastic model of lepton-nucleon scattering (DIS). For Q(2) > 15000 GeV2 N-obs = 12 neutral current candidate events are observed where the expectation is N-DIS = 4.71 +/- 0.76 events. In the same Q(2) range, N-obs = 4 charged current candidates are observed where the expectation is N-DIS = 1.77 +/- 0.87 events. The probability P(N greater than or equal to N-obs) that the DIS model signal N fluctuates to N greater than or equal to N-obs in a random set of experiments is 6 x 10(-3) for neutral current and 0.14, for charged cur rent, The difference in the observed and expected number of Neutral Current events is mostly due to events at large masses M = root xs in which the positron is backscattered at large y = Q(2)/M-2.
Notes:
I Abt , T Ahmed , S Aid , V Andreev , B Andrieu , R D Appuhn , C Arnault , M Arpagaus , A Babaev , H Barwolff , J Ban , E Banas , P Baranov , E Barrelet , W Bartel , M Barth , U Bassler , F Basti , D E Baynham , J M Baze , G A Beck , H P Beck , D Bederede , H J Behrend , C Beigbeder , A Belousov , C Berger , H Bergstein , R Bernard , G Bernardi , R Bernet , R Bernier , U Berthon , G BertrandCoremans , M Besanson , R Beyer , J C Biasci , P Biddulph , V Bidoli , E Binder , P Binko , J C Bizot , V Blobel , F Blouzon , H Blume , K Borras , V Boudry , C Bourdarios , F Brasse , W Braunschweig , D Breton , H Brettel , V Brisson , D Bruncko , C Brune , U Buchner , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , P Burmeister , A Busata , G Buschhorn , A J Campbell , T Carli , F Charles , M Charlet , R Chase , D Clarke , A B Clegg , M Colombo , V Commichau , J F Connolly , U Cornett , J A Coughlan , A Courau , M C Cousinou , C Coutures , A Coville , G Cozzika , D A Cragg , L Criegee , H I Cronstrom , N H Cunliffe , J Cvach , A Cyz , S Dagoret , J B Dainton , M Danilov , A W E Dann , D Darvill , W D Dau , J David , M David , R J Day , E Deffur , B Delcourt , L DelBuono , F Descamps , M Devel , J P Dewulf , A DeRoeck , P Dingus , K Djidi , C Dollfus , J D Dowell , H B Dreis , A Drescher , U Dretzler , J Duboc , A Ducorps , D Dullmann , O Dunger , H Duhm , B Dulny , F Dupont , R Ebbinghaus , M Eberle , J Ebert , T R Ebert , G Eckerlin , B W H Edwards , V Efremenko , S Egli , S Eichenberger , R Eichler , F Eisele , E Eisenhandler , N N Ellis , R J Ellison , E Elsen , A Epifantsev , M Erdmann , W Erdmann , G Ernst , E Evrard , G Falley , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , Z Y Feng , I F Fensome , J Fent , J Ferencei , F Ferrarotto , K Finke , K Flamm , W Flauger , M Fleischer , M Flieser , P S Flower , G Flugge , A Fomenko , B Fominykh , M Forbush , J Formanek , J M Foster , G Franke , E Fretwurst , W Frochtenicht , P Fuhrmann , E Gabathuler , K Gabathuler , K Gadow , K Gamerdinger , J Garvey , J Gayler , E Gazo , A Gellrich , M Gennis , U Gensch , H Genzel , R Gerhards , K Geske , I Giesgen , D Gillespie , W Glasgow , L Godfrey , J Godlewski , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , A M Goodall , I Gorelov , P Goritchev , L Gosset , C Grab , H Grassler , R Grassler , T Greenshaw , C Gregory , H Greif , M Grewe , G Grindhammer , A Gruber , C Gruber , S Gunther , J Haack , M Haguenauer , D Haidt , L Hajduk , D Hammer , O Hamon , M Hampel , D Handschuh , K Hangarter , E M Hanlon , M Hapke , U Harder , J Harjes , P Hartz , P E Hatton , R Haydar , W J Haynes , J Heatherington , V Hedberg , C R Hedgecock , G Heinzelmann , R C W Henderson , H Henschel , R Herma , I Herynek , W Hildesheim , P Hill , D L Hill , C D Hilton , J Hladky , K C Hoeger , R B Hopes , R Horisberger , A Hrisoho , J Huber , P Huet , H Hufnagel , N Huot , J F Huppert , M Ibbotson , D Imbault , H Itterbeck , M A Jabiol , A Jacholkowska , C Jacobsson , M Jaffre , T Jansen , P Jean , J Jeanjean , L Jonsson , K Johannsen , D P Johnson , L Johnson , P Jovanovic , H Jung , P I P Kalmus , D Kant , G Kantel , S Karstensen , S Kasarian , R Kaschowitz , P Kasselmann , U Kathage , H H Kaufmann , G Kemmerling , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , W Ko , T Kobler , J Koch , T Kohler , J Kohne , M Kolander , H Kolanoski , F Kole , J Koll , S D Kolya , B Koppitz , V Korbel , M Korn , P Kostka , S K Kotelnikov , M W Krasny , H Krehbiel , F Krivan , D Krucker , U Kruger , U KrunerMarquis , M Kubantsev , J P Kubenka , T Kulper , H J Kusel , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , B Kuznik , B Laforge , F Lamarche , R Lander , M P J Landon , W Lange , R Langkau , P Lanius , J F Laporte , L Laptin , H Laskus , A Lebedev , M Lemler , U Lenhardt , A Leuschner , C Leverenz , S Levonian , D Lewin , C Ley , A Lindner , G Lindstrom , F Linsel , J Lipinski , B Liss , P Loch , A B Lodge , H Lohmander , G C Lopez , J P Lottin , V Lubimov , K Ludwig , D Luers , N Lugetski , B Lundberg , K Maeshima , N Magnussen , E Malinovski , S Mani , P Marage , J Marks , R Marshall , J Martens , F Martin , G Martin , R Martin , H U Martyn , J Martyniak , V Masbender , S Masson , A Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , J Meissner , D Mercer , T Merz , C A Meyer , H Meyer , J Meyer , S Mikocki , J L Mills , V Milone , J Mock , E Monnier , B Montes , F Moreau , J Moreels , B Morgan , J V Morris , J M Morton , K Muller , P Murin , S A Murray , V Nagovizin , B Naroska , T Naumann , P Nayman , A Nepeipivo , P Newman , D NewmanCoburn , D Newton , D Neyret , H K Nguyen , F Niebergall , C Niebuhr , R Nisius , T Novak , H Novakova , G Nowak , G W Noyes , M Nyberg , H Oberlack , U Obrock , J E Olsson , J Olszowska , S Orenstein , F OuldSaada , P Pailler , S Palanque , E Panaro , A Panitch , J Y Parey , C Pascaud , G D Patel , A Patoux , C Paulot , U Pein , E Peppel , E Perez , P Perrodo , A Perus , S Peters , J P Pharabod , H T Phillips , J P Phillips , C Pichler , A Pieuchot , W Pimpl , D Pitzl , A Porrovecchio , S Prell , R Prosi , H Quehl , G Radel , F Raupach , K Rauschnabel , A Reboux , P Reimer , G Reinmuth , S Reinshagen , P Ribarics , V Riech , J Riedlberger , H Riege , S Riess , M Rietz , S M Robertson , P Robmann , P Ropnack , R Roosen , K Rosenbauer , A Rostovtsev , C Royon , A Rudge , K Ruter , M Rudowicz , M Ruffer , S Rusakov , V Rusinov , K Rybicki , J Sacton , N Sahlmann , E Sanchez , D P C Sankey , M Savitski , P Schacht , S Schiek , N Schirm , S Schleif , P Schleper , W vonSchlippe , C Schmidt , D Schmidt , G Schmidt , W Schmitz , H Schmucker , V Schroder , J Schutt , E Schuhmann , M Schulz , A Schwind , W Scobel , U Seehausen , F Sefkow , R Sell , M Seman , A Semenov , P Shatalov , V Shekelyan , I Sheviakov , H Shooshtari , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , A Sirous , I O Skillicorn , P Skvaril , P Smirnov , J R Smith , L Smolik , D Sole , Y Soloviev , J Spalek , H Spitzer , R vonStaa , J Staeck , P Staroba , J Stastny , M Steenbock , P Stefan , P Steffen , R Steinberg , H Steiner , B Stella , K Stephens , J Stier , J Stiewe , U Stosslein , J Strachota , U Straumann , A Strowbridge , W Struczinski , J P Sutton , Z Szkutnik , G Tappern , S Tapprogge , R E Taylor , V Tchernyshov , V Tchudakov , C Thiebaux , K Thiele , G Thompson , R J Thompson , I Tichomirov , C Trenkel , W Tribanek , K Troger , P Truol , M Turiot , J Turnau , J Tutas , L Urban , M Urban , A Usik , S Valkar , A Valkarova , C Vallee , G VanBeek , M Vanderkelen , L VanLancker , P VanMechelen , A Vartapetian , Y Vazdik , M Vecko , P Verrecchia , R Vick , G Villet , E Vogel , K Wacker , M Wagener , I W Walker , A Walther , G Weber , D Wegener , A Wegner , P Weissbach , H P Wellisch , L West , D White , S Willard , M Winde , G G Winter , T Wolff , L A Womersley , A E Wright , E Wunsch , N Wulff , B E Wyborn , T P Yiou , J Zacek , D Zarbock , P Zavada , C Zeitnitz , Z Zhang , H Ziaeepour , M Zimmer , W Zimmermann , F Zomer , K Zuber (1997) The H1 detector at HERA NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 386: 2-3. 310-347 FEB 21 Abstract: General aspects of the H1 detector at the electron-proton storage ring HERA as well as technical descriptions of the magnet, luminosity system, trigger, slow-control, data acquisition and off-line data handling are given. The three major components of the detector, the tracking, calorimeter and muon detectors, will be described in a forthcoming article. The present paper describes the detector that was used from 1992 to the end of 1994. After this a major upgrade of some components was undertaken. Some performance figures from luminosity runs at HERA during 1993 and 1994 are given.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , M Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , W Bruckner , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , K T Donovan , J D Dowell , H B Dreis , A Droutskoi , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , W Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , H Genzel , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , W Hildesheim , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , D M Jansen , T Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , S Levonian , G Lindstrom , M Lindstroem , F Linsel , J Lipinski , B List , G Lobo , P Loch , J W Lomas , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , G W Noyes , T Nunnemann , M NybergWerther , M Oakden , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , B Povh , S Prell , K Rabbertz , G Radel , P Reimer , S Reinshagen , H Rick , F Riepenhausen , S Riess , E Rizvi , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , H Steiner , J Steinhart , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , J Tutas , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , K Zuber , M zurNedden (1997) Measurement of charged particle transverse momentum spectra in deep inelastic scattering NUCLEAR PHYSICS B 485: 1-2. 3-22 FEB 3 Abstract: Transverse momentum spectra of charged particles produced in deep inelastic scattering are measured as a function of the kinematic variables x and Q(2) using the H1 detector at the ep collider HERA. The data are compared to different parton emission models, either with or without ordering of the emissions in transverse momentum, The data provide evidence for a relatively large amount of parton radiation between the current and the remnant systems.
Notes:
S Aid , M Anderson , V Andreev , B Andrieu , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , M Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , V Boudry , A Braemer , W Braunschweig , V Brisson , W Bruckner , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , K T Donovan , J D Dowell , H B Dreis , A Droutskoi , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , W Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , H Genzel , R Gerhards , A Glazov , L Goerlich , D Goldner , K GolecBiernat , B GonzalezPineiro , N Gogitidze , M Goldberg , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , W Hildesheim , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , D M Jansen , T Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , S Levonian , G Lindstrom , M Lindstroem , F Linsel , J Lipinski , B List , G Lobo , P Loch , J W Lomas , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , G W Noyes , T Nunnemann , M NybergWerther , M Oakden , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , B Povh , S Prell , K Rabbertz , G Radel , P Reimer , S Reinshagen , H Rick , F Riepenhausen , S Riess , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , H Steiner , J Steinhart , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , R Todenhagen , P Truol , G Tsipolitis , J Turnau , J Tutas , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , K Zuber , M ZurNedden (1997) Scale influence on the energy dependence of photon-proton cross sections PHYSICS LETTERS B 392: 1-2. 234-242 JAN 23 Abstract: The scale dependence of the evolution of photoproduction cross sections with the photon-proton centre of mass energy W is studied using low Q(2) < 0.01 GeV2 e(+)p interactions collected by the Ill experiment at HERA. The value of the largest transverse momentum of a charged particle in the photon fragmentation region is used to define the hard scale. The slope of the W dependence of the cross section is observed to increase steeply with increasing transverse momentum. The result is compared to measurements of the Q(2) evolution of the W dependence of the virtual photon-proton cross section. Interpretations in terms of QCD and in terms of Regge phenomenology are discussed.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , H P Beck , M Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , W Bruckner , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , A DeRoeck , E A DeWolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , C Dollfus , K T Donovan , J D Dowell , H B Dreis , A Droutskoi , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenbandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , W Erdmann , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , H Genzel , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , W Hildesheim , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , A Jacholkowska , C Jacobsson , M Jacquet , M Jaffre , J Janoth , D M Jansen , T Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , B Laforge , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , G Lindstrom , M Lindstroem , F Linsel , J Lipinski , B List , G Lobo , P Loch , J W Lomas , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , M NybergWerther , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , S Prell , K Rabbertz , G Radel , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , L O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , H Steiner , J Steinhart , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , K J Theissen , C Thiebaux , G Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P VanEsch , P VanMechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , K Zuber , M zurNedden (1997) Diffraction dissociation in photoproduction at HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 74: 2. 221-235 APR Abstract: A study is presented of the process gamma p --> XY, where there is a large rapidity gap between the systems X and Y. Measurements are made of the differential cross section as a function of the invariant mass M-x of the system produced at the photon vertex. Results are presented at centre of mass energies of [W] = 187 G2V and [W] = 231 GeV, both where the proton dominantly remains intact and, for the first time, where it dissociates. Both the centre of mass energy and the M-x(2) dependence of HERA data and those from a fixed target experiment may simultaneously be described in a triple-Regge model. The low mass photon dissociation process is found to be dominated by diffraction, though a sizable subleading contribution is present at larger masses. The pomeron intercept is extracted and found to be alpha(p)(0) = 1.068 +/- 0.016 (stat.) +/- 0.022 (syst.) +/- 0.041 (model), in good agreement with values obtained from total and elastic hadronic and photoproduction cross sections. The diffractive contribution to the process gamma p --> Xp with M-x(2)/W-2 < 0.05 is measured to be 22.2 +/- 0.6 (stat.) +/- 2.6 (syst.) +/- 1.7 (model) % of the total gamma p cross section at [W] = 187 GeV.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , C Arndt , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , M Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , J Blumlein , K Borras , P Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , W Bruckner , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , K T Donovan , J D Dowell , H B Dreis , A Droutskoi , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , W Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , H Genzel , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , W Hildesheim , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , D M Jansen , T Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , H Krehbiel , D Krucker , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , S Levonian , G Lindstrom , M Lindstroem , F Linsel , J Lipinski , B List , P Lobo , P Loch , J W Lomas , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , G W Noyes , T Nunnemann , M NybergWerther , M Oakden , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , B Povh , S Prell , K Rabbertz , G Radel , P Reimer , S Reinshagen , S Riemersma , H Rick , F Riepenhausen , S Riess , E Rizvi , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , R Sell , Y Sirois , I O Skillicorn , P Smirnov , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , H Steiner , J Steinhart , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , J Tutas , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , K Zuber , M zurNedden (1997) Determination of the longitudinal proton structure function F-L(x,Q(2)) at low x PHYSICS LETTERS B 393: 3-4. 452-464 FEB 13 Abstract: A measurement of the inclusive cross section for the deep-inelastic scattering of positrons off protons at HERA is presented at momentum transfers 8.5 less than or equal to Q(2) less than or equal to 35 GeV2 and large inelasticity (y)=0.7, i.e. for the Bjorken-x range 0.00013 <x <0.00055. Using a next-to-leading order QCD fit to the structure function F-2 at lower y values, the contribution of F-2 to the measured cross section at high y is calculated and, by subtraction, the longitudinal structure function F-L is determined for the first time with an average value of F-L=0.52+/-0.03 (stat)(-0.22)(+0.25) (syst) at Q(2)=15.4 GeV2 and x=0.000243.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , H P Beck , M Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , R Beyer , P Biddulph , J C Bizot , K Borras , F Botterweck , V Boudry , S Bourov , A Braemer , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , C Brune , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , A DeRoeck , E A DeWolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , C Dollfus , K T Donovan , J D Dowell , H B Dreis , A Droutskoi , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , I Herynek , M F Hess , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , J Janoth , D M Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , F Linsel , J Lipinski , B List , G Lobo , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , H MahlkeKruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Nibergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P VanEsch , P VanMechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1997) Measurement of event shape variables in deep inelastic e p scattering PHYSICS LETTERS B 406: 3. 256-270 AUG 7 Abstract: Deep inelastic ep scattering data, taken with the H1 detector at HERA, are used to study the event shape variables thrust, jet broadening and jet mass in the current hemisphere of the Breit frame over a large range of momentum transfers Q between 7 GeV and 100 GeV. The data are compared with results from e(+)e(-) experiments. Using second order QCD calculations and an approach to relate hadronisation effects to power corrections an analysis of the e dependences of the means of the event shape parameters is presented, from which both the power corrections and the strong coupling constant are determined without any assumption on fragmentation models. The power corrections of all event shape variables investigated follow a 1/Q behaviour and can be described by a common parameter <(alpha)over bar>. (C) 1997 Published by Elsevier Science B,V.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , J Bahr , J Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , M Beck , A Babaev , H J Behrend , C Beier , A Belousov , C Berger , G Bernardi , G Bertrand-Coremans , R Beyer , P Biddulph , J C Bizot , K Borras , F Botterweck , V Boudry , S Bourov , A Braemer , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , C Brune , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , A De Roeck , E A De Wolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , B Gonzalez-Pineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , I Herynek , M F Hess , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , J Janoth , D M Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , J Lipinski , B List , G Lobo , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schiek , S Schleif , P Schleper , W von Schlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , K Stolze , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , J Zalesak , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , P Van Mechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Woilatz , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1997) Inclusive measurement of diffractive deep-inelastic ep scattering ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 76: 4. 613-629 DEC Abstract: A measurement is made of the cross section for the process ep --> eXY in deep-inelastic scattering with the HZ detector at HERA. The cross section is presented in terms of a differential structure function F-2(D(3))(x(p), beta, Q(2)) Of the proton over the kinematic range 4.5 < Q(2) < 75GeV(2) The dependence of F-2(D(3)) On x(p) is found to vary with beta, demonstrating that a factorisation of F-2(D(3)) with a single diffractive nux independent of beta and Q(2) is not tenable, An interpretation in which a leading diffractive exchange and a subleading reggeon contribute to F-2(D(3)) reproduces well the x(p) dependence of F-2(D(3)) with values for the pomeron and subleading reggeon intercepts of alpha(p)(0) = 1.203 +/- 0.020(stat.)+/-0.013(sys.)(-0.035)(+0.030)(model) and alpha(R)(0) = 0.50 +/- 0.11(stat.)+/-0.11(sys.)(-0.10)(+0.09)(model), respectively. A fit is performed of the data using a QCD motivated model, in which parton distributions are assigned to the leading and subleading exchanges. Bn this model, the majority of the momentum of the pomeron must be carried by gluons in order for the data to be well described.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , H P Beck , M Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , R Beyer , P Biddulph , P Bispham , J C Bizot , K Borras , F Botterweck , V Boudry , S Bourov , A Braemer , W Braunschweig , V Brisson , W Bruckner , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , B E Cox , G Cozzika , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , A DeRoeck , E A DeWolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , C Dollfus , K T Donovan , J D Dowell , H B Dreis , A Droutskoi , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , H Genzel , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , A Jacholkowska , C Jacobsson , M Jacquet , M Jaffre , J Janoth , D M Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , B Laforge , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , F Linsel , J Lipinski , B List , G Lobo , J W Lomas , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , H MahlkeKruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , K U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , T Walter , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , M NybergWerther , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , S Prell , K Rabbertz , G Radel , J Riedlberger , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P VanEsch , P VanMechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , R Wallny , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1997) Bose-Einstein correlations in deep inelastic ep scattering at HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 75: 3. 437-451 JUL Abstract: Two-particle correlations in invariant mass are studied separately for like-sign and unlike-sign charged particles produced in deep inelastic positron-proton scattering in a new kinematical domain. The data were taken with the H1 detector at the HERA storage ring in 1994, in which 27.5 GeV positrons collided with 820 GeV protons at a centre of mass energy root s=300 CeV. The observed enhancement of the like-sign correlations at low invariant masses is related to the dimensions of the hadronic source. The data are compared to different QCD models where the hadronization is performed with the string-fragmentation model. Results are presented for the first time separately for diffractive and non-diffractive scattering, in domains of four-momentum transfer, Bjorken-x, and hadronic center of mass energy, and in intervals of charged particle multiplicity. The observed source radii do not differ strongly from those measured in lower energy lepton-nucleon inelastic scattering, and e(+)e(-) annihilation.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , H P Beck , M Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , R Beyer , P Biddulph , P Bispham , J C Bizot , K Borras , F Botterweck , V Boudry , S Bourov , A Braemer , W Braunschweig , V Brisson , W Bruckner , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , B E Cox , G Cozzika , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , A DeRoeck , E A DeWolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , C Dollfus , K T Donovan , J D Dowell , H B Dreis , A Droutskoi , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , A Jacholkowska , C Jacobsson , M Jacquet , M Jaffre , J Janoth , D M Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , B Laforge , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , F Linsel , J Lipinski , B List , G Lobo , J W Lomas , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , H MahlkeKruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , T Walter , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , M NybergWerther , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , S Prell , K Rabbertz , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P VanEsch , P VanMechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , R Wallny , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1997) Evolution of ep fragmentation and multiplicity distributions in the Breit frame NUCLEAR PHYSICS B 504: 1-2. 3-23 OCT 27 Abstract: Low x deep-inelastic ep scattering data, taken in 1994 at the H1 detector at HERA, are analysed in the Breit frame of reference. The evolution of the peak and width of the current hemisphere fragmentation function is presented as a function of Q and compared with e(+)e(-) results at equivalent centre of mass energies. Differences between the average charged multiplicity and the multiplicity of e(+)e(-) annihilations at low energies are analysed, Invariant energy spectra are compared with MLLA predictions. Distributions of multiplicity are presented as functions of Bjorken-x and Q(2), and KNO scaling is discussed. (C) 1997 Elsevier Science B.V.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , C Beier , A Belousov , C Berger , G Bernardi , R Beyer , P Biddulph , J C Bizot , K Borras , F Botterweck , V Boudry , S Bourov , A Braemer , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , C Brune , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , A De Roeck , E A De Wolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , K T Donovan , J D Dowell , A Droutskoi , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , B Gonzalez-Pineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , S Hengstmann , H Henschel , I Herynek , M F Hess , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , J Janoth , D M Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , R Lahmann , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , J Lipinski , B List , G Lobo , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , H Mahlke-Kruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , J Scheins , S Schiek , S Schleif , P Schleper , W von Schlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , H C Schultz-Coulon , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , K Stolze , U Straumann , W Struczinski , J P Sutton , M Swart , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , J Zalesak , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P Van Esch , P Van Mechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M ZurNedden (1997) Low Q(2) jet production at HERA and virtual photon structure PHYSICS LETTERS B 415: 4. 418-434 DEC 25 Abstract: The transition between photoproduction and deep-inelastic scattering is investigated in jet production at the HERA ep collider, using data collected by the H1 experiment. Measurements of the differential inclusive jet cross-sections d sigma(ep)/dE(t)* and d sigma(ep)/d eta*, where E-t* and eta* are the transverse energy and the pseudorapidity of the jets in the virtual photon-proton centre of mass frame, are presented for 0 < Q(2) < 49 GeV2 and 0.3 < y < 0.6. The interpretation of the results in terms of the structure of the virtual photon is discussed. The data are best described by QCD calculations which include a partonic structure of the virtual photon that evolves with Q(2). (C) 1997 Published by Elsevier Science B.V.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , H P Beck , M Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , R Beyer , P Biddulph , P Bispham , J C Bizot , K Borras , F Botterweck , V Boudry , S Bourov , A Braemer , W Braunschweig , V Brisson , W Bruckner , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , B E Cox , G Cozzika , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , A DeRoeck , E A DeWolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , C Dollfus , K T Donovan , J D Dowell , H B Dreis , A Droutskoi , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , A Jacholkowska , C Jacobsson , M Jacquet , M Jaffre , J Janoth , D M Jansen , L Jonsson , K Johannsen , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , B Laforge , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , F Linsel , J Lipinski , B List , G Lobo , J W Lomas , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , H MahlkeKruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , T Walter , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , M NybergWerther , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , S Prell , K Rabbertz , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P VanEsch , P VanMechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , R Wallny , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1997) Photoproduction of K-0 and Lambda at HERA and a comparison with deep inelastic scattering ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 76: 2. 213-221 OCT Abstract: Inclusive K-0 and Lambda photoproduction has been investigated at HERA with the I-Il detector at an average photon-proton center of mass energy of 200 GeV in the transverse momentum range 0.5 < p(t) < 5 GeV. The production rates as a function of p(t) and center of mass rapidity are compared to those obtained in deep inelastic scattering at [Q(2)] = 23 GeV2. A similar comparison is made of the. rapidity spectra of charged particles. The rate of strangeness pho toproduction is compared with <p(p)over bar> measurements. The observations are also compared with next-to-leading order QCD calculations and the predictions of a Monte Carlo model.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , H P Beck , M Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , R Beyer , P Biddulph , P Bispham , J C Bizot , K Borras , F Botterweck , V Boudry , S Bourov , A Braemer , W Braunschweig , V Brisson , W Bruckner , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , B E Cox , G Cozzika , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , A DeRoeck , E A DeWolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , C Dollfus , K T Donovan , J D Dowell , H B Dreis , A Droutskoi , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , E Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , H Genzel , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , A Jacholkowska , C Jacobsson , M Jacquet , M Jaffre , J Janoth , D M Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , H Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , B Laforge , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , F Linsel , J Lipinski , B List , G Lobo , J W Lomas , G C Lopez , V Lubimov , D Luke , L Lytkin , N Magnussen , H MahlkeKruger , E Malinovski , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , T Walter , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , M NybergWerther , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , S Prell , K Rabbertz , G Radel , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P VanEsch , P VanMechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , R Wallny , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1997) A measurement of the proton structure function F-2(x, Q(2)) at low x and low Q(2) at HERA NUCLEAR PHYSICS B 497: 1-2. 3-28 JUL 21 Abstract: The results of a measurement of the proton structure function F-2(x,Q(2)) and the virtual photon-proton cross section are reported for momentum transfers squared Q(2) between 0.35 GeV2 and 3.5 GeV2 and for Bjorken-x values down to 6 x 10(-6) using data collected by the HERA experiment H1 in 1995, The data represent an increase in kinematic reach to lower x and Q(2) values of about a factor of 5 compared to previous H1 measurements. Including measurements from fixed target experiments the rise of F-2 with decreasing x is found to be less steep for the lowest Q(2) values measured, Phenomenological models at low Q(2) are compared with the data. (C) 1997 Elsevier Science B.V.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , V Arkadov , C Arndt , I Ayyaz , A Babaev , J Bahr , J Ban , P Baranov , E Barrelet , R Barschke , W Bartel , U Bassler , H P Beck , M Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , R Beyer , P Biddulph , J C Bizot , K Borras , F Botterweck , V Boudry , S Bourov , A Braemer , W Braunschweig , V Brisson , D P Brown , W Bruckner , P Bruel , D Bruncko , C Brune , J Burger , F W Busser , A Buniatian , S Burke , G Buschhorn , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , M C Cousinou , B E Cox , G Cozzika , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , A DeRoeck , E A DeWolf , B Delcourt , M Dirkmann , P Dixon , W Dlugosz , C Dollfus , K T Donovan , J D Dowell , H B Dreis , A Droutskoi , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , A B Fahr , L Favart , A Fedotov , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , J Formanek , J M Foster , G Franke , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , R Gerhards , A Glazov , L Goerlich , N Gogitidze , M Goldberg , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , T Hadig , D Haidt , L Hajduk , T Haller , M Hampel , W J Haynes , B Heinemann , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , K H Hiller , C D Hilton , J Hladky , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , C Issever , H Itterbeck , M Jacquet , M Jaffre , J Janoth , D M Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , S D Kolya , V Korbel , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , B Laforge , M P J Landon , W Lange , U Langenegger , A Lebedev , F Lehner , V Lemaitre , S Levonian , M Lindstroem , F Linsel , J Lipinski , B List , G Lobo , G C Lopez , V Lubimov , J Marks , D Luke , L Lytkin , N Magnussen , H MahlkeKruger , E Malinovski , R Maracek , P Marage , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , P Merkel , F Metlica , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , G Nowak , T Nunnemann , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , S Passaggio , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , R Poschl , G Pope , B Povh , K Rabbertz , P Reimer , H Rick , S Riess , E Rizvi , P Robmann , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , L Schoeffel , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , T Sloan , P Smirnov , M Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , P Steffen , R Steinberg , J Steinhart , B Stella , A Stellberger , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , G Thompson , P D Thompson , N Tobien , R Todenhagen , P Truol , G Tsipolitis , J Turnau , E Tzamariudaki , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P VanEsch , P VanMechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , R Wallny , T Walter , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , H Wollatz , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , M zurNedden (1997) Proton dissociative rho and elastic phi electroproduction at HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 75: 4. 607-618 AUG Abstract: The electroproduction of rho mesons with proton diffractive dissociation for Q(2) > 7 GeV2 and the elastic electroproduction of phi mesons for Q(2) > 6 GeV2 are studied in e(+)p collisions at HERA with the H1 detector, for an integrated luminosity of 2.8 pb(-1). The dependence of the cross sections on P-t(2) and Q(2) is measured, and the vector meson polarisation obtained. The cross section ratio between proton dissociative and elastic production of rho mesons is measured and discussed in the framework of the factorisation hypothesis of diffractive vertices. The ratio of the elastic cross section for phi and rho meson production is investigated as a function of Q(2).
Notes:
1996
S Aid , V Andreev , B Andrieu , R D Appuhn , M Arpagaus , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , H J Behrend , A Belousov , C Berger , G Bernardi , R Bernet , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , A J Campbell , T Carli , F Charles , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , D Dullmann , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , R J Ellison , E Elsen , M Erdmann , W Erdmann , E Evrard , A B Fahr , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , A Gellrich , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , R Grassler , T Greenshaw , R Griffiths , G Grindhammer , A Gruber , D Gruber , J Haack , D Haidt , L Hajduk , M Hampel , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , W Hildesheim , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , H Hufnagel , M Ibbotson , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , K Johannsen , D P Johnson , L JOhnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , F Kole , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , U Kruger , U KrunerMarquis , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , R Lander , M P J Landon , W Lange , U Langenegger , J F Laporte , A Lebedev , F Lehner , C Leverenz , S Levonian , C Ley , G Lindstrom , M Lindstroem , J Link , F Linsel , J Lipinski , B List , G Lobo , H Lohmander , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , T Merz , A Meyer , H Meyer , J Meyer , P O Meyer , A MIgliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , P R Newman , D Newton , D Neyret , H K Nguyen , T C NIcholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , U Obrock , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E PErez , J P Phillips , A Pieuchot , D Pitzl , G Pope , S Prell , R Prosi , K Rabbertz , G Radel , F Raupach , P Reimer , S Reinshagen , H Rick , V Riech , J Riedlberger , F Riepenhausen , S Riess , E Rizvi , S M Robertson , O P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , N Sahlmann , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , M Seidel , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , R Starosta , M Steenbock , P Steffen , R Steinberg , H Steiner , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , P Truol , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B A Waugh , G Weber , M Weber , M E Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , M Zimmer , F Zomer , J Zsembery , K Zuber , M zurNedden (1996) Elastic electroproduction of rho and J/psi mesons at large Q(2) at HERA NUCLEAR PHYSICS B 468: 1-2. 3-33 MAY 27 Abstract: The total cross sections for the elastic electroproduction of rho and J/psi mesons for Q(2) > 8 GeV2 and [W] similar or equal to 90 GeV/c(2) are measured at HERA with the H1 detector. The measurements are for an integrated electron-proton luminosity of similar or equal to 3 pb(-1). The dependences of the total virtual photon-proton (gamma*p) cross sections on Q(2), W and the momentum transfer squared to the proton (t), and, for the rho, the dependence on the polar decay angle (cos theta*), are presented. The J/psi:rho cross section ratio is determined. The results are discussed in the light of theoretical models and of the interplay of hard and soft physics processes.
Notes:
S Aid , V Andreev , B Andrieu , R D Appuhn , M Arpagaus , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , H J Behrend , A Belousov , C Berger , G Bernardi , R Bernet , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , A J Campbell , T Carli , F Charles , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , D Dullmann , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , R J Ellison , E Elsen , M Erdmann , W Erdmann , E Evrard , A B Fahr , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , A Gellrich , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , R Grassler , T Greenshaw , R Griffiths , G Grindhammer , A Gruber , C Gruber , J Haack , D Haidt , L Hajduk , M Hampel , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , W Hildesheim , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , H Hufnagel , M Ibbotson , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , K Johannsen , D P Johnson , L Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , F Kole , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , U Kruger , U KrunerMarquis , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , R Lander , M P J Landon , W Lange , U Langenegger , J F Laporte , A Lebedev , F Lehner , C Leverenz , S Levonian , C Ley , G Lindstrom , M Lindstroem , J Link , F Linsel , J Lipinski , B List , G Lobo , H Lohmander , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , T Merz , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , P R Newman , D Newton , D Neyret , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , U Obrock , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , G Pope , S Prell , R Prosi , K Rabbertz , G Radel , F Raupach , P Reimer , S Reinshagen , H Rick , V Riech , J Riedlberger , F Riepenhausen , S Riess , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , N Sahlmann , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , M Seidel , R Sell , A Semenov , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , R Starosta , M Steenbock , P Steffen , R Steinberg , H Steiner , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , P Truol , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , M Zimmer , F Zomer , J Zsembery , K Zuber , M zurNedden (1996) A search for squarks of Rp-violating SUSY at HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 71: 2. 211-226 JUN Abstract: A search for squarks of R-parity violating supersymmetry is performed in ep collisions at HERA using H1 1994 e(+) data. Direct single production of squarks of each generation by e(+)-quark fusion via a Yukawa coupling lambda' is considered. All possible R-parity violating decays and gauge decays of the squarks are taken into account. No significant deviation from the Standard Model predictions is found in the various multi-lepton and multi-jet final states studied and exclusion limits art derived. At 95% confidence level, the existence of first generation squarks is excluded for masses up to 240 GeV for coupling values lambda' greater than or similar to root 4 pi alpha(em). The limits obtained are shown to be only weakly dependent on the free parameters of the Minimal Supersymmetric Standard Model. Stop squarks are excluded for masses up to 138 GeV for coupling lambda' x cos theta(t) to e(+)d pairs greater than or similar to 0.1 x root 4 pi alpha(em) where theta t is the mass mixing angle. Light stop squarks are furthermore searched for through pair production in (sic)-gluon fusion processes. No signal is observed and exclusion limits are derived. Masses in the range 9 to 24.4 GeV are excluded at 95% confidence level for lambda' x cos theta(t) > 10(-4).
Notes:
S Aid , V Andreev , B Andrieu , R D Appuhn , M Arpagaus , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , H J Behrend , A Belousov , C Berger , G Bernardi , R Bernet , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , A J Campbell , T Carli , F Charles , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , C Coutures , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , D Dullmann , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , R J Ellison , E Elsen , M Erdmann , W Erdmann , E Evrard , A B Fahr , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , M Forbush , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , A Gellrich , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , R Grassler , T Greenshaw , R Griffiths , G Grindhammer , A Gruber , C Gruber , J Haack , D Haidt , L Hajduk , M Hampel , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , W Hildesheim , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , H Hufnagel , M Ibbotson , H Itterbeck , M A Jabiol , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , K Johannsen , D P Johnson , L Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , W Ko , T Kohler , J H Kohne , H Kolanoski , F Kole , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , U Kruger , U KrunerMarquis , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , F Lamarche , R Lander , M P J Landon , W Lange , U Langenegger , J F Laporte , A Lebedev , F Lehner , C Leverenz , S Levonian , C Ley , G Lindstrom , M Lindstroem , J Link , F Linsel , J Lipinski , B List , G Lobo , P Loch , H Lohmander , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , S Masson , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , T Merz , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , P R Newman , D Newton , D Neyret , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , U Obrock , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , S Prell , R Prosi , K Rabbertz , G Radel , F Raupach , P Reimer , S Reinshagen , H Rick , V Riech , J Riedlberger , F Riepenhausen , S Riess , M Rietz , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , N Sahlmann , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , M Seidel , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , R Starosta , M Steenbock , P Steffen , R Steinberg , H Steiner , B Stella , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , P Truol , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , M Zimmer , F Zomer , J Zsembery , K Zuber , M zurNedden (1996) Energy flow in the hadronic final state of diffractive and non-diffractive deep-inelastic scattering at HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 70: 4. 609-620 MAY Abstract: An investigation of the hadronic final state in diffractive and non-diffractive deep-inelastic electron-proton scattering at HERA is presented, where diffractive data are selected experimentally by demanding a large gap in pseudo-rapidity around the proton remnant direction. The transverse energy flow in the hadronic final state is evaluated using a set of estimators which quantify topological properties. Using available Monte Carlo QCD calculations, it is demonstrated that the final state in diffractive DIS exhibits the features expected if the interaction is interpreted as the scattering of an electron off a current quark with associated effects of perturbative QCD. A model in which deep-inelastic diffraction is taken to be the exchange of a pomeron with partonic structure is found to reproduce the measurements well. Models for deep-inelastic ep scattering, in which a sizeable diffractive contribution is present because of non-perturbative effects in the production of the hadronic final state, reproduce the general tendencies of the data but in all give a worse description.
Notes:
S Aid , V Andreev , B Andrieu , R D Appuhn , M Arpagaus , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , H J Behrend , A Belousov , C Berger , G Bernardi , R Bernet , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , D Bruncko , C Brune , R Bucholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , A J Campbell , T Carli , F Charles , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C COrmack , J A Coughlan , A Courau , M C Cousinou , C Coutures , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , L DelBuono , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , J Duboc , D Dullmann , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , R J Ellison , E Elsen , M Erdmann , W Erdmann , E Evrard , A B Fahr , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , M Forbush , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , A Gellrich , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , R Grassler , T Greenshaw , R Griffiths , G Grindhammer , A Gruber , C Gruber , J Haack , D Haidt , L Hajduk , O Hamon , M Hampel , M Hapke , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , W Hildesheim , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , H Hufnagel , M Ibbotson , H Itterbeck , M A Jabiol , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , K Johannsen , D P Johnson , L Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , W Ko , T Kohler , J H Kohne , H Kolanoski , F Kole , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , U Kruger , U KrunerMarquis , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , F Lamarche , R Lander , M P J Landon , W Lange , U Langenegger , P Lanius , J F Laporte , A Lebedev , F Lehner , C Leverenz , S Levonian , C Ley , G Lindstrom , M Lindstroem , J Link , F Linsel , J Lipinski , B List , G Lobo , P Loch , H Lohmander , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , S Masson , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , T Merz , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , P R Newman , D Newton , D Neyret , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , U Obrock , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , S Prell , R Prosi , K Rabbertz , G Radel , F Raupach , P Reimer , S Reinshagen , H Rick , V Riech , J Riedlberger , F Riepenhausen , S Riess , M Rietz , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , N Sahlmann , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , M Seidel , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , R Starosta , M Steenbock , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , P Truol , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B Waugh , G Weber , M Weber , D Wegener , A Wegner , H P Wellisch , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wunsch , T P Yiou , J Zacek , D Zarbock , Z Zhang , A Zhokin , M Zimmer , F Zomer , J Zsembery , K Zuber , M zurNedden (1996) A search for leptoquarks at HERA PHYSICS LETTERS B 369: 2. 173-185 FEB 22 Abstract: A search for leptoquarks at HERA was performed in H1 using 1994 e(+)p data corresponding to an integrated luminosity of about 3 pb(-1). Single leptoquarks were searched for in direct positron-quark fusion processes taking into account possible decays into lepton-quark pairs of either the first, the second, or the third generation. No significant deviation from the Standard Model predictions is found in the various final states studied and mass dependent exclusion limits are derived on the Yukawa couplings of the leptoquarks. Compared with earlier results from an analysis of e(-)p data, exclusion limits are considerably improved for leptoquarks which could be produced via e(+)-valence quark fusion. For leptoquarks with lepton flavour conserving couplings, masses up to 275 GeV (depending on the leptoquark type) are excluded for coupling values larger than root 4 pi alpha(cm). For leptoquarks with lepton flavour violating couplings, masses up to 225 GeV are excluded for couplings with leptons of the second or third generation larger than root 4 pi alpha(em). Fourteen possible combinations of couplings are studied and stringent exclusion limits comparable or better than any existing direct or indirect limits are obtained for each leptoquark type.
Notes:
S Aid , V Andreev , B Andrieu , R D Appuhn , M Arpagaus , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , H J Behrend , A Belousov , C Berger , G Bernardi , R Bernet , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , A J Campbell , T Carli , F Charles , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W B Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , D DUllmann , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , R J Ellison , E Elsen , M Erdmann , W Erdmann , E Evrard , A B Fahr , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K FLamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gaylor , M Gebauer , A Gellrich , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , R Grassler , T Greenshaw , R Griffiths , G Grindhammer , A Gruber , C Gruber , J Haack , D Haidt , L Hajduk , M Hampel , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , W Hildesheim , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , H Hufnagel , M Ibbotson , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , K Johannsen , D P Johnson , L Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , F KOle , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D KRucker , U Kruger , U KrunerMarquis , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , R Lander , M P J Landon , W Lange , U Langenegger , J F Laporte , A Lebedev , F LEhner , C LEverenz , S Levonian , C Ley , G Lindstrom , M Lindstroem , J LInk , F LInsel , J Lipinski , B List , G Lobo , H Lohmander , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , T Merz , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , P R Newman , D Newton , D Neyret , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , U Obrock , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , S Prell , R Prosi , K Rabbertz , G Radel , F Raupach , P Reimer , S Reinshagen , H Rick , V Riech , J Riedlberger , F Riepenhausen , S Riess , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , N Sahlmann , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , M Seidel , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , R Starosta , M Steenbock , P Steffen , R Steinberg , H Steiner , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , P Truol , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , M Zimmer , F Zomer , J Zsembery , K Zuber , M zurNedden (1996) A measurement and QCD analysis of the proton structure function F-2(x,Q(2)) at HERA NUCLEAR PHYSICS B 470: 1-2. 3-38 JUN 24 Abstract: A new measurement of the proton structure function F-2(x,Q(2)) is reported for momentum transfers squared Q(2) between 1.5 GeV2 and 5000 GeV2 and for Bjorken x between 3 . 10(-5) and 0.32 using data collected by the HERA experiment H1 in 1994. The data represent an increase in statistics by a factor of ten with respect to the analysis of the 1993 data, Substantial extension of the kinematic range towards low Q(2) and x has been achieved using dedicated data samples and events with initial state photon radiation. The structure function is found to increase significantly with decreasing x, even in the fewest accessible Q(2) region. The data are well described by a Next to Leading Order QCD fit and the gluon density is extracted.
Notes:
S Aid , V Andreev , B Andrieu , R D Appuhn , M Arpagaus , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , H J Behrend , A Belousov , C Berger , G Bernardi , R Bernet , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , S Bourov , A Braemer , F Brasse , W Braunschweig , V Brisson , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , A J Campbell , T Carli , F Charles , M Charlet , D Clarke , A B Clegg , B Clerbaux , J G Contreras , C Cormack , J A Coughlan , A Courau , C Coutures , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , L DelBuono , A DeRoeck , E A DeWolf , P Dixon , P DiNezza , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , J Duboc , D Dullmann , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , H Ehrlichmann , S Eichenberger , R Eichler , F Eisele , E Eisenhandler , R J Ellison , E Elsen , M Erdmann , W Erdmann , E Evrard , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , M Forbush , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , J Garvey , J Gayler , M Gebauer , A Gellrich , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D Goldner , B GonzalezPineiro , I Gorelov , P Goritchev , C Grab , H Grassler , R Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , J Haack , D Haidt , L Hajduk , O Hamon , M Hampel , M Hapke , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , W Hildesheim , P Hill , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , R Horisberger , V L Hudgson , P Huet , M Hutte , H Hufnagel , M Ibbotson , H Itterbeck , M A Jabiol , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , K Johannsen , D P Johnson , L Johnson , H Jung , P I P Kalmus , D Kant , R Kaschowitz , P Kasselmann , U Kathage , J Katzy , H H Kaufmann , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , W Ko , T Kohler , J H Kohne , H Kolanoski , F Kole , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , U Kruger , U KrunerMarquis , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , B Kuznik , D Lacour , B Laforge , F Lamarche , R Lander , M P J Landon , W Lange , P Lanius , J F Laporte , A Lebedev , F Lehner , C Leverenz , S Levonian , C Ley , G Lindstrom , J Link , F Linsel , J Lipinski , B List , G Lobo , P Loch , H Lohmander , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , S Masson , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , D Mercer , T Merz , A Meyer , C A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , F Moreau , J V Morris , E Mroczko , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , P R Newman , D Newton , D Neyret , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , U Obrock , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , C Pichler , A Pieuchot , D Pitzl , G Pope , S Prell , R Prosi , K Rabbertz , G Radel , F Raupach , P Reimer , S Reinshagen , P Ribarics , H Rick , V Riech , J Riedberger , S Riess , M Rietz , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , N Sahlmann , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , C Schwanenberger , G Sciacca , F Sefkow , M Seidel , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , J Spiekermann , S Spielman , H Spitzer , R Starosta , M Steenbock , P Steffen , R Steinberg , B Stella , K Stephens , J Stier , J Stiewe , U Stosslein , K Stolze , J Strachota , U Straumann , W Struczinski , J P Sutton , S Tapprogge , V Tchernyshov , J Theissen , C Thiebaux , G Thompson , P Truol , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , A Vartapetian , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B Waugh , G Weber , M Weber , D Wegener , A Wegner , H P Wellisch , L R West , S Willard , M Winde , G G Winter , C Wittek , A E Wright , E Wunsch , N Wulff , T P Yiou , J Zacek , D Zarbock , Z Zhang , A Zhokin , M Zimmer , W Zimmermann , F Zomer , J Zsembery , K Zuber , M zurNedden (1996) Jets and energy flow in photon proton collisions at HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 70: 1. 17-30 MAR Abstract: Properties of the hadronic final state in photoproduction events with large transverse energy are studied at the electron-proton collider HERA. Distributions of the transverse energy, jets and underlying event energy are compared to <(p)over bar p> data and QCD calculations. The comparisons show that the gamma p events can be consistently described by QCD models including - in addition to the primary hard scattering process - interactions between the two beam remnants. The differential jet cross sections d sigma/dE(T)(jet) and d sigma/d eta(jet) are measured.
Notes:
S Aid , V Andreev , B Andrieu , R D Appuhn , M Arpagaus , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , H J Behrend , A Belousov , C Berger , G Bernardi , R Bernet , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , A J Campbell , T Carli , F Charles , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , C Coutures , G Cozzika , L Criegee , D G Cussans , J Cvach , J B Dainton , W D Dau , K Daum , M David , S Dagoret , C L Davis , B Delcourt , A DeRoeck , E A DeWolfe , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , D Dullmann , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , R J Ellison , E Elsen , M Erdmann , W Erdmann , E Evrard , A B Fahr , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , M Forbush , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , A Gellrich , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , R Grassler , T Greenshaw , R Griffiths , G Grindhammer , A Gruber , C Gruber , J Haack , D Haidt , L Hajduk , M Hampel , M Hapke , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , W Hildesheim , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , H Hufnagel , M Ibbotson , H Itterbeck , M A Jabiol , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , K Johannsen , D P Johnson , L Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , W Ko , T Kohler , J H Kohne , H Kolanoski , F Kole , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , U Kruger , U KrunerMarquis , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , F Lamarche , R Lander , M P J Landon , W Lange , U Langenegger , P Lanius , J F Laporte , A Lebedev , F Lehner , C Leverenz , S Levonian , C Ley , G Lindstrom , M Lindstroem , J Link , F Linsel , J Lipinski , B List , G Lobo , P Loch , H Lohmander , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , S Masson , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , T Merz , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , P R Newman , D Newton , D Neyret , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , U Obrock , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , S Prell , R Prosi , K Rabbertz , G Radel , F Raupach , P Reimer , S Reinshagen , H Rick , V Riech , J Riedlberger , F Riepenhausen , S Riess , M Rietz , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , N Sahlmann , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , M Seidel , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , R Starosta , M Steenbock , P Steffen , R Steinberg , H Steiner , B Stella , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , P Truol , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B Waugh , G Weber , M Weber , D Wegener , A Wegner , H P Wellisch , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , M Zimmer , F Zomer , J Zsembery , K Zuber , M zurNedden (1996) Elastic photoproduction of rho(0) mesons at HERA NUCLEAR PHYSICS B 463: 1. 3-29 MAR 18 Abstract: The cross section for the elastic photoproduction of rho(0) mesons (gamma p --> rho(0)p) has been measured with the H1 detector at HERA for two average photon-proton centre-of-mass energies of 55 and 187 GeV. The lower energy point was measured by observing directly the rho(0) decay giving a cross section of 9.1 +/- 0.9 (stat.) +/- 2.5 (syst.) mu b. The logarithmic slope parameter of the differential cross section, d sigma/dt, is found to be 10.9 +/- 2.4 (stat.) +/- 1.1 (syst.) GeV-2. The rho(0) decay polar angular distribution is found to be consistent with s-channel helicity conservation, The higher energy cross section was determined from analysis of the lower part of the hadronic invariant mass spectrum of diffractive photoproduction and found to be 13.6 +/- 0.8 (stat.) +/- 2.4(syst.) mu b.
Notes:
S Aid , V Andreev , B Andrieu , R D Appuhn , M Arpagaus , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , H J Behrend , A Belousov , C Berger , G Bernardi , R Bernet , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , A J Campbell , T Carli , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , D Dullmann , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , O Eichler , F Eisele , E Eisenhandler , R J Ellison , E Elsen , M Erdmann , W Erdmann , E Evrard , A B Fahr , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , A Gellrich , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , R Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , J Haack , T Hadig , D Haidt , L Hajduk , M Hampel , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , W Hildesheim , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , H Hufnagel , M Ibbotson , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , K Johannsen , D P Johnson , L Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , F Kole , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , U Kruger , U KrunerMarquis , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , R Lander , M P J Landon , W Lange , U Langenegger , J F Laporte , A Lebedev , F Lehner , C Leverenz , S Levonian , C Ley , G Lindstrom , M Lindstroem , J Link , F Linsel , J Lipinski , B List , G Lobo , H Lohmander , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , T Merz , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , P R Newman , D Newton , D Neyret , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , U Obrock , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D PItzl , G Pope , S Prell , R Prosi , K Rabbertz , G Radel , F Raupach , P Reimer , S Reinshagen , H Rick , V Riech , J Riedlberger , F Riepenhausen , S Riess , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , N Sahlmann , D P C Sankey , P Schacht , S Scharein , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , M Seidel , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , R Starosta , M Steenbock , P Steffen , R Steinberg , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , P Truol , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , F Zomer , J Zsembery , K Zuber , M ZurNedden (1996) A search for selectrons and squarks at HERA PHYSICS LETTERS B 380: 3-4. 461-470 JUL 11 Abstract: Data from electron-proton collisions at a center-of-mass energy of 300 GeV are used for a search for selectrons and squarks within the framework of the minimal supersymmetric model. The decays of selectrons and squarks into the lightest supersymmetric particle lead to final states with an electron and hadrons accompanied by large missing energy and transverse momentum. No signal is found and new bounds on the existence of these particles are derived. At 95% confidence level the excluded region extends to 65 GeV for selectron and squark masses, and to 40 GeV for the mass of the lightest supersymmetric particle.
Notes:
S Aid , M Anderson , V Andreev , B Andrieu , R D Appuhn , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , W Erdmann , E Evrard , A B Fahr , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , J Haack , T Hadig , D Haidt , L Hajduk , M Hampel , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , W Hildesheim , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , F Kole , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , R Lander , M P J Landon , W Lange , U Langenegger , J F Laporte , A Lebedev , F Lehner , S Levonian , G Lindstrom , M Lindstroem , J Link , F Linsel , J Lipinksi , B List , G Lobo , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , M Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , S Prell , K Rabbertz , G Radel , P Reimer , S Reinshagen , H Rick , V Riech , J Riedlberger , F Riepenhausen , S Riess , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Rutter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , M Seidel , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , M Steenbock , P Steffen , R Steinberg , H Steiner , J Steinhart , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaus , G Thompson , P Truol , G Tsipolitis , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , K Zuber , M zurNedden (1996) Charged particle multiplicities in deep inelastic scattering at HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 72: 4. 573-592 NOV Abstract: Using the H1 detector at HERA, charged particle multiplicity distributions in deep inelastic e(+)p scattering have been measured over a large kinematical region. The evolution with W and Q(2) of the multiplicity distribution and of the multiplicity moments in pseudorapidity domains of varying size is studied in the current fragmentation region of the hadronic centre-of-mass frame. The results are compared with data from fixed target lepton-nucleon interactions, e(+)e(-) annihilations and hadron-hadron collisions as well as with expectations from QCD based parton models. Fits to the Negative Binomial and Lognormal distributions are resented.
Notes:
C Adloff , S Aid , M Anderson , V Andreev , B Andrieu , R D Appuhn , C Arndt , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , P Bruel , D Bruncko , C Brune , R Buckholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , W Erdmann , E Evrard , A B Fahr , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , J Haack , T Hadig , D Haidt , L Hajduk , M Hampel , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , W Hildesheim , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , M Kausch , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , F Kole , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , A Kupper , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , R Lander , M P J Landou , W Lange , U Langenegger , J F Laporte , A Lebedev , F Lehner , S Levonian , G Lindstrom , M Lindstroem , J Link , F Linsel , J Lipinski , B List , G Lobo , P Loch , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , S Prell , K Rabbertz , G Radel , P Reimer , S Reinshagen , H Rick , V Riech , J Riedlberger , F Riepenhausen , S Riess , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , M Seidel , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , M Steenbock , P Steffen , R Steinberg , H Steiner , J Steinhart , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , T J Theissen , C Thiebaux , G Thompson , P Truol , K Tzamariudaki , G Tsipolitis , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , S Wiesand , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , K Zuber , M zurNedden (1996) Inclusive D-0 and D*(+/-) production in neutral current deep inelastic ep scattering at HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 72: 4. 593-605 NOV Abstract: First results on inclusive D-0 and D-*+/- production in neutral current deep inelastic ep scattering are reported using data collected by the H1 experiment at HERA in 1994. Differential cross sections are presented for both channels and are found to agree well with QCD predictions based on the boson gluon fusion process. A charm production cross section for 10 GeV2 less than or equal to Q(2) less than or equal to 100 GeV2 and 0.01 less than or equal to y less than or equal to 0.7 of sigma (ep --> <ec(c)over bar X>) = (17.4 +/- 1.6 +/- 1.7 +/- 1.4) nb is derived. A first measurement of the charm contribution F(2)(<c(c)over bar>) (x, Q(2)) to the proton structure function for Bjorken x between 8 . 10(-4) and 8 . 10(-3) is presented. In this kinematic range a ratio F(2)(<c(c)over bar>)/F-2 = 0.237 +/- 0.021 +/- 0.041 is observed.
Notes:
S Aid , V Andreev , B Andrieu , R D Appuhn , M Arpagaus , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , H J Behrend , A Belousov , C Berger , G Bernardi , R Bernet , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , A J Campbell , T Carli , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , D Dullmann , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , R J Ellison , E Elsen , M Erdmann , W Erdmann , E Evrard , A B Fahr , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , A Gellrich , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , R Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , J Haack , T Hadig , D Haidt , L Hajduk , M Hampel , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , W Hildesheim , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , H Hufnagel , M Ibbotson , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , K Johannsen , D P Johnson , L Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , F Kole , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , U Kruger , U KrunerMarquis , H Huster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , R Lander , M P J Landon , W Lange , U Langenegger , J F Laporte , A Lebedev , F Lehner , C Leverenz , S Levonian , C Ley , G Lindstrom , M Linstroem , J Link , F Linsel , J Lipinski , B List , G Lobo , H Lohmander , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , T Merz , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , P R Newman , D Newton , D Neyret , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , U Obrock , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , S Prell , R Prosi , K Rabbertz , G Radel , F Raupach , P Reimer , S Reinshagen , H Rick , V Riech , J Riedberger , F Riepenhausen , S Riess , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , N Sahlmann , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , M Seidel , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , R Starosta , M Steenbock , P Steffen , R Steinberg , H Steiner , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , P Truol , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B Waugh , G Weber , M Weber , M Wegener , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , F Zomer , J Zsembery , K Zuber , M zurNedden (1996) Photoproduction of D-*+/- mesons in electron-proton collisions at HERA NUCLEAR PHYSICS B 472: 1-2. 32-51 JUL 22 Abstract: At the electron-proton collider HERA the inclusive D-*+/- meson photoproduction cross section has been measured with the H1 detector in two different, but partly overlapping, kinematical regions. For the first, where [W-gamma p] approximate to 200 GeV and Q(2) < 0.01 GeV2, the result is sigma(gamma p --> c(c) over barX$) = (13.2 +/- 2.2(-1.7-4.8)(+2.1+9.9)) mu b. The second measurement for Q(2) < 4 GeV2 yields sigma(gamma p) --> c(c) over barX$) = (9.3 +/- 2.1(-1.8-3.2)(+1.9+6.9)) mu b at [W-gamma p] approximate to 142 GeV and sigma(gamma p --> c(c) over barX$) = (20.6 +/- 5.5(-3.9-7.2)(+4.3+15.4)) mu b at [W-gamma p] approximate to 230 GeV, respectively. The third error accounts for an additional uncertainty due to the proton and photon parton density parametrizations. Differential cross sections are presented as a function of the D-*+/- transverse momentum and rapidity. The results compare reasonably well with next-to-leading order QCD calculations. Evidence for diffractive photoproduction of charm quarks is presented.
Notes:
S Aid , M Anderson , V Andreev , B Andrieu , R D Appuhn , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H J Behrend , A Belousov , C Berger , G Bernardi , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , P Bruel , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , D Calvet , A J Campbell , T Carli , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , A DeRoeck , E A DeWolf , B Delcourt , P DiNezza , M Dirkmann , P Dixon , W Dlugosz , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , E Elsen , M Erdmann , W Erdmann , E Evrard , A B Fahr , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , T Greenshaw , R K Griffiths , G Grindhammer , A Gruber , C Gruber , J Haack , T Hadig , D Haidt , L Hajduk , M Hampel , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , K Hewitt , W Hildesheim , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , M Ibbotson , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , D P Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , F Kole , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , R Lander , M P J Landon , W Lange , U Langenegger , J F Laporte , A Lebedev , F Lehner , J Lipinski , B List , G Lobo , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , M Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , I Negri , P R Newman , D Newton , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , S Prell , K Rabbertz , G Radel , P Reimer , S Reinshagen , H Rick , V Riech , J Riedlberger , F Riepenhausen , S Riess , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , M Seidel , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , M Steenbock , P Steffen , R Steinberg , H Steiner , J Steinhart , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , P Truol , G Tsipolitis , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , P VanEsch , P VanMechelen , D Vandenplas , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , M Wobisch , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , P Zini , F Zomer , J Zsembery , K Zuber , M zurNedden (1996) Strangeness production in deep-inelastic positron-proton scattering at HERA NUCLEAR PHYSICS B 480: 1-2. 3-34 NOV 25 Abstract: Measurements of K-0 meson and Lambda baryon production in deep-inelastic positron-proton scattering (DIS) are presented in the kinematic range 10 < Q(2) < 70 GeV2 and 10(-4) < x < 10(-2),The measurements, obtained using the H1 detector at the HERA collider, are discussed in the light of possible mechanisms for increased strangeness production at low Bjorken-x. Comparisons of the x(F) spectra, where x(F) is the fractional longitudinal momentum in the hadronic centre-of-mass frame, are made with results from electron-positron annihilation. The x(F) spectra and the K-0 ''seagull'' plot are compared with previous DIS results. The mean K-0 and Lambda multiplicities are studied as a function of the centre-of-mass energy W and are observed to be consistent with a logarithmic increase with W when compared with previous measurements, A comparison of strangeness production in diffractive and non-diffractive DIS is made. An upper limit of 0.9 nb, at the 95% confidence level, is placed on the cross section for QCD instanton induced events.
Notes:
S Aid , V Andreev , B Andrieu , R D Appuhn , M Arpagaus , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , E Beck , H J Behrend , A Belousov , C Berger , G Bernardi , R Bernet , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , A J Campbell , T Carli , F Charles , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , D Dullmann , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , R J Ellison , E Elsen , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , K Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , A Gellrich , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D GOldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , G Grassler , R Grassler , T Greenshaw , R Griffiths , G Grindhammer , A Gruber , C Gruber , J Haack , D Haidt , L Hajduk , M Hampel , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , W Hildesheim , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , H Hufnagel , M Ibbotson , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , K Johannsen , D P Johnson , L Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , D Kaufmann , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , F Kole , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , D Krucker , U Kruger , U KrunerMarquis , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , R Lander , M P J Landon , W Lange , U Langenegger , J F Laporte , A Lebedev , F Lehner , C Leverenz , S Levonian , C Ley , G Lindstrom , M Lindstroem , J Link , F Linsel , J Lipinski , B List , G Lobo , H Lohmander , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , T Merz , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , P R Newman , D Newton , D Neyret , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , U Obrock , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , S Prell , R Prosi , K Rabbertz , G Radel , F Raupach , P Reimer , S Reinshagen , H Rick , V Riech , J Riedlberger , F Riepenhausen , S Riess , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovtsev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , N Sahlmann , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , M Seidel , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , R Starosta , M Steenbock , P Steffen , R Steinberg , H Steiner , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Sturczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , P Truol , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , M Zimmer , F Zomer , J Zsembery , K Zuber , M zurNedden (1996) Elastic and inelastic photoproduction of J/psi mesons at HERA NUCLEAR PHYSICS B 472: 1-2. 3-31 JUL 22 Abstract: Results on J/psi production in ep interactions in the Hi experiment at HERA are presented. The J/psi mesons are produced by almost real photons (Q(2) approximate to 0) and detected via their leptonic decays. The data have been taken in 1994 and correspond to an integrated luminosity of 2.7 pb(-1). The yp cross section for elastic J/psi production is observed to increase strongly with the center of mass energy. The cross section for diffractive J/psi production with proton dissociation is found to be of similar magnitude as the elastic cross section. Distributions of transverse momentum and decay angle are studied and found to be in accord with a diffractive production mechanism. For inelastic J/psi production the total yp cross section, the distribution of transverse momenta, and the elasticity of the J/psi are compared to NLO QCD calculations in a colour singlet model and agreement is found. Diffractive psi' production has been observed and a first estimate of the ratio to J/psi production in the HERA energy regime is given.
Notes:
S Aid , V Andreev , B Andrieu , R D Appuhn , M Arpagaus , A Babaev , J Bahr , J Ban , Y Ban , P Baranov , E Barrelet , R Barschke , W Bartel , M Barth , U Bassler , H P Beck , H J Behrend , A Belousov , C Berger , G Bernardi , R Bernet , G BertrandCoremans , M Besancon , R Beyer , P Biddulph , P Bispham , J C Bizot , V Blobel , K Borras , F Botterweck , V Boudry , A Braemer , W Braunschweig , V Brisson , D Bruncko , C Brune , R Buchholz , L Bungener , J Burger , F W Busser , A Buniatian , S Burke , M J Burton , G Buschhorn , A J Campbell , T Carli , M Charlet , D Clarke , A B Clegg , B Clerbaux , S Cocks , J G Contreras , C Cormack , J A Coughlan , A Courau , M C Cousinou , G Cozzika , L Criegee , D G Cussans , J Cvach , S Dagoret , J B Dainton , W D Dau , K Daum , M David , C L Davis , B Delcourt , A DeRoeck , E A DeWolf , M Dirkmann , P Dixon , P DiNezza , W Dlugosz , C Dollfus , J D Dowell , H B Dreis , A Droutskoi , D Dullmann , O Dunger , H Duhm , J Ebert , T R Ebert , G Eckerlin , V Efremenko , S Egli , R Eichler , F Eisele , E Eisenhandler , R J Ellison , E Elsen , M Erdmann , W Erdmann , E Evrard , A B Fahr , L Favart , A Fedotov , D Feeken , R Felst , J Feltesse , J Ferencei , F Ferrarotto , K Flamm , M Fleischer , M Flieser , G Flugge , A Fomenko , B Fominykh , J Formanek , J M Foster , G Franke , E Fretwurst , E Gabathuler , F Gaede , J Garvey , J Gayler , M Gebauer , A Gellrich , H Genzel , R Gerhards , A Glazov , U Goerlach , L Goerlich , N Gogitidze , M Goldberg , D Goldner , K GolecBiernat , B GonzalezPineiro , I Gorelov , C Grab , H Grassler , R Grassler , T Greenshaw , R Griffiths , G Grindhammer , A Gruber , C Gruber , J Haack , D Haidt , L Hajduk , M Hampel , M Hapke , W J Haynes , G Heinzelmann , R C W Henderson , H Henschel , I Herynek , M F Hess , W Hildesheim , K H Hiller , C D Hilton , J Hladky , K C Hoeger , M Hoppner , D Hoffmann , T Holtom , R Horisberger , V L Hudgson , M Hutte , H Hufnagel , M Ibbotson , H Itterbeck , A Jacholkowska , C Jacobsson , M Jaffre , J Janoth , T Jansen , L Jonsson , K Johannsen , D P Johnson , L Johnson , H Jung , P I P Kalmus , M Kander , D Kant , R Kaschowitz , U Kathage , J Katzy , H H Kaufmann , O Kaufmann , S Kazarian , I R Kenyon , S Kermiche , C Keuker , C Kiesling , M Klein , C Kleinwort , G Knies , T Kohler , J H Kohne , H Kolanoski , F Kole , S D Kolya , V Korbel , M Korn , P Kostka , S K Kotelnikov , T Kramerkamper , M W Krasny , H Krehbiel , U Krucker , U KrunerMarquis , H Kuster , M Kuhlen , T Kurca , J Kurzhofer , D Lacour , B Laforge , R Lander , M P J Landon , W Lange , U Langenegger , J F Laporte , A Lebedev , F Lehner , C Leverenz , S Levonian , C Ley , G Lindstrom , M Lindstroem , J Link , F Linsel , J Lipinski , B List , G Lobo , H Lohmander , J W Lomas , G C Lopez , V Lubimov , D Luke , N Magnussen , E Malinovski , S Mani , R Maracek , P Marage , J Marks , R Marshall , J Martens , G Martin , R Martin , H U Martyn , J Martyniak , T Mavroidis , S J Maxfield , S J McMahon , A Mehta , K Meier , T Merz , A Meyer , H Meyer , J Meyer , P O Meyer , A Migliori , S Mikocki , D Milstead , J Moeck , F Moreau , J V Morris , E Mroczko , D Muller , G Muller , K Muller , P Murin , V Nagovizin , R Nahnhauer , B Naroska , T Naumann , P R Newman , D Newton , D Neyret , H K Nguyen , T C Nicholls , F Niebergall , C Niebuhr , C Niedzballa , H Niggli , R Nisius , G Nowak , G W Noyes , M NybergWerther , M Oakden , H Oberlack , U Obrock , J E Olsson , D Ozerov , P Palmen , E Panaro , A Panitch , C Pascaud , G D Patel , H Pawletta , E Peppel , E Perez , J P Phillips , A Pieuchot , D Pitzl , G Pope , S Prell , R Prosi , K Rabbertz , G Radel , F Raupach , P Reimer , S Reinshagen , H Rick , V Riech , J Riedlberger , F Riepenhausen , S Riess , E Rizvi , S M Robertson , P Robmann , H E Roloff , R Roosen , K Rosenbauer , A Rostovstev , F Rouse , C Royon , K Ruter , S Rusakov , K Rybicki , N Sahlmann , D P C Sankey , P Schacht , S Schiek , S Schleif , P Schleper , W vonSchlippe , D Schmidt , G Schmidt , A Schoning , V Schroder , E Schuhmann , B Schwab , F Sefkow , M Seidel , R Sell , A Semenov , V Shekelyan , I Sheviakov , L N Shtarkov , G Siegmon , U Siewert , Y Sirois , I O Skillicorn , P Smirnov , J R Smith , V Solochenko , Y Soloviev , A Specka , J Spiekermann , S Spielman , H Spitzer , F Squinabol , R Starosta , M Steenbock , P Steffen , R Steinberg , H Steiner , B Stella , A Stellberger , J Stier , J Stiewe , U Stosslein , K Stolze , U Straumann , W Struczinski , J P Sutton , S Tapprogge , M Tasevsky , V Tchernyshov , S Tchetchelnitski , J Theissen , C Thiebaux , G Thompson , P Truol , J Turnau , J Tutas , P Uelkes , A Usik , S Valkar , A Valkarova , C Vallee , D Vandenplas , P VanEsch , P VanMechelen , Y Vazdik , P Verrecchia , G Villet , K Wacker , A Wagener , M Wagener , A Walther , B Waugh , G Weber , M Weber , D Wegener , A Wegner , T Wengler , M Werner , L R West , T Wilksen , S Willard , M Winde , G G Winter , C Wittek , E Wunsch , J Zacek , D Zarbock , Z Zhang , A Zhokin , F Zomer , J Zsembery , K Zuber , M ZurNedden (1996) Measurement of the Q(2) dependence of the charged and neutral current cross sections in E(+/-)p scattering at HERA PHYSICS LETTERS B 379: 1-4. 319-329 JUN 27 Abstract: The Q(2) dependence and the total cross sections for charged and neutral current processes are measured in e(+/-)p reactions for transverse momenta of the outgoing lepton larger than 25 GeV. Comparable size of cross sections for the neutral current process and for the weak charged current process are observed above Q(2) approximate to 5000 GeV2. Using the shape and magnitude of the charged current cross section we determine a propagator mass of m(w) = 84(-7)(+10) GeV.
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1995
S AID T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAEHR , P BARANOV , E BARRELET , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , B BRISSON , D BRUNCKO , C BRUNE , R BUSCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , B CLERBAUX , M COLOMBO , J G CONTRERAS , C CORMACK , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , J B DAINTON , WD DAN M DANILOV , K DAUM , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , A DROUTSKOI , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S D EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , H HAPKE , W J HAYNES , J HEATHERINGTON , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , V L HUDGSON , P HUET , M HUTTE , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , J KATZY , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , J KOHNE , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , T KRAMERKAMPER , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , B LIST , P LOCH , H LOHMANDER , G C LOPEZ , V LUBIMOV , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , E MROCZKO , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , T C NICHOLLS , F NIEBERGALL , C NIEBUHR , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , D OZEROV , E PANARO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , D PITZL , G POPE , S PRELL , R PROSI , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , H RICK , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , E RIZVI , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROSSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , S SCHIEK , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , A SCHWIND , U SEEHAUSEN , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , V SOLOCHENKO , Y SOLOVIEV , J SPIEKERMANN , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , K STOLZE , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , I W WALKER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , A ZHOKIN , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER (1995) EXPERIMENTAL-STUDY OF HARD PHOTON RADIATION PROCESSES AT HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 66: 4. 529-542 MAY Abstract: We present an experimental study of the ep --> e gamma + p and ep --> e gamma + X processes using data recorded by the H1 detector in 1993 at the electron-proton collider HERA. These processes are employed to measure the luminosity with an accuracy of 4.5 %. A subsample of the ep --> e gamma + X events in which the hard photon is detected at angles theta'(gamma) less than or equal to 0.45 mrad with respect to the incident electron direction is used to verify experimentally the size of radiative corrections to the ep --> eX inclusive cross section and to investigate the structure of the proton in the Q(2) domain down to 2 GeV2, lower than previously attained at HERA.
Notes:
S AID , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAEHR , Y BAN , P BARANOV , E BARRELET , R BARSCHKE , W BARTEL , M BRATH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , P BISPHAM , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , M BURTON , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , M CHARLET , D CLARKE , A B CLEGG , B CLERBAUX , M COLOMBO , J G CONTRERAS , C CORMACK , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , WD DAU J B DAINTON , K DAUM , M DAVID , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , A DROUTSKOI , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , W J HAYNES , J HEATHERINGTON , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , V L HUDGSON , P HUET , M HUTTE , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , C JACOBSSON , D P JOHNSON , L JONSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , J KATZY , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , J H KOHNE , H KOLANOSKI , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , T KRAMERKAMPER , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , J LINK , F LINSEL , J LIPINSKI , B LIST , G LOBO , P LOCH , H LOHMANDER , J LOMAS , G C LOPEZ , V LUBIMOV , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , A MIGLIORI , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , E MROCZKO , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , T C NICHOLLS , F NIEBERGALL , C NIEBUHR , C NIEDZBALLA , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , M OAKDEN , H OBERLACK , U OBROCK , J E OLSSON , D OZEROV , E PANARO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , A PIEUCHOT , D PITZL , G POPE , S PRELL , R PROSI , K RABBERTZ , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , H RICK , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , E RIZVI , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , E SANCHEZ , D P C SANKEY , P SCHACHT , S SCHIEK , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , A SCHWIND , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , V SOLOCHENKO , Y SOLOVIEV , J SPIEKERMANN , S SPIELMANN , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , K STOLZE , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , I W WALKER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , C WITTEK , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , A ZHOKIN , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER (1995) A STUDY OF THE FRAGMENTATION OF QUARKS IN E(-)P COLLISIONS AT HERA NUCLEAR PHYSICS B 445: 1. 3-21 JUL 3 Abstract: Deep inelastic scattering (DIS) events, selected from 1993 data taken by the H1 experiment at HERA, are studied in the Breit frame of reference. The fragmentation function of the quark is compared with those of e(+)e(-) data. It is shown that certain aspects of the quarks emerging from within the proton in e(-)p interactions are essentially the same as those of quarks pair-created from the vacuum in e(+)e(-) annihilation. The measured area, peak position and width of the fragmentation function show that the kinematic evolution variable, equivalent to the e(+)e(-) squared centre of mass energy, is in the Breit frame the invariant square of the four-momentum transfer. We comment on the extent to which we have evidence for coherence effects in parton showers.
Notes:
S AID T AHMED , A AKHUNDOVA , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAEHR , P BARANOV , E BARRELET , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , B CLERBAUX , M COLOMBO , J G CONTRERAS , C CORMACK , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , J B DAINTON , WD DAU M DANILOV , K DAUM , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , V DROUTSKOI , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , K GAMERDINER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , W J HAYNES , J HEATHERINGTON , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , L HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , V L HUDGSON , P HUET , M HUTTE , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P L P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , J KATZY , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , J KOHNE , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , T KRAMERKAMPER , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , B LIST , P LOCH , H LOHMANDER , G C LOPEZ , V LUBIMOV , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , E MROCZKO , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , T C NICHOLLS , F NIEBERGALL , C NIEBUHR , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , M OAKDEN , H OBERLACK , U OBROCK , J E OLSSON , E PANARO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , D PITZL , G POPE , S PRELL , R PROSI , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , H RICK , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , E RIZVI , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , S SCHIEK , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , A SCHWIND , U SEEHAUSEN , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , Y SOLOVIEV , J SPIEKERMANN , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , R E TYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , I W WALKER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , A ZHOKIN , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER (1995) A MEASUREMENT OF THE PROTON STRUCTURE-FUNCTION F-2(X,Q(2)) NUCLEAR PHYSICS B 439: 3. 471-502 APR 17 Abstract: A measurement of the proton structure function F-2(x, Q(2)) is reported for momentum transfers squared Q(2) between 4.5 GeV2 and 1600 GeV2 and for Bjorken x between 1.8 x 10(-4) and 0.13 using data collected by the HERA experiment H1 in 1993. It is observed that F-2 increases significantly with decreasing x, confirming our previous measurement made with one tenth of the data available in this analysis. The Q(2) dependence is approximately logarithmic over the full kinematic range covered. The subsample of deep inelastic events with a large pseudo-rapidity gap in the hadronic energy flow close to the proton remnant is used to measure the ''diffractive'' contribution to F-2.
Notes:
S AID T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAEHR , P BARANOV , E BARRELET , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , B CLERBAUX , M COLOMBO , J G CONTRERAS , C CORMACK , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , J B DAINTON , WD DAU M DANILOV , K DAUM , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , A DROUTSKOI , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , W J HAYNES , J HEATHERINGTON , G HEINZELMANN , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , P HUET , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , J H KOHNE , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , T KRAMERKAMPER , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , B LIST , P LOCH , H LOHMANDER , G C LOPEZ , V LUBIMOV , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , C NIEBUHR , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , M OAKDEN , H OBERLACK , U OBROCK , J E OLSSON , E PANARO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , D PITZL , G POPE , S PRELL , R PROSI , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , H RICK , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , S SCHIEK , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , A SCHWIND , U SEEHAUSEN , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , Y SOLOVIEV , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , I W WALKER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , A ZHOKIN , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER (1995) DETERMINATION OF THE STRONG-COUPLING CONSTANT FROM JET RATES IN DEEP-INELASTIC SCATTERING PHYSICS LETTERS B 346: 3-4. 415-425 MAR 9 Abstract: Jet rates in deep inelastic electron proton scattering are studied with the H1 detector at HERA for momentum transfers squared between 10 and 4000 GeV2. It is shown that they can be quantitatively described by perturbative QCD in next to leading order making use of the parton densities of the proton and with the strong coupling constant alpha(s) as a free parameter. The measured value, alpha( )(M(Z)(2)) = 0.123 +/- 0.018, is in agreement both with determinations from e(+)e(-) annihilation at LEP The using the same observable and with the world average.
Notes:
S AID , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAHR , Y BAN , P BARANOV , E BARRELET , R BARSCHKE , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , P BISPHAM , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , M J BURTON , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , M CHARLET , D CLARKE , A B CLEGG , B CLERBAUX , J G CONTERAS , C CORMACK , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , WD DAU J B DAINTON , K DAUM , M DAVID , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , A DROUTSKOI , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , A GLAZOV , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , M HAPKE , W J HAYNES , J HEATHERINGTON , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , V L HUDGSON , P HUET , M HUTTE , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , J KATZY , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , J H KOHNE , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , T KRAMERKAMPER , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , F LEHNER , C LEVERENZ , C LEY S LEVONIAN , G LINDSTROM , J LINK , F LINSEL , J LIPINSKI , B LIST , G LOBO , P LOCH , H LOHMANDER , J W LOMAS , G C LOPEZ , V LUBIMOV , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , G MARTIN , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , A MEYER , C A MEYER , H MEYER , J MEYER , A MIGLIORI , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , E MROCZKO , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , T C NICHOLLS , F NIEBERGALL , C NIEBUHR , C NIEDZBALLA , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , M OAKDEN , H OBERLACK , U OBROCK , J E OLSSON , D OZEROV , E PARANO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHER , D PITZL , G POPE , S PRELL , R PROSI , K RABBERTZ , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , H RICK , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , E RIZVI , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , D P C SANKEY , P SCHACHT , S SCHIEK , S SCHLEIF , P SCHLEPER , W VONSCHLIPPE , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , G SCIACCA , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , V SOLOCHENKO , Y SOLOVIEV , J SPIEKERMANN , S SPIELMANN , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , K STOLZE , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , D VANDENPLAS , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , C WITTEK , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , A ZHOKIN , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER , M ZURNEDDEN (1995) LEPTOQUARKS AND COMPOSITENESS SCALES FROM A CONTACT INTERACTION ANALYSIS OF DEEP-INELASTIC E(+/-)P SCATTERING AT HERA PHYSICS LETTERS B 353: 4. 578-588 JUL 6 Abstract: A contact interaction analysis is presented to search for new phenomena beyond the Standard Model in deep inelastic e(+/-)p-->e(+/-) hadrons scattering. The data are collected with the H1 detector at HERA and correspond to integrated luminosities of 0.909 pb(-1) and 2.947 pb(-1) for electron and positron beams, respectively. The differential cross sections d sigma/dQ(2) are measured in the Q(2) range between 160 GeV2 and 20000 GeV2. The absence of any significant deviation from the Standard Model prediction is used to constrain the couplings and masses of new leptoquarks and to set limits on electron-quark compositeness scales and on the radius of light quarks.
Notes:
S AID T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAEHR , P BARANOV , E BARRELET , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , B CLERBAUX , M COLOMBO , J G CONTRERAS , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , M DAVID , J B DAINTON , WD DAU M DANILOV , K DAUM , E DEFFUR , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , V DROUTSKOI , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , W J HAYNES , J HEATHERINGTON , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , P HUET , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , T KRAMERKAMPER , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , B LIST , P LOCH , H LOHMANDER , G C LOPEZ , V LUBIMOV , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , C NIEBUHR , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , H OBERLACK , U OBROCK , J E OLSSON , E PANARO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , D PITZL , G POPE , S PRELL , R PROSI , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , H RICK , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , S SCHIEK , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , A SCHWIND , U SEEHAUSEN , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , Y SOLOVIEV , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , I W WALKER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , A ZHOKIN , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER (1995) OBSERVATION OF HARD PROCESSES IN RAPIDITY GAP EVENTS IN GAMMA-P INTERACTIONS AT HERA NUCLEAR PHYSICS B 435: 1-2. 3-20 FEB 6 Abstract: Events with no hadronic energy flow in a large interval of pseudo-rapidity in the proton direction are observed in photon-proton interactions at an average centre of mass energy [root S(gamma)p] of 200 GeV. These events are interpreted as photon diffractive dissociation. Evidence for hard scattering in photon diffractive dissociation is demonstrated using inclusive single particle spectra, thrust as a function of transverse energy, and the observation of jet production. The data can be described by a Monte Carlo calculation including hard photon-pomeron scattering.
Notes:
S AID T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAEHR , Y BAN , P BARANOV , E BARRELET , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , P BISPHAM , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , M BURTON , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , B CLERBAUX , M COLOMBO , J G CONTRERAS , C CORMACK , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , WD DAU J B DAINTON , K DAUM , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , A DROUTSKOI , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , W J HAYNES , J HEATHERINGTON , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , V L HUDGSON , P HUET , M HUTTE , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , J KATZY , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , J H KOHNE , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , T KRAMERKAMPER , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , J LINK , F LINSEL , J LIPINSKI , B LIST , G LOBO , P LOCH , H LOHMANDER , J LOMAS , G C LOPEZ , V LUBIMOV , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , E MROCZKO , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , T C NICHOLLS , F NIEBERGALL , C NIEBUHR , C NIEDZBALLA , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , M OAKDEN , H OBERLACK , U OBROCK , J E OLSSON , D OZEROV , E PANARO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , D PITZL , G POPE , S PRELL , R PROSI , K RABBERTZ , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , H RICK , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , E RIZVI , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , E SANCHEZ , D P C SANKEY , P SCHACHT , S SCHIEK , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , A SCHWIND , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , V SOLOCHENKO , Y SOLOVIEV , J SPIEKERMANN , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , K STOLZE , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , I W WALKER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , C WITTEK , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , A ZHOKIN , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER (1995) FIRST MEASUREMENT OF THE DEEP-INELASTIC STRUCTURE OF PROTON DIFFRACTION PHYSICS LETTERS B 348: 3-4. 681-696 APR 6 Abstract: A measurement is presented, using data taken with the H1 detector at HERA, of the contribution of diffractive interactions to deep-inelastic electron-proton (ep) scattering in the kinematic range 8.5 < Q(2) < 50 GeV2, 2.4 x 10(-4) < Bjorken-x < 0.0133, and 3.7 x 10(-4) < xp < 0.043. The diffractive contribution to the proton structure function F-2(x, e2) is evaluated as a function of the appropriate deep-inelastic scattering variables xp, Q(2), and beta (= x/xp) using a class of deep-inelastic ep scattering events with no hadronic energy flow in an interval of pseudo-rapidity adjacent to the proton beam direction. The dependence of this contribution on xp is measured to be xp(-n) with n = 1.19 +/- 0.06(stat.) +/- 0.07(syst.) independent of beta and Q(2), which is consistent with both a diffractive interpretation and a factorisable ep diffractive cross section. A first measurement of the deep-inelastic structure of the pomeron in the form of the Q(2) and beta dependences of a factorised structure function is presented. For all measured beta, this structure function is observed to be consistent with scale invariance.
Notes:
S AID , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAEHR , Y BAN , P BARANOV , E BARRELET , R BARSCHKE , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , P BISPHAM , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , M BURTON , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , M CHARLET , D CLARKE , A B CLEGG , B CLERBAUX , M COLOMBO , J G CONTRERAS , C CORMACK , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , WD DAU J B DAINTON , K DAUM , M DAVID , B DELCOURT , L DEBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , A DROUTSKOI , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , W J HAYNES , J HEATHERINGTON , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , V L HUDGSON , P HUET , M HUTTE , M A JABIOL , A JACHOLKOWSKA , H HUFNAGEL , M IBBOTSON , H ITTERBECK , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , J KATZY , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , J H KOHNE , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , T KRAMERKAMPER , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , J LINK , F LINSEL , J LIPINSKI , B LIST , G LOBO , P LOCH , H LOHMANDER , J LOMAS , G C LOPEZ , V LUBIMOV , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , A MIGLIORI , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , E MROCZKO , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , T C NICHOLLS , F NIEBERGALL , C NIEBUHR , C NIEDZBALLA , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , M OAKDEN , H OBERLACK , U OBROCK , J E OLSSON , D OZEROV , E PANARO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , A PIEUCHOT , D PITZL , G POPE , S PRELL , R PROSI , K RABBERTZ , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , H RICK , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , E RIZVI , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , E SANCHEZ , D P C SANKEY , P SCHACHT , S SCHIEK , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , A SCHWIND , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , V SOLOCHENKO , Y SOLOVIEV , J SPIEKERMANN , S SPIELMAN , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , K STOLZE , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , I W WALKER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , C WITTEK , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , A ZHOKIN , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER (1995) THE GLUON DENSITY OF THE PROTON AT LOW-X FROM A QCD ANALYSIS OF F2 PHYSICS LETTERS B 354: 3-4. 494-505 JUL 20 Abstract: We present a QCD analysis of the proton structure function F-2 measured by the H1 experiment at HERA, combined with data from previous fixed target experiments. The gluon density is extracted from the scaling violations of F-2 in the range 2.10(-4) < x < 3.10(-2) and compared with an approximate solution of the QCD evolution equations. The gluon density is found to rise steeply with decreasing x.
Notes:
S AID T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAEHR , Y BAN , P BARANOV , E BARRELET , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , P BISPHAM , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , M BURTON , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , M CHARLET , D CLARKE , A B CLEGG , B CLERBAUX , M COLOMBO , J G CONTRERAS , C CORMACK , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , WD DAU J B DAINTON , K DAUM , M DAVID , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , A DROUTSKOI , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , W J HAYNES , J HEATHERINGTON , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , V L HUDGSON , P HUET , M HUTTE , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , J KATZY , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , J H KOHNE , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , T KRAMERKAMPER , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , J LINK , F LINSEL , J LIPINSKI , B LIST , G LOBO , P LOCH , H LOHMANDER , J LOMAS , G C LOPEZ , V LUBIMOV , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , A MIGLIORI , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , E MROCZKO , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , T C NICHOLLS , F NIEBERGALL , C NIEBUHR , C NIEDZBALLA , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , M OAKDEN , H OBERLACK , U OBROCK , J E OLSSON , D OZEROV , E PANARO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , A PIEUCHOT , D PITZL , G POPE , S PRELL , R PROSI , K RABBERTZ , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , H RICK , V RIECH , J RIEDLBERGER , S REISS , M RIETZ , E RIZVI , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , S G SALESCH , E SANCHEZ , D P C SANKEY , P SCHACHT , S SCHIEK , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , A SCHWIND , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , V SOLOCHENKO , Y SOLOVIEV , J SPIEKERMANN , S SPIELMAN , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , K STOLZE , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , I W WALKER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , C WITTEK , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , A ZHOKIN , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER (1995) INCLUSIVE PARTON CROSS-SECTIONS IN PHOTOPRODUCTION AND PHOTON STRUCTURE NUCLEAR PHYSICS B 445: 2-3. 195-217 JUL 10 Abstract: Photoproduction of 2-jet events is studied with the H1 detector at HERA. Parton cross sections are extracted from the data by an unfolding method using leading order parton-jet correlations of a QCD generator. The gluon distribution in the photon is derived in the fractional momentum range 0.04 less than or equal to x(gamma) less than or equal to 1 at the average factorization scale 75 GeV2.
Notes:
S AID , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAHR , Y BAN , P BARANOV , E BARRELET , R BARSCHKE , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , P BISPHAM , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , S BOUROV , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATINA , S BURKE , M J BURTON , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , M CHARLET , D CLARKE , A B CLEGG , B CLERBAUX , J G CONTRERAS , C CORMACK , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , WD DAU J B DAINTON , K DAUM , M DAVID , C L DAVIS , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DIXON , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , A DROUTSKOI , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , A GLAZOV , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , R K GRIFFITHS , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , M HAPKE , W J HAYNES , G HEINZELMAN , R C W HENDERSON , H HENSCHEL , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , V L HUDGSON , P HUET , M HUTTE , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , J KATZY , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , J H KOHNE , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTA , S K KOTELNIKOV , T KRAMERKAMPER , M W KRASNY , B KUZNIK , D LACOUR , B LAFORGE , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , F LEHNER , C LEVERENZ , C LEY S LEVONIAN , G LINDSTROM , J LINK , F LINSEL , J LIPINSKI , B LIST , G LOBO , P LOCH , H LOHMANDER , J W LOMAS , G C LOPEZ , V LUBIMOV , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , G MARTIN , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , A MEYER , C A MEYER , H MEYER , J MEYER , P O MEYER , A MIGLIORI , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , E MROCZKO , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , T C NICHOLLS , F NIEBERGALL , C NIEBUHR , C NIEDZBALLA , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , M OAKDEN , H OBERLACK , U OBROCK , J E OLSSON , D OZEROV , P PALMEN , E PANARO , A PANITCH , C PASCAUD , G D PATEL , H PAWLETTA , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , A PIEUCHOT , D PITZL , G POPE , S PRELL , R PROSI , K RABBERTZ , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , H RICK , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , E RIZVI , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROSSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , N SAHLMANN , D P C SANKEY , P SCHACHT , S SCHIEK , S SCHLEIF , P SCHLEPER , W VONSCHLIPPE , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHULMANN , B SCHWAB , G SCIACCA , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , L O SKILLICORN , P SMIRNOV , J R SMITH , V SOLOCHENKO , Y SOLOVIEV , J SPIEKERMANN , S SPIELMAN , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , K STOLZE , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , V TCHERNYSHOV , J THEISSEN , C THIEBAUX , G THOMPSON , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , D VANDENPLAS , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , A WALTHER , B WAUGH , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , C WITTEK , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , A ZHOKIN , M ZIMMER , W ZIMMERMANN , F ZOMER , J ZSEMBERY , K ZUBER , M ZURNEDDEN (1995) MEASUREMENT OF THE TOTAL PHOTON PROTON CROSS-SECTION AND ITS DECOMPOSITION AT 200 GEV CENTER-OF-MASS ENERGY ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 69: 1. 27-38 DEC Abstract: We present a new measurement of the total photoproduction cross section performed with the H1 detector at HERA. For an average centre of mass energy of 200 GeV a value of sigma(tot)(gamma p) - 165 +/- 2 +/- 11 mu b has been obtained. A detailed analysis of the data in adequate kinematic regions enabled a decomposition of the total cross section in its elastic, single diffractive dissociation and remaining non-diffractive parts, based on safe assumptions on the double diffractive dissociation contribution.
Notes:
S AID , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAHR , Y BAN , P BARANOV , E BARRELET , R BARSCHKE , W BARTEL , M BARTH , U BASSLER , H P BEEK , H J BEHREND , A BELOUSOV , C BERGER , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , P BISPHAM , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , M J BURTON , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , M CHARLET , D CLARKE , A B CLEGG , B CLERBAUX , M COLOMBO , J G CONTRERAS , C CORMACK , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , WD DAU J B DAINTON , K DAUM , M DAVID , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , A DROUTSKOI , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , A GLAZOV , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , M HAPKE , W J HAYNES , J HEATHERINGTON , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , V L HUDGSON , P HUET , M HUTTE , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , J KATZY , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , J H KOHNE , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , T KRAMERKAMPER , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , F LEHNER , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINSTROM , J LINK , F LINSEL , J LIPINSKI , B LIST , G LOBO , P LOCH , H LOHMANDER , J W LOMAS , G C LOPEZ , V LUBIMOV , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , G MARTIN , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , A MEYER , C A MEYER , H MEYER , J MEYER , A MIGLIORI , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , E MROCZKO , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , T C NICHOLLS , F NIEBERGALL , C NIEBUHR , C NIEDZBALLA , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , M OAKDEN , H OBERLACK , U OBROCK , J E OLSSON , D OZEROV , E PANARO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , A PIEUCHOT , D PITZL , G POPE , S PRELL , R PROSI , K RABBERTZ , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , H RICK , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , E RIZVI , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , D P C SANKEY , P SCHACHT , S SCHIEK , S SCHLEIF , P SCHLEPER , W VONSCHLIPPE , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , G SCIACCA , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , V SOLOCHENKO , Y SOLOVIEV , J SPIEKERMANN , S SPIELMAN , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , K STOLZE , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , D VANDENPLAS , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , C WITTEK , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , A ZHOKIN , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER , M ZURNEDDEN (1995) A DIRECT DETERMINATION OF THE GLUON DENSITY IN THE PROTON AT LOW-X NUCLEAR PHYSICS B 449: 1-2. 3-21 AUG 28 Abstract: A leading order determination of the gluon density in the proton has been performed in the fractional momentum range 1.9 . 10(-3) < x(g/p) < 0.1.8 by measuring multi-jet events from boson-gluon fusion in deep-inelastic scattering with the H1 detector at the electron-proton collider HERA. This direct determination of the gluon density was performed in a kinematic region previously not accessible. The data show a considerable increase of the gluon density with decreasing fractional momenta of the gluons.
Notes:
S AID , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAHR , Y BAN , P BARANOV , E BARRELET , R BARSCHKE , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , P BISPHAM , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , S BOUROV , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , M J BURTON , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , M CHARLET , D CLARKE , A B CLEGG , B CLERBAUX , J G CONTRERAS , C CORMACK , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , WD DAU J B DAINTON , K DAUM , M DAVID , C L DAVIS , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DIXON , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , A DROUTSKOI , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , A GLAZOV , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , R GRIFFITHS , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , M HAPKE , W J HAYNES , J HEATHERINGTON , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , V L HUDGSON , P HUET , M HUTTE , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , J KATZY , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , J H KOHNE , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , T KRAMERKAMPER , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , B LAFORGE , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , F LEHNER , C LEVERENZ , C LEY S LEVONIAN , G LINDSTROM , J LINK , F LINSEL , J LIPINSKI , B LIST , G LOBO , P LOCH , H LOHMANDER , J W LOMAS , G C LOPEZ , V LUBIMOV , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , G MARTIN , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , A MEYER , C A MEYER , H MEYER , J MEYER , P O MEYER , A MIGLIORI , S MIKOCKI , D SMILSTEAD , F MOREAU , J V MORRIS , E MROCZKO , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , T C NICHOLLS , F NIEBERGALL , P R NIEBUHR , C NIEDZBALLA , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , M OAKDEN , H OBERLACK , U OBROCK , J E OLSSON , D OZEROV , P PALMEN , E PANARO , A PANITCH , C PASCAUD , G D PATEL , H PAWLETTA , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , A PIEUCHOT , D PITZL , G POPE , S PRELL , R PROSI , K RABBERTZ , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , H RICK , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , E RIZVI , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , D P C SANKEY , P SCHACHT , S SCHIEK , S SCHLEIF , P SCHLEPER , W VONSCHLIPPE , D SCHMIDT , G SCHMIDT , A SCHONIG , V SCHRODER , E SCHUHMANN , B SCHWAB , G SCIACCA , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , V SOLOCHENKO , Y SOLOVIEV , J SPIEKERMANN , S SPIELMAN , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , S STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , K STOLZE , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , V TCHERNYSHOV , J THEISSEN , C THIEBAUX , G THOMPSON , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , D VANDENPLAS , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , A WALTHER , B WAUGH , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , C WITTEK , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , Z ZHOKIN , M ZIMMER , W ZIMMERMANN , F ZOMER , J ZSEMBERY , K ZUBER , M ZURNEDDEN (1995) COMPARISON OF DEEP-INELASTIC SCATTERING WITH PHOTOPRODUCTION INTERACTIONS AT HERA PHYSICS LETTERS B 358: 3-4. 412-422 SEP 28 Abstract: Photon-proton (gamma p) interactions with Q(2) < 10(-2) GeV2 and deep-inelastic scattering (gamma*p) interactions with photon virtualities Q(2) > 5 GeV2 are studied at the high energy electron-proton collider HERA. The transverse energy flow and relative rates of large rapidity gap events are compared in the two event samples. The observed similarity between yp and gamma*p interactions can be understood in a picture where the photon develops as a hadronic object. The transverse energy density measured in the central region of the collision, at eta* = 0 in the gamma*p centre of mass frame, is compared with data from hadron-hadron interactions as function of the CMS energy of the collision.
Notes:
S AID , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAHR , Y BAN , P BARANOV , E BARRELET , R BARSCHKE , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , P BISPHAM , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , M J BURTON , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , M CHARLET , D CLARKE , A B CLEGG , B CLERBAUX , M COLOMBO , J G CONTRERAS , C CORMACK , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , WD DAU J B DAINTON , K DAUM , M DAVID , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , A DROUTSKOI , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , P FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , A GLAZOV , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , M HAPKE , W J HAYNES , J HEATHERINGTON , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , V L HUDGSON , P HUET , M HUTTE , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE (1995) TRANSVERSE ENERGY AND FORWARD JET PRODUCTION IN THE LOW-X REGIME AT HERA PHYSICS LETTERS B 356: 1. 118-128 AUG 10 Abstract: The production of transverse energy in deep inelastic scattering is measured as a function of the kinematic variables x and Q(2) using the H1 detector at the ep collider HERA. The results are compared to the different predictions based upon two alternative QCD evolution equations, namely the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) and the Balitsky-Fadin-Kuraev-Lipatov (BFKL) equations. In a pseudorapidity interval which is central in the hadronic centre of mass system between the current and the proton remnant fragmentation region the produced transverse energy increases with decreasing x for constant Q(2). Such a behaviour can be explained with a QCD calculation based upon the BFKL ansatz. The rate of forward jets, proposed as a signature for BFKL dynamics, has been measured.
Notes:
S AID , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAHR , Y BAN , P BARANOV , E BARRELET , R BARSCHKE , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , P BISPHAM , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , M J BURTON , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , M CHARLET , D CLARKE , A B CLEGG , B CLERBAUX , M COLOMBO , J G CONTREAS , C CORMACK , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , WD DAU J B DAINTON , K DAUM , M DAVID , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , A DROUTSKOI , J DOBUC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , A GLAZOV , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , M HAPKE , W J HAYNES , J HEATHERINGTON , G HEINZELMAN , R C W HENDERSON , H HENSCHEL , I HERYNEK , M F HESS , W HILDERSHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , V L HUDGSON , P HUET , M HUTTE , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , J KATZY , H H KAUFMANN , S KAZARIAN , L R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , J H KOHNE , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , T KRAMERKAMPER , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , F LEHNER , C LEVERENZ , C LEY S LEVONIAN , G LINDSTROM , J LINK , F LINSEL , J LIPINSKI , B LIST , G LOBO , P LOCH , H LOHMANDER , J W LOMAS , G C LOPEZ , V LUBIMOV , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , G MARTIN , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , A MEYER , C A MEYER , H MEYER , J MEYER , A MIGLIORI , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , E MROCZKO , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , T C NICHOLLS , F NIEBERGALL , C NIEBUHR , C NIEDZBALLA , R NISIUS , G NOWAK , G W NOYES , H K NYBERGWERTHER , M OAKDEN , H OBERLACK , U OBROCK , J E OLSSON , D OZEROV , E PANARO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , A PIEUCHOT , D PITZL , G POPE , S PRELL , R PROSI , K RABBERTZ , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , H RICH , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , E RIZVI , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , D P C SANKEY , P SCHACHT , S SCHIEK , S SCHLEIF , P SCHLEPER , W VONSCHLIPPE , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , G SCIACCA , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , V SOLOCHENKO , Y SOLOVIEV , J SPIEKERMANN , S SPIELMAN , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , K STOLZE , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , D VANDENPLAS , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , C WITTEK , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , Z ZHOKIN , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER , M ZURNEDDEN (1995) MEASUREMENT OF THE E(+) AND E(-) INDUCED CHARGED CURRENT CROSS-SECTIONS AT HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 67: 4. 565-575 AUG Abstract: The cross sections for the charged current processes e(-) p --> v(e) + hadrons and, for the first time, e(+) p --> ($) over bar v(e) + ($) over bar v(e) + hadrons are measured at HERA for transverse momenta larger than 25 GeV.
Notes:
1994
I ABT , T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN H BARWOLFF , P BARANOV , E BARRELET , W BARTEL , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , P BIDDULPH , E BINDER , A BISCHOFF , J C BIZOT , V BLOBEL , K BORRAS , P C BOSETTI , V BOUDRY , C BOURDARIOS , F BRASSE , U BRAUN , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , M COLOMBO , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , J CVACH , S DAGORET , J B DAINTON , M DANILOV , WD DAU A W E DANN , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , M DEVEL , A DEROECK , P DINGUS , C DOLLFUS , J D DOWELL , H B DREIS , A DRESCHER , J DUBOC , D DULLMANN , O DUNGER , H DUHM , R EBBINGHAUS , M EBERLE , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , N N ELLIS , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , I F FENSOME , J FERENCEI , F FERRAROTTO , K FLAMM , W FLAUGER , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , P FUHRMANN , E GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , A GELLRICH , M GENNIS , H GENZEL , R GERHARDS , L GODFREY , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , H GRIEF , G GRINDHAMMER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , D HANDSCHUH , E M HANLON , M HAPKE , J HARJES , R HAYDAR , W J HAYNES , J HEATHERINGTON , V HEDBERG , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , W HILDESHEIM , P HILL , C D HILTON , J HLADKY , K C HOEGER , P HUET , H HUFNAGEL , N HUOT , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , S KASARIAN , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , R LANGKAU , P LANIUS , J F LAPORTE , A LEBEDEV , A LEUSCHNER , C LEVERENZ , S LEVONIAN , C LEY D LEWIN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , P LOCH , H LOHMANDER , G C LOPEZ , D LUERS , N MAGNUSSEN , E MALINOVSKI , S MANI , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , A MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , V MILONE , E MONNIER , F MOREAU , J MOREELS , J V MORRIS , K MULLER , P MURIN , S A MURRAY , V NAGOVIZIN , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , C NIEBUHR , R NISIUS , G NOWAK , G W NOYES , M NYBERG , H OBERLACK , U OBROCK , J E OLSSON , S ORENSTEIN , F OULDSAADA , C PASCAUD , G D PATEL , E PEPPEL , S PETERS , H T PHILLIPS , J P PHILLIPS , C PICHLER , W PILGRAM , D PITZL , S PRELL , R PROSI , G RADEL , F RAUPACH , K RAUSCHNABEL , P REIMER , S REINSHAGEN , P RIBARICS , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , S M ROBERTSON , P ROBMANN , R ROOSEN , A ROSTOVTSEV , C ROYON , M RUDOWICZ , M RUFFER , S RUSAKOV , K RYBICKI , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , W SCHMITZ , A SCHONING , V SCHRODER , M SCHULZ , B SCHWAB , A SCHWIND , W SCOBEL , U SEEHAUSEN , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , L SMOLIK , Y SOLOVIEV , H SPITZER , P STAROBA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , I TICHOMIROV , P TRUOL , J TURNAU , J TUTAS , L URBAN , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , R VICK , G VILLET , E VOGEL , K WACKER , I W WALKER , A WALTHER , G WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , T WOLFF , L A WOMERSLEY , A E WRIGHT , N WULFF , T P YIOU , J ZACEK , P ZAVADA , C ZEITNITZ , H ZIAEEPOUR , M ZIMMER , W ZIMMERMANN , F ZOMER (1994) A MEASUREMENT OF MULTI-JET RATES IN DEEP-INELASTIC SCATTERING AT HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 61: 1. 59-66 JAN Abstract: Multi-jet production is observed in deep-inelastic electron proton scattering with the H1 detector at HERA. Jet rates for momentum transfers squared up to 500 GeV2 are determined using the JADE jet clustering algorithm. They are found to be in agreement with predictions from QCD based models.
Notes:
I ABT , T AHMED , S AID V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , H BARWOLFF , J BAIN , P BARANOV , E BARRELET , W BARTEL , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESACON , P BIDDDULPH , E BINDER , J C BIZOT , V BLOBEL , K BORRAS , P C BOSETTI , V BOUDRY , C BOURDARIOUS , A BRAEMER , F BRASSE , U BRAUN , W BRAUNSCHWEIG , V BRISSON , D BRUNDKO , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , J CYYLA , D CLARKE , A B CLEGG , M COLOMBO , J A COUGLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , J CVACH , S DAGORET , J B DAINTON , M DANILOV , WD DAU A W E DANN , M DAVID , E DEFFUR , B DELCOURT , I DELBUONO , M DEVEL , A DEROECK , P DINEZZA , P DINGUS , C DOLLFUS , J D DOWELL , H B DREIS , A DRESCHER , J DUBOC , D DULLMANN , O DUNGER , H DUHM , R EBBINGHAUS , M EBERLE , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , N N ELLIS , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , I F FENSOME , J FERENCEI , F FERRAROTTO , K FLAMM , W FLAUGER , M FLEISCHER , M FLEISER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , P FUHRMANN , E GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , M GENNIS , H GENZEL , R GERHARDS , L K GODFREY , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , H GREIF , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , J HARJES , R HAYDAR , W J HAYNES , J HEATHERINGTON , V HEDBERG , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , J HERYNEK , W HILDESHEIM , P HILL , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , P HUET , H HUFNAGEL , N HUOT , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , S KAZARIAN , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , R LANGKAU , P LANIUS , J F LAPORTE , A LEBEDEV , A LEUSCHNER , C LEVERENZ , S LEVONIAN , C LEY D LEWIN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , P LOCH , H LOHMANDER , G C LOPEZ , D LUERS , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , A MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , E MONNIER , F MOREAU , J MOREELS , J V MORRIS , K MULLER , P MURIN , S A MURRAY , V NAGOVIZIN , B NAROSA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , C NEIBUHR , R NISIUS , G NOWAK , G W NOYES , M NYBERG , H OBERLACK , U OBROCK , J E OLSSON , S ORENSTEIN , F OULDSAADA , C PASCAUD , G D PATEL , E PEPPEL , S PETERS , H T PHILLIPS , J P PHILLIPS , C PICHLER , W PILGRAM , D PITZL , S PRELL , R PROSI , G RADEL , F RAUPACH , K RAUSCHNABEL , P REIMER , S REINSHAGEN , P RIBARICS , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , S M ROBERTSON , P ROBMANN , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , C ROYON , M RUDOWICZ , M RUFFER , S RUSAKOV , K RYBICKI , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , W SCHMITZ , A SCHONING , V SCHRODER , E SCHUHMANN , M SCHULZ , B SCHWAB , A SCHWIND , W SCOBEL , U SEEHAUSEN , R SELL , A SEMENOV , V SHEKELYAHN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , Y SOLOVIEV , H SPITZER , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , I TICHOMIROV , P TRUOL , J TURNAU , J TUTAS , L URBAN , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , R VICK , G VILLET , E VOGEL , K WACKER , I W WALKER , A WALTHER , G WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , T WOLFF , L A WOMERSLEY , A E WRIGHT , N WULFF , T P YIOU , J ZACEK , C ZEITNITZ , H ZIAEEPOUR , M ZIMMER , W ZIMMERMANN , F ZOMER (1994) INCLUSIVE CHARGED-PARTICLE CROSS-SECTIONS IN PHOTOPRODUCTION AT HERA PHYSICS LETTERS B 328: 1-2. 176-186 MAY 26 Abstract: Cross sections are presented for the inclusive production of charged particles measured in electron-proton collisions at low Q2 with the H1 detector at HERA. The transverse momentum distribution extends up to 8 GeV/c. Its shape is found to be harder than that observed in ppBAR collisions at comparable centre-of-mass energies square-root s(gammap) almost-equal-to square-root s(ppBAR) almost-equal-to 200 GeV, and also harder than in gammap collisions at lower energies square-root s(gammap) almost-equal-to 18 GeV. Results from quantum chromodynamics (QCD) calculations agree with the measured transverse momentum and pseudorapidity cross sections.
Notes:
I ABT , T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN H BARWOLFF , P BARANOV , E BARRELET , W BARTEL , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , P BIDDULPH , E BINDER , A BISCHOFF , J C BIZOT , V BLOBEL , K BORRAS , P C BOSETTI , V BOUDRY , C BOURDARIOS , F BRASSE , U BRAUN , W BRAUNSCHWEIG , D BRUNCKO , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , M COLOMBO , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , J CVACH , S DAGORET , J B DAINTON , M DANILOV , WD DAU A W E DANN , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , M DEVEL , A DEROECK , P DINGUS , C DOLLFUS , J D DOWELL , H B DREIS , A DRESCHER , J DUBOC , D DULLMANN , O DUNGER , H DUHM , R EBBINGHAUS , M EBERLE , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , N N ELLIS , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , I F FENSOME , J FERENCEI , F FERRAROTTO , K FLAMM , W FLAUGER , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , P FUHRMANN , E GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , A GELLRICH , M GENNIS , H GENZEL , R GERHARDS , L GODFREY , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , H GREIF , G GRINDHAMMER , C GRUBER , J HAACK , L HAJDUK , O HAMON , D HANDSCHUH , E M HANLON , M HAPKE , J HARJES , R HAYDAR , W J HAYNES , J HEATHERINGTON , V HEDBERG , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , W HILDESHEIM , P HILL , C D HILTON , J HLADKY , K C HOEGER , P HUET , H HUFNAGEL , N HUOT , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , S KASARIAN , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , R LANGKAU , P LANIUS , J F LAPORTE , A LEBEDEV , A LEUSCHNER , C LEVERENZ , S LEVONIAN , C LEY D LEWIN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , P LOCH , H LOHMANDER , G C LOPEZ , D LUERS , N MAGNUSSEN , E MALINOVSKI , S MANI , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , A MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , V MILONE , E MONNIER , F MOREAU , J MOREELS , J V MORRIS , K MULLER , P MURIN , S A MURRAY , V NAGOVIZIN , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , C NIEBUHR , R NISIUS , G NOWAK , G W NOYES , M NYBERG , H OBERLACK , U OBROCK , J E OLSSON , S ORENSTEIN , F OULDSAADA , C PASCAUD , G D PATEL , E PEPPEL , S PETERS , H T PHILLIPS , J P PHILLIPS , C PICHLER , W PILGRAM , D PITZL , S PRELL , R PROSI , G RADEL , F RAUPACH , K RAUSCHNABEL , P REIMER , S REINSHAGEN , P RIBARICS , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , S M ROBERTSON , P ROBMANN , R ROOSEN , A ROSTOVTSEV , C ROYON , M RUDOWICZ , M RUFFER , S RUSAKOV , K RYBICKI , N SAHLMANN , E SANCHES , D P C SANKEY , M SAVITSKY , P SCHACHT , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , W SCHMITZ , A SCHONING , V SCHRODER , M SCHULZ , B SCHWAB , A SCHWIND , W SCOBEL , U SEEHAUSEN , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , L SMOLIK , Y SOLOVIEV , H SPITZER , P STAROBA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , I TICHOMIROV , P TRUOL , J TURNAU , J TUTAS , L URBAN , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , R VICK , G VILLET , E VOGEL , K WACKER , I W WALKER , A WALTHER , G WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , T WOLFF , L A WOMERSLEY , A E WRIGHT , N WULFF , T P YIOU , J ZACEK , P ZAVADA , C ZEITNITZ , H ZIAEEPOUR , M ZIMMER , W ZIMMERMANN , F ZOMER (1994) SCALING VIOLATIONS OF THE PROTON STRUCTURE-FUNCTION F2 AT SMALL X PHYSICS LETTERS B 321: 1-2. 161-167 JAN 20 Abstract: An analysis is presented of scaling violations of the proton structure function F-2(x, Q(2)) measured with the Hl detector at HERA in the range of Bjorken x values between x = 3 x 10(-4) and 10(-2) for four-momentum transfers Q(2) larger than 8.7 GeV2. The structure function F-2 (X, Q(2)) is observed to rise linearly with In Q(2). Under the assumption that the observed scaling violations at small x less than or equal to 0.01 are described correctly by perturbative QCD, an estimate is obtained of the gluon distribution function G(x, Q(o)(2)) at Q(o)(2) = 20 GeV2
Notes:
I ABT , T AHMED , S AID V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN H BARWOLFF , P BARANOV , E BARRELET , W BARTEL , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , P BIDDULPH , E BINDER , J C BIZOT , V BLOBEL , K BORRAS , P C BOSETTI , V BOUDRY , C BOURDARIOS , A BRAEMER , F BRASSE , U BRAUN , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , J CHYLA , D CLARKE , A B CLEGG , M COLOMBO , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , J CVACH , S DAGORET , J B DAINTON , M DANILOV , WD DAU A W E DANN , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , M DEVEL , A DEROECK , P DINEZZA , P DINGUS , C DOLLFUS , J D DOWELL , H B DREIS , A DRESCHER , J DUBOC , D DULLMANN , O DUNGER , H DUHM , R EBBINGHAUS , M EBERLE , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , N N ELLIS , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , I F FENSOME , J FERENCEI , F FERRAROTTO , K FLAMM , W FLAUGER , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , P FUHRMANN , E GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , M GENNIS , H GENZEL , R GERHARDS , L GODFREY , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , H GREIF , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , J HARJES , R HAYDAR , W J HAYNES , J HEATHERINGTON , V HEDBERG , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , W HILDESHEIM , P HILL , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , P HUET , H HUFNAGEL , N HUOT , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , S KAZARIAN , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , D KRUCKER , U KRUGER , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , R LANGKAU , P LANIUS , J F LAPORTE , A LEBEDEV , A LEUSCHNER , C LEVERENZ , S LEVONIAN , C LEY D LEWIN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , P LOCH , H LOHMANDER , G C LOPEZ , D LUERS , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , A MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , E MONNIER , F MOREAU , J MOREELS , J V MORRIS , K MULLER , P MURIN , S A MURRAY , V NAGOVIZIN , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , C NIEBUHR , R NISIUS , G NOWAK , G W NOYES , M NYBERG , H OBERLACK , U OBROCK , J E OLSSON , S ORENSTEIN , F OULDSAADA , C PASCAUD , G D PATEL , E PEPPEL , S PETERS , H T PHILLIPS , J P PHILLIPS , C PICHLER , W PILGRAM , D PITZL , S PRELL , R PROSI , G RADEL , F RAUPACH , K RAUSCHNABEL , P REIMER , S REINSHAGEN , P RIBARICS , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , S M ROBERTSON , P ROBMANN , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , C ROYON , M RUDOWICZ , M RUFFER , S RUSAKOV , K RYBICKI , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , W SCHMITZ , A SCHONING , V SCHRODER , E SCHUHMANN , M SCHULZ , B SCHWAB , A SCHWIND , W SCOBEL , U SEEHAUSEN , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , Y SOLOVIEV , H SPITZER , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , I TICHOMIROV , P TRUOL , J TURNAU , J TUTAS , L URBAN , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , A VARTAPETIAN , Y VAZDIK , M VECKO , R VKC P VERRECCHIA , G VILLET , E VOGEL , K WACKER , I W WALKER , A WALTHER , G WEBER , D WEGENER , A WEGENER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , T WOLFF , L A WOMERSLEY , A E WRIGHT , N WULFF , T P YIOU , J ZACEK , C ZEITNITZ , H ZIAEEPOUR , M ZIMMER , W ZIMMERMANN , F ZOMER (1994) ENERGY-FLOW AND CHARGED-PARTICLE SPECTRA IN DEEP-INELASTIC SCATTERING AT HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 63: 3. 377-389 AUG Abstract: Global properties of the hadronic final state in deep inelastic scattering events at HERA are investigated. The data are corrected for detector effects and are compared directly with QCD phenomenology. Energy flows in both the laboratory frame and the hadronic centre of mass system and energy-energy correlations in the laboratory frame are presented. Comparing various QCD models, the colour dipole model provides the only satisfactory description of the data. In the hadronic centre of mass system the momentum components of charged particles longitudinal and transverse to the virtual boson direction are measured and compared with lower energy lepton-nucleon scattering data as well as with e+ e- dat from LEP.
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T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , J BAN A BABAEV , P BARANOV , E BARRELET , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , P BIDDULPH , J C BIZOT , V BLOBEL , K BORRAS , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , M COLOMBO , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , J B DAINTON , M DANILOV , WD DAU A W E DANN , K DAUM , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , A DEROECK , E DEWOLF , C DOLLFUS , J D DOWELL , H B DREIS , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , W FLAUGER , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , W J HAYNES , J HEATHERINGTON , V HEDBERG , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , W HILDESHEIM , P HILL , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , P HUET , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , S KAZARIAN , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , M KRUNERMARQUIS , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , P LOCH , H LOHMANDER , G C LOPEZ , D LUERS , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , P MARAGE , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , A MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , V MILONE , D MILSTEAD , F MOREAU , J V MORRIS , G MULLER , K MULLER , P MURI , V NAGOVIZIN , B NAROSKA , T NAUMANN , G NAWRATH , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , C NIEBUHR , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , H OBERLACK , U OBROCK , J E OLSSON , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , D PITZL , G POPE , S PRELL , R PROSI , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , S M ROBERTSON , P ROBMANN , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , C ROYON , K RUTER , M RUFFER , S RUSAKOV , K RYBICKI , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , A SCHONING , V SCHRODER , M SCHULZ , B SCHWAB , A SCHWIND , U SEEHAUSEN , F SEFKOW , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , Y SOLOVIEV , H SPITZER , P STAROBA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , I TICHOMIROV , P TRUOL , J TURNAU , J TUTAS , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , I W WALKER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , T WOLFF , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , Z ZHANG , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER (1994) 1ST MEASUREMENT OF THE CHARGED CURRENT CROSS-SECTION AT HERA PHYSICS LETTERS B 324: 2. 241-248 MAR 31 Abstract: The cross section of the charged current process e-p --> nu(e) + hadrons is measured at HERA for transverse momenta of the hadron system larger than 25 GeV The size of the cross section exhibits the W propagator.
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J BAN B ANDRIEU , E BARRELET , G BERNARDI , M BESANCON , E BINDER , H BLUME , K BORRAS , V BOUDRY , V BRISSON , A CAMPBELL , T CARLI , M COLOMBO , C COUTURES , G COZZIKA , J CVACH , M DAVID , L DELBUONO , B DELCOURT , M DEVEL , P DINGUS , A DRESCHER , J DUBOC , R EBBINGHAUS , S EGLI , J FELTESSE , Z Y FENG , W FLAUGER , M FLEISER , K GAMERDINGER , J GAYLER , L GOERLICH , M GOLDBERG , R GRASSLER , H GREIF , M HAGUENAUER , L HAJDUK , O HAMON , P HARTZ , R HAYDAR , W HILDESHEIM , N HUOT , M A JABIOL , A JACHOLKOWSKA , M JAFFRE , H JUNG , C KIESLING , H KOLANOSKI , V KORBEL , M KORN , W KRASNY , J P KUBENKA , J KURZHOFER , H KUSTER , J F LAPORTE , U LENHARDT , P LOCH , D LUERS , J MARKS , J MARTYNIAK , T MERZ , H K NGUYEN , H OBERLACK , U OBROCK , C PASCAUD , S PETERS , K RAUSCHNABEL , P RIBARICS , M RIETZ , M RUDOWICZ , V RUSINOV , N SAHLMANN , E SANCHEZ , P SCHACHT , V SHEKELYAN , Y SIROIS , P STAROBA , H STEINER , U STRAUMANN , J TURNAU , L URBAN , C VALLEE , M VECKO , P VERRECCHIA , G VILLET , D WEGENER , H P WELLISCH , T P YIOU , J ZACEK , C ZEITNITZ (1994) ELECTRON PION SEPARATION WITH THE H1 LAR CALORIMETERS NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 344: 3. 492-506 MAY 15 Abstract: The performances of the Hl liquid argon calorimeter modules for the energy measurements and identification of electons are studied with test data taken at CERN in the energy range 5 to 166 GeV. Various electron identification estimators exploiting global or detailed shower characteristics are studied and compared. The usage of impact position measurements is also discussed. A best combination of robust shower estimators leads typically to pi-misidentification probabilities in the range 1.5 to 5.0 x 10(-3) at 30 GeV for 95% electron detection efficiency. This further reduces to approximately 10(-4) for these pions to be misidentified as electrons below 25 GeV.
Notes:
J BAN B ANDRIEU , E BARRELET , G BERNARDI , M BESANCON , E BINDER , H BLUME , K BORRAS , V BOUDRY , F BRASSE , V BRISSON , A J CAMPBELL , T CARLI , M COLOMBO , C COUTURES , G COZZIKA , M DAVID , L DELBUONO , B DELCOURT , M DEVEL , P DINGUS , A DRESCHER , J DUBOC , R EBBINGHAUS , S EGLI , J FELTESSE , Y FENG , W FLAUGER , M FLIESER , K GAMERDINGER , J GAYLER , L GOERLICH , M GOLDBERG , R GRASSLER , H GREIF , M HAGUENAUER , L HAJDUK , O HAMON , P HARTZ , R HAYDAR , W HILDESHEIM , N HUOT , M A JABIOL , A JACHOLKOWSKA , M JAFFRE , H JUNG , C KIESLING , T KIRCHHOFF , H KOLANOSKI , V KORBEL , M KORN , W KRASNY , J P KUBENKA , H KUSTR , J KURZHOFER , J F LAPORTE , U LENHARDT , P LOCH , D LUERS , J MARKS , J MARTYNIAK , A NAU T MERZ , H K NGUYEN , H OBERLACH , U OBROCK , C PASCAUD , HB PYO S PETERS , K RAUSCHNABEL , P RIBARICS , M RIETZ , V RUSINOV , N SAHLMANN , E SANCHEZ , P SCHACHT , V SHEKELYAN , Y SIROIS , P STAROBA , H STEINER , U STRAUMANN , J TURNAU , L URBAN , C VALLEE , M VECKO , P VERRECHIA , VILLET , D WEGENER , H P WELLISCH , T P YIOU , J ZACEK , C ZEITNITZ , F ZOMER (1994) BEAM TESTS AND CALIBRATION OF THE H1 LIQUID ARGON CALORIMETER WITH ELECTRONS NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 350: 1-2. 57-72 OCT 15 Abstract: Results are presented on the energy calibration of the H1 liquid argon calorimeter modules with electrons from a test beam in the energy range of 3.7 GeV to 80 GeV. The method to determine the calibration for the H1 experiment from these measurements by the use of detailed simulations is described. Various systematic checks of this calibration are given. The calorimeter response is uniform in space within +/- 1% and linear with energy within +/- 1%. An average energy resolution of about 11.5%/square-rootE[GeV] is achieved.
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S AID T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAEHR , P BARANOV , E BARRELET , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , M COLOMBO , J G CONTRERAS , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , J B DAINTON , WD DAU M DANILOV , K DAUM , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FEIST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , W J HAYNES , J HEATHERINGTON , V HEDBERG , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , P HUET , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWIRT , W KO G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , B LIST , P LOCH , H LOHMANDER , G C LOPEZ , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , C NIEBUHR , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , H OBERLACK , U OBROCK , J E OLSSON , E PANARO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , D PITZL , G POPE , S PRELL , R PROSI , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , S SCHIEK , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , A SCHWIND , U SEEHAUSEN , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , Y SOLOVIEV , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , I TICHOMIROV , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , I W WALKER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , M ZIMMER , W ZIMMERMAN , F ZOMER , K ZUBER (1994) A SEARCH FOR LEPTOQUARKS AND SQUARKS AT HERA ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 64: 4. 545-558 DEC Abstract: A search in the H1 experiment at HERA for scalar and vector leptoquarks, leptogluons and squarks coupling to first generation fermions is presented in a data sample corresponding to an integrated luminosity of 425 nb(-1). For masses ranging up to similar to 275 GeV, no significant evidence for the direct production of such particles is found in various possible decay channels. At high masses and beyond the centre of mass energy of 296 GeV a contact interaction analysis is used to further constrain the couplings and masses of new vector leptoquarks and to set lower limits on compositeness scales.
Notes:
S AID T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAEHR , P BARANOV , E BARRELET , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , P BIDDULPH , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , M COLOMBO , J G CONTRERAS , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , J B DAINTON , WD DAU M DANILOV , K DAUM , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , W J HAYNES , J HEATHERINGTON , V HEDBERG , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , P HUET , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , B LIST , P LOCH , H LOHMANDER , G C LOPEZ , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , C NIEBUHR , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , H OBERLACK , U OBROCK , J E OLSSON , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , D PITZL , G POPE , S PRELL , R PROSI , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , S SCHIEK , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , A SCHWIND , U SEEHAUSEN , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , Y SOLOVIEV , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , I TICHOMIROV , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , I W WALKER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , T WOLFF , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , Z ZHANG , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER (1994) A SEARCH FOR HEAVY-LEPTONS AT HERA PHYSICS LETTERS B 340: 3. 205-216 DEC 8 Abstract: A search for direct production of new leptons in the mass range from 10 GeV up to 225 GeV is presented by the H1 experiment at HERA. The data were obtained during 1993 and correspond to an integrated luminosity of 528 nb-1. The search includes heavy lepton decays to final states e (nu) gamma and e (nu) W, e (nu) Z with the subsequent decay of the W and Z bosons into jets or lepton pairs. No evidence was found for the production of new massive electrons or neutrinos in any of the decay channels. Rejection limits for excited electrons and neutrinos are derived.
Notes:
S AID T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAEHR , P BARANOV , E BARRELET , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , R BEYER , P BIDDULPH , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , M COLOMBO , J G CONTRERAS , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , J B DAINTON , WD DAU M DANILOV , K DAUM , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , W ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , R D GOLDNE , B GONZALEZPINEIRO , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , W J HAYNES , J HEATERINGTON , V HEDBERG , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , P HUET , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , B LIST , P LOCH , H LOHMANDER , G C LOPEZ , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , C NIEBUHR , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , H OBERLACK , U OBROCK , J E OLSSON , E PANARO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , D PITZL , G POPE , S PRELL , R PROSI , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , S SCHIEK , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , A SCHWIND , U SEEHAUSEN , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , Y SOLOVIEV , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , I TICHOMIROV , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , M WAGENER , I W WALKER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , D ZARBOCK , Z ZHANG , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER (1994) PHOTOPRODUCTION OF J/PSI MESONS AT HERA PHYSICS LETTERS B 338: 4. 507-518 NOV 3 Abstract: We present a study of J/psi meson production in collisions of 26.7 GeV electrons with 820 GeV protons, performed with the H1-detector at the HERA collider at DESY. The J/psi mesons are detected via their leptonic decays both to electrons and muons. Requiring exactly two particles in the detector, a cross section of sigma(ep --> J/psiX) = (8.8 +/- 2.2) nb is determined for 30 GeV less-than-or-equal-to W(gammap) less-than-or-equal-to 180 GeV and Q2 less-than-or-similar-to 4 GeV2. Using the flux of quasi-real photons with Q2 less-than-or-similar-to 4 GeV2, a total photoproduction cross section of sigma(gammap --> J/psiX) = (56 +/- 13 +/- 14) nb is derived at an average W(gammap) = 90 GeV. The distribution of the squared momentum transfer t from the proton to the J/psi can be fitted using an exponential exp (-b\t\) elow a \t\ of 0.75 GeV2 yielding a slope parameter of b = (4.7 +/- 1.9) GeV-2.
Notes:
S AID T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN J BAEHR , P BARANOV , E BARRELET , W BARTEL , M BARTH , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , P BIDDULPH , J C BIZOT , V BLOBEL , K BORRAS , F BOTTERWECK , V BOUDRY , A BRAEMER , F BRASSE , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , C BRUNE , R BUCHHOLZ , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , B CLERBAUX , M COLOMBO , J G CONTRERAS , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , D G CUSSANS , J CVACH , S DAGORET , J B DAINTON , WD DAU M DANILOV , K DAUM , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , A DEROECK , E A DEWOLF , P DINEZZA , C DOLLFUS , J D DOWELL , H B DREIS , J DUBOC , D DULLMANN , O DUNGER , H DUHM , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , H EHRLICHMANN , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , J FERENCEI , F FERRAROTTO , K FLAMM , M FLEISCHER , M FLIESER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , E GABATHULER , K GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , M GEBAUER , A GELLRICH , H GENZEL , R GERHARDS , U GOERLACH , L GOERLICH , N GOGITIDZE , M GOLDBERG , D GOLDNER , B GONZALEZPINEIRO , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , G GRINDHAMMER , A GRUBER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , M HAMPEL , E M HANLON , M HAPKE , W J HAYNES , J HEATHERINGTON , V HEDBERG , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , M F HESS , W HILDESHEIM , P HILL , K H HILLER , C D HILTON , J HLADKY , K C HOEGER , M HOPPNER , R HORISBERGER , P HUET , H HUFNAGEL , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , J JANOTH , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , D KANT , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , S KAZARIAN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , U KRUNERMARQUIS , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , D LACOUR , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , P LANIUS , J F LAPORTE , A LEBEDEV , C LEVERENZ , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , B LIST , P LOCH , H LOHMANDER , G C LOPEZ , D LUKE , N MAGNUSSEN , E MALINOVSKI , S MANI , R MARACEK , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASON , T MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , D MILSTEAD , F MOREAU , J V MORRIS , G MULLER , K MULLER , P MURIN , V NAGOVIZIN , R NAHNHAUER , B NAROSKA , T NAUMANN , P R NEWMAN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , C NIEBUHR , R NISIUS , G NOWAK , G W NOYES , M NYBERGWERTHER , H OBERLACK , U OBROCK , J E OLSSON , E PANARO , A PANITCH , C PASCAUD , G D PATEL , E PEPPEL , E PEREZ , J P PHILLIPS , C PICHLER , D PITZL , G POPE , S PRELL , R PROSI , G RADEL , F RAUPACH , P REIMER , S REINSHAGEN , P RIBARICS , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , S M ROBERTSON , P ROBMANN , H E ROLOFF , R ROOSEN , K ROSENBAUER , A ROSTOVTSEV , F ROUSE , C ROYON , K RUTER , S RUSAKOV , K RYBICKI , R RYLKO , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , S SCHIEK , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , G SCHMIDT , A SCHONING , V SCHRODER , E SCHUHMANN , B SCHWAB , A SCHWIND , U SEEHAUSEN , F SEFKOW , M SEIDEL , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , Y SOLOVIEV , H SPITZER , R STAROSTA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , J STIEWE , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , S TAPPROGGE , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , I TICHOMIROV , P TRUOL , J TURNAU , J TUTAS , P UELKES , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , P VANMECHELEN , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , G VILLET , K WACKER , A WAGENER , I W WALKER , A WALTHER , G WEBER , M WEBER , D WEGENER , A WEGNER , H P WELLISCH , L R WEST , S WILLARD , M WINDE , G G WINTER , T WOLFF , A E WRIGHT , E WUNSCH , N WULFF , T P YIOU , J ZACEK , Z ZHANG , M ZIMMER , W ZIMMERMANN , F ZOMER , K ZUBER (1994) DEEP-INELASTIC SCATTERING EVENTS WITH A LARGE RAPIDITY GAP AT HERA NUCLEAR PHYSICS B 429: 3. 477-502 NOV 7 Abstract: Evidence is presented using data taken with the H1 detector at HERA for a class of deep inelastic electron-proton scattering (DIS) events (5 < Q(2) < 120GeV(2)) at low Bjorken-x (10(-4) < x < 10(-2)) which have almost no hadronic energy flow in a large interval of pseudo-rapidity around the proton remnant direction and which cannot be attributed to our present understanding of DIS and fluctuations in final state hadronic fragmentation. From an integrated luminosity of 273 nb(-1) 734 events, that is about 5% of the total DIS sample, have no energy deposition greater than 400 MeV forward of laboratory pseudo-rapidity eta(max) = 1.8 up to the largest measurable pseudorapidity of about 3.65. Evidence that about 10% of observed rapidity gap events are exclusive vector meson electroproduction is presented. Good descriptions of the data are obtained using models based either on a vector meson dominance like picture, which includes a large fraction of inelastic virtual photon dissociation, or on deep inelastic electron-pomeron scattering in which the partonic sub-structure of the latter is resolved.
Notes:
1993
T AHMED , V ANDREEV , B ANDRIEU , M ARPAGAUS , A BABAEV , J BAN H BARWOLFF , P BARANOV , E BARRELET , W BARTEL , U BASSLER , G A BECK , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , U BERTHON , G BERTRANDCOREMANS , M BESANCON , P BIDDULPH , E BINDER , J C BIZOT , V BLOBEL , K BORRAS , P C BOSETTI , V BOUDRY , C BOURDARIOS , F BRASSE , U BRAUN , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , M COLOMBO , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , J CVACH , J B DAINTON , M DANILOV , WD DAU A W E DANN , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , M DEVEL , A DEROECK , P DINGUS , C DOLLFUS , J D DOWELL , H B DREIS , A DRESCHER , J DUBOC , D DULLMANN , O DUNGER , H DUHM , M EBERLE , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , N N ELLIS , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , Y FENG , I F FENSOME , J FERENCEI , F FERRAROTTO , W FLAUGER , M FLEISCHER , P S FLOWER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , P FUHRMANN , E GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , A GELLRICH , M GENNIS , U GENSCH , H GENZEL , R GERHARDS , D GILLESPIE , L GODFREY , U GOERLACH , L GOERLICH , M GOLDBERG , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , H GREIF , G GRINDHAMMER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , D HANDSCHUH , E M HANLON , M HAPKE , J HARJES , P HARTZ , R HAYDAR , W J HAYNES , J HEATHERINGTON , V HEDBERG , R HEDGECOCK , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , W HILDESHEIM , P HILL , C D HILTON , J HLADKY , K C HOEGER , P HUET , H HUFNAGEL , N HUOT , M IBBOTSON , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , S KASARIAN , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , I R KENYON , S KERMICHE , C KIESLING , M KLEIN , C KLEINWORT , G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , R LANDER , M P J LANDON , R LANGKAU , P LANIUS , J F LAPORTE , A LEBEDEV , A LEUSCHNER , C LEVERENZ , D LEVIN , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , P LOCH , H LOHMANDER , G C LOPEZ , D LUERS , N MAGNUSSEN , E MALINOVSKI , S MANI , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , A MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , V MILONE , E MONNIER , F MOREAU , J MOREELS , J V MORRIS , J M MORTON , K MULLER , P MURIN , S A MURRAY , V NAGOVIZIN , B NAROSKA , T NAUMANN , D NEWTON , H K NGUYEN , F NIEBERGALL , R NISIUS , G NOWAK , G W NOYES , M NYBERG , H OBERLACK , U OBROCK , J E OLSSON , S ORENSTEIN , F OULDSAADA , C PASCAUD , G D PATEL , E PEPPEL , S PETERS , H T PHILLIPS , J P PHILLIPS , C PICHLER , W PILGRAM , D PITZL , R PROSI , F RAUPACH , K RAUSCHNABEL , P REIMER , P RIBARICS , V RIECH , J RIEDLBERGER , M RIETZ , S M ROBERTSON , P ROBMANN , R ROOSEN , A ROSTOVTSEV , C ROYON , M RUDOWICZ , M RUFFER , S RUSAKOV , K RYBICKI , E RYSECK , J SACTON , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , W SCHMITZ , V SCHRODER , M SCHULZ , A SCHWIND , W SCOBEL , U SEEHAUSEN , R SELL , M SEMAN , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , L SMOLIK , Y SOLOVIEV , H SPITZER , P STAROBA , M STEENBOCK , P STEFFEN , R STEINBERG , H STEINER , B STELLA , K STEPHENS , J STIER , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , R E TAYLOR , G THOMPSON , R J THOMPSON , I TICHOMIROV , C TRENKEL , P TRUOL , V TCHERNYSHOV , J TURNAU , J TUTAS , L URBAN , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , R VICK , G VILLET , E VOGEL , K WACKER , I W WALKER , A WALTHER , G WEBER , D WEGENER , A WEGNER , H P WELLISCH , S WILLARD , M WINDE , G G WINTER , T WOLFF , L A WOMERSLEY , A E WRIGHT , N WULFF , T P YIOU , J ZACEK , P ZAVADA , C ZEITNITZ , H ZIAEEPOUR , M ZIMMER , W ZIMMERMANN , F ZOMER (1993) OBSERVATION OF DEEP INELASTIC-SCATTERING AT LOW-X PHYSICS LETTERS B 299: 3-4. 385-393 JAN 28 Abstract: Measurements of the scattered electron energy spectrum and the differential cross sections dsigma/d log(x) and dsigma/dQ2 for inclusive neutral current deep inelastic electron-proton scattering are presented. The data were obtained with the H1 detector at HERA during its first running period in which 26.7 GeV electrons collided with 820 GeV protons. The data correspond to an integrated luminosity of 1.3 nb-1 and allow the first studies of the structure of the proton at values of x down to 10(-4) for Q2 > 5 GeV2.
Notes:
T AHMED , V ANDREEV , B ANDRIEU , M ARPAGAUS , A BABAEV , J BAN H BARWOLFF , P BARANOV , E BARRELET , W BARTEL , U BASSLER , G A BECK , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , U BERTHON , G BERTRANDCOREMANS , M BESANCON , P BIDDULPH , E BINDER , J C BIZOT , V BLOBEL , K BORRAS , P C BOSETTI , V BOUDRY , C BOURDARIOS , F BRASSE , U BRAUN , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , M COLOMBO , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGGE , J CVACH , J B DAINTON , M DANILOV , WD DAU A W E DANN , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , M DEVEL , A DEROECK , P DINGUS , C DOLLFUS , J D DOWELL , H B DREIS , A DRESCHER , J DUBOC , D DULLMANN , O DUNGER , H DUHM , M EBERLE , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , N N ELLIS , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , Y FENG , I F FENSOME , J FERENCEI , F FERRAROTTO , W FLAUGER , M FLEISCHER , P S FLOWER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , P FUHRMANN , E GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , A GELLRICH , M GENNIS , U GENSCH , H GENZEL , R GERHARDS , D GILLESPIE , L GODFREY , U GOERLACH , L GOERLICH , M GOLDBERG , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , H GREIF , G GRINDHAMMER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , D HANDSCHUH , E M HANLON , M HAPKE , J HARJES , P HARTZ , R HAYDAR , W J HAYNES , J HEATHERINGTON , V HEDBERG , R HEDGECOCK , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , W HILDESHEIM , P HILL , C D HILTON , J HLADKY , K C HOEGER , P HUET , H HUFNAGEL , N HUOT , M IBBOTSON , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , S KASARIAN , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , I R KENYON , S KERMICHE , C KIESLING , M KLEIN , C KLEINWORT , G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , R LANDER , M P J LANDON , R LANGKAU , P LANIUS , J F LAPORTE , A LEBEDEV , A LEUSCHNER , C LEVERENZ , D LEVIN , C LEY S LEVONIAN , A LINDNER , G LINDSTROM , P LOCH , H LOHMANDER , G C LOPEZ , D LUERS , N MAGNUSSEN , E MALINOVSKI , S MANI , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , A MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , V MILONE , E MONNIER , F MOREAU , J MOREELS , J V MORRIS , J M MORTON , K MULLER , P MURIN , S A MURRAY , V NAGOVIZIN , B NAROSKA , T NAUMANN , D NEWTON , H K NGUYEN , F NIEBERGALL , R NISIUS , G NOWAK , G W NOYES , M NYBERG , H OBERLACK , U OBROCK , J E OLSSON , S ORENSTEIN , F OULDSAADA , C PASCAUD , G D PATEL , E PEPPEL , S PETERS , H T PHILLIPS , J P PHILLIPS , C PICHLER , W PILGRAM , D PITZL , R PROSI , F RAUPACH , K RAUSCHNABEL , P REIMER , P RIBARICS , V RIECH , J RIEDLBERGER , M RIETZ , S M ROBERTSON , P ROBMANN , R ROOSEN , A ROSTOVTSEV , C ROYON , M RUDOWICZ , M RUFFER , S RUSAKOV , K RYBICKI , E RYSECK , J SACTON , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , W SCHMITZ , V SCHRODER , M SCHULZ , A SCHWIND , W SCOBEL , U SEEHAUSEN , R SELL , M SEMAN , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , L SMOLIK , Y SOLOVIEV , H SPITZER , P STAROBA , M STEENBOCK , P STEFFEN , R STEINBERG , H STEINER , B STELLA , K STEPHENS , J STIER , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , R E TAYLOR , G THOMPSON , R J THOMPSON , I TICHOMIROV , C TRENKEL , P TRUOL , V TCHERNYSHOV , J TURNAU , J TUTAS , L URBAN , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , R VICK , G VILLET , E VOGEL , K WACKER , I W WALKER , A WALTHER , G WEBER , D WEGENER , A WEGNER , H P WELLISCH , S WILLARD , M WINDE , G G WINTER , T WOLFF , L A WOMERSLEY , A E WRIGHT , N WULFF , T P YIOU , J ZACEK , P ZAVADA , C ZEITNITZ , H ZIAEEPOUR , M ZIMMER , W ZIMMERMANN , F ZOMER (1993) MEASUREMENT OF THE HADRONIC FINAL-STATE IN DEEP INELASTIC-SCATTERING AT HERA PHYSICS LETTERS B 298: 3-4. 469-478 JAN 14 Abstract: We report on the first experimental study of the hadronic final state in deep inelastic electron-proton scattering with the H1 detector at HERA. Energy flow and transverse momentum characteristics are measured and presented both in the laboratory and in the hadronic center of mass frames. Comparison is made with QCD models distinguished by their different treatment of parton emission.
Notes:
I ABT , T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN H BARWOLFF , P BARANOV , E BARRELET , W BARTEL , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , P BIDDULPH , E BINDER , A BISCHOFF , J C BIZOT , V BLOBEL , K BORRAS , P C BOSETTI , V BOUDRY , C BOURDARIOS , F BRASSE , U BRAUN , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , M COLOMBO , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , J CVACH , S DAGORET , J B DAINTON , M DANILOV , WD DAU A W E DANN , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , M DEVEL , A DEROECK , P DINGUS , C DOLLFUS , J D DOWELL , H B DREIS , A DRESCHER , J DUBOC , D DULLMANN , O DUNGER , H DUHM , R EBBINGHAUS , M EBERLE , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , N N ELLIS , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , I F FENSOME , J FERENCEI , F FERRAROTTO , K FLAMM , W FLAUGER , M FLEISCHER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , P FUHRMANN , E GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , A GELLRICH , M GENNIS , H GENZEL , R GERHARDS , D GILLESPIE , L GODFREY , U GOERLACH , L GOERLICH , M GOLDBERG , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , H GREIF , G GRINDHAMMER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , D HANDSCHUH , E M HANLON , M HAPKE , J HARJES , R HAYDAR , W J HAYNES , J HEATHERINGTON , V HEDBERG , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , W HILDESHEIM , P HILL , C D HILTON , J HLADKY , K C HOEGER , P HUET , H HUFNAGEL , N HUOT , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , S KASARIAN , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , R LANDER , M P J LANDON , W LANGE , R LANGKAU , P LANIUS , J F LAPORTE , A LEBEDEV , A LEUSCHNER , C LEVERENZ , S LEVONIAN , C LEY D LEWIN , A LINDNER , G LINDSTROM , J LIPINSKI , P LOCH , H LOHMANDER , G C LOPEZ , D LUERS , N MAGNUSSEN , E MALINOVSKI , S MANI , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , A MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , V MILONE , E MONNIER , F MOREAU , J MOREELS , J V MORRIS , K MULLER , P MURIN , S A MURRAY , V NAGOVIZIN , B NAROSKA , T NAUMANN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , R NISIUS , G NOWAK , G W NOYES , M NYBERG , H OBERLACK , U OBROCK , J E OLSSON , S ORENSTEIN , F OULDSAADA , C PASCAUD , G D PATEL , E PEPPEL , S PETERS , J P PHARABOD , H T PHILLIPS , J P PHILLIPS , C PICHLER , W PILGRAM , D PITZL , R PROSI , G RADEL , F RAUPACH , K RAUSCHNABEL , P REIMER , P RIBARICS , V RIECH , J RIEDLBERGER , M RIETZ , S M ROBERTSON , P ROBMANN , R ROOSEN , A ROSTOVTSEV , C ROYON , M RUDOWICZ , M RUFFER , S RUSAKOV , K RYBICKI , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , W SCHMITZ , V SCHRODER , M SCHULZ , A SCHWIND , W SCOBEL , U SEEHAUSEN , R SELL , M SEMAN , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , L SMOLIK , Y SOLOVIEV , H SPITZER , P STAROBA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , R E TAYLOR , C THIEBAUX , G THOMPSON , I TICHOMIROV , C TRENKEL , P TRUOL , V TCHERNYSHOV , J TURNAU , J TUTAS , L URBAN , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , R VICK , G VILLET , E VOGEL , K WACKER , I W WALKER , A WALTHER , G WEBER , D WEGENER , A WEGNER , H P WELLISCH , S WILLARD , M WINDE , G G WINTER , T WOLFF , L A WOMERSLEY , A E WRIGHT , N WULFF , T P YIOU , J ZACEK , P ZAVADA , C ZEITNITZ , H ZIAEEPOUR , M ZIMMER , W ZIMMERMANN , F ZOMER (1993) A SEARCH FOR LEPTOQUARKS, LEPTOGLUONS AND EXCITED LEPTONS IN H1 AT HERA NUCLEAR PHYSICS B 396: 1. 3-23 MAY 10 Abstract: A direct search for new particles in the H1 experiment at HERA is presented for masses ranging from 35 GeV up to approximately 250 GeV. The data sample of 24 nb-1 accumulated during the first year of operation was analysed for signatures of scalar and vector leptoquarks, leptogluons, excited electrons and excited neutrinos with flavours of the first generation. No evidence for the production of such particles was found in various possible decay channels. Rejection limits are derived.
Notes:
T AHMED , V ANDREEV , B ANDRIEU , M ARPAGAUS , A BABAEV , J BAN H BARWOLFF , P BARANOV , E BARRELET , W BARTEL , U BASSLER , G A BECK , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , U BERTHON , G BERTRANDCOREMANS , M BESANCON , P BIDDULPH , E BINDER , J C BIZOT , V BLOBEL , K BORRAS , P C BOSETTI , V BOUDRY , C BOURDARIOS , F BRASSE , U BRAUN , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , M COLOMBO , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , J CVACH , J B DAINTON , M DANILOV , WD DAU A W E DANN , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , M DEVEL , A DEROECK , P DINGUS , C DOLLFUS , J D DOWELL , H B DREIS , A DRESCHER , J DUBOC , D DULLMANN , O DUNGER , H DUHM , M EBERLE , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , N N ELLIS , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , Y FENG , I F FENSOME , J FERENCEI , F FERRAROTTO , W FLAUGER , M FLEISCHER , P S FLOWER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , P FUHRMANN , E GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , A GELLRICH , M GENNIS , U GENSCH , H GENZEL , R GERHARDS , D GILLESPIE , L GODFREY , U GOERLACH , L GOERLICH , M GOLDBERG , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , H GREIF , G GRINDHAMMER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , D HANDSCHUH , E M HANLON , M HAPKE , J HARJES , P HARTZ , R HAYDAR , W J HAYNES , J HEATHERINGTON , V HEDBERG , R HEDGECOCK , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , W HILDESHEIM , P HILL , C D HILTON , J HLADKY , K C HOEGER , P HUET , H HUFNAGEL , N HUOT , M IBBOTSON , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , S KASARIAN , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , I R KENYON , S KERMICHE , C KIESLING , M KLEIN , C KLEINWORT , G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , R LANDER , M P J LANDON , R LANGKAU , P LANIUS , J F LAPORTE , A LEBEDEV , A LEUSCHNER , C LEVERENZ , D LEVIN , O LEY S LEVONIAN , A LINDNER , G LINDSTROM , P LOCH , H LOHMANDER , G C LOPEZ , D LUERS , N MAGNUSSEN , E MALINOVSKI , S MANI , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , A MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , V MILONE , E MONNIER , F MOREAU , J MOREELS , J V MORRIS , J M MORTON , K MULLER , P MURIN , S A MURRAY , V NAGOVIZIN , B NAROSKA , T NAUMANN , D NEWTON , H K NGUYEN , F NIEBERGALL , R NISIUS , G NOWAK , G W NOYES , M NYBERG , H OBERLACK , U OBROCK , J E OLSSON , S ORENSTEIN , F OULDSAADA , C PASCAUD , G D PATEL , E PEPPEL , S PETERS , H T PHILLIPS , J P PHILLIPS , C PICHLER , W PILGRAM , D PITZL , R PROSI , F RAUPACH , K RAUSCHNABEL , P REIMER , P RIBARICS , V RIECH , J RIEDLBERGER , M RIETZ , S M ROBERTSON , P ROBMANN , R ROOSEN , A ROSTOVTSEV , C ROYON , M RUDOWICZ , M RUFFER , S RUSAKOV , K RYBICKI , E RYSECK , J SACTON , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , W SCHMITZ , V SCHRODER , M SCHULZ , A SCHWIND , W SCOBEL , U SEEHAUSEN , R SELL , M SEMAN , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , L SMOLIK , Y SOLOVIEV , H SPITZER , P STAROBA , M STEENBOCK , P STEFFEN , R STEINBERG , H STEINER , B STELLA , K STEPHENS , J STIER , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , R E TAYLOR , G THOMPSON , R J THOMPSON , I TICHOMIROV , C TRENKEL , P TRUOL , V TCHERNYSHOV , J TURNAU , J TUTAS , L URBAN , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , R VICK , G VILLET , E VOGEL , K WACKER , I W WALKER , A WALTHER , G WEBER , D WEGENER , A WEGNER , H P WELLISCH , S WILLARD , M WINDE , G G WINTER , T WOLFF , L A WOMERSLEY , A E WRIGHT , N WULFF , T P YIOU , J ZACEK , P ZAVADA , C ZEITNITZ , H ZIAEEPOUR , M ZIMMER , W ZIMMERMANN , F ZOMER (1993) TOTAL PHOTOPRODUCTION CROSS-SECTION MEASUREMENT AT HERA ENERGIES PHYSICS LETTERS B 299: 3-4. 374-384 JAN 28 Abstract: We present first results on the total photoproduction cross section measurement with the H1 detector at HERA. The data were extracted from low Q2 collisions of 26.7 GeV electrons with 820 GeV protons. The gammap total cross section has been measured by two independent methods in the gammap center of mass energy range from 90 to 290 GeV. For an average center of mass energy of 195 GeV a value of sigma(tot) (gammap) = 159 +/- 7 (stat.) +/- 20 (syst.) mub was obtained.
Notes:
I ABT , T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN H BARWOLFF , P BARANOV , E BARRELET , W BARTEL , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , P BIDDULPH , E BINDER , A BISCHOFF , J C BIZOT , V BLOBEL , K BORRAS , P C BOSETTI , V BOUDRY , C BOURDARIOS , F BRASSE , U BRAUN , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , M COLOMBO , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , J CVACH , S DAGORET , J B DAINTON , M DANILOV , WD DAU A W E DANN , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , M DEVEL , A DEROECK , P DINGUS , C DOLLFUS , J D DOWELL , H B DREIS , A DRESCHER , J DUBOC , D DULLMANN , O DUNGER , H DUHM , R EBBINGHAUS , M EBERLE , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , N N ELLIS , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , I F FENSOME , J FERENCEI , F FERRAROTTO , K FLAMM , W FLAUGER , M FLEISCHER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , P FUHRMANN , E GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , A GELLRICH , M GENNIS , H GENZEL , R GERHARDS , L GODFREY , U GOERLACH , L GOERLICH , M GOLDBERG , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , H GREIF , G GRINDHAMMER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , D HANDSCHUH , E M HANLON , M HAPKE , J HARJES , R HAYDAR , W J HAYNES , J HEATHERINGTON , V HEDBERG , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , W HILDESHEIM , P HILL , C D HILTON , J HLADKY , K C HOEGER , P HUET , H HUFNAGEL , N HUOT , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , S KASARIAN , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , R LANGKAU , P LANIUS , J F LAPORTE , A LEBEDEV , A LEUSCHNER , C LEVERENZ , S LEVONIAN , C LEY D LEWIN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , P LOCH , H LOHMANDER , G C LOPEZ , D LUERS , N MAGNUSSEN , E MALINOVSKI , S MANI , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , A MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , V MILONE , E MONNIER , F MOREAU , J MOREELS , J V MORRIS , K MULLER , P MURIN , S A MURRAY , V NAGOVIZIN , B NAROSKA , T NAUMANN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , R NISIUS , G NOWAK , G W NOYES , M NYBERG , H OBERLACK , U OBROCK , J E OLSSON , S ORENSTEIN , F OULDSAADA , C PASCAUD , G D PATEL , E PEPPEL , S PETERS , H T PHILLIPS , J P PHILLIPS , C PICHLER , W PILGRAM , D PITZL , S PRELL , R PROSI , G RADEL , F RAUPACH , K RAUSCHNABEL , P REIMER , S REINSHAGEN , P RIBARICS , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , S M ROBERTSON , P ROBMANN , R ROOSEN , A ROSTOVTSEV , C ROYON , M RUDOWICZ , M RUFFER , S RUSAKOV , K RYBICKI , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , W SCHMITZ , V SCHRODER , M SCHULZ , B SCHWAB , A SCHWIND , W SCOBEL , U SEEHAUSEN , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , L SMOLIK , Y SOLOVIEV , H SPITZER , P STAROBA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , I TICHOMIROV , P TRUOL , J TURNAU , J TUTAS , L URBAN , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , R VICK , G VILLET , E VOGEL , K WACKER , I W WALKER , A WALTHER , G WEBER , D WEGENER , A WEGNER , H P WELLISCH , S WILLARD , M WINDE , G G WINTER , T WOLFF , L A WOMERSLEY , A E WRIGHT , N WULFF , T P YIOU , J ZACEK , P ZAVADA , C ZEITNITZ , H ZIAEEPOUR , M ZIMMER , W ZIMMERMANN , F ZOMER (1993) MEASUREMENT OF THE PROTON STRUCTURE-FUNCTION F2(CHI,Q2) IN THE LOW-CHI REGION AT HERA NUCLEAR PHYSICS B 407: 3. 515-535 OCT 25 Abstract: A measurement of the proton structure function F2(x, Q2) is presented with about 1000 neutral current deep inelastic scattering events for Bjorken x in the range x congruent-to 10(-2) - 10(-4) and Q2 > 5 GeV2. The measurement is based on an integrated luminosity of 22.5 nb-1 recorded by the H1 detector in the first year of HERA operation. The structure function F2(x, Q2) shows a significant rise with decreasing x.
Notes:
I ABT , T AHMED , V ANDREEV , B ANDRIEU , R D APPUHN , M ARPAGAUS , A BABAEV , J BAN H BARWOLFF , P BARANOV , E BARRELET , W BARTEL , U BASSLER , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , G BERTRANDCOREMANS , M BESANCON , P BIDDULPH , E BINDER , A BISCHOFF , J C BIZOT , V BLOBEL , K BORRAS , P C BOSETTI , V BOUDRY , C BOURDARIOS , F BRASSE , U BRAUN , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , L BUNGENER , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , M COLOMBO , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , J CVACH , S DAGORET , J B DAINTON , M DANILOV , WD DAU A W E DANN , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , M DEVEL , A DEROECK , P DINGUS , C DOLLFUS , J D DOWELL , H B DREIS , A DRESCHER , J DUBOC , D DULLMANN , O DUNGER , H DUHM , R EBBINGHAUS , M EBERLE , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , N N ELLIS , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , I F FENSOME , J FERENCEI , F FERRAROTTO , K FLAMM , W FLAUGER , M FLEISCHER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , P FUHRMANN , E GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , A GELLRICH , M GENNIS , H GENZEL , R GERHARDS , L GODFREY , U GOERLACH , L GOERLICH , M GOLDBERG , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , H GREIF , G GRINDHAMMER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , D HANDSCHUH , E M HANLON , M HAPKE , J HARJES , R HAYDAR , W J HAYNES , J HEATHERINGTON , V HEDBERG , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , W HILDESHEIM , P HILL , C D HILTON , J HLADKY , K C HOEGER , P HUET , H HUFNAGEL , N HUOT , M IBBOTSON , H ITTERBECK , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , T JANSEN , L JONSSON , K JOHANNSEN , D P JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , S KASARIAN , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , I R KENYON , S KERMICHE , C KEUKER , C KIESLING , M KLEIN , C KLEINWORT , W KO G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , F LAMARCHE , R LANDER , M P J LANDON , W LANGE , R LANGKAU , P LANIUS , J F LAPORTE , A LEBEDEV , A LEUSCHNER , C LEVERENZ , S LEVONIAN , C LEY D LEWIN , A LINDNER , G LINDSTROM , F LINSEL , J LIPINSKI , P LOCH , H LOHMANDER , G C LOPEZ , D LUERS , N MAGNUSSEN , E MALINOVSKI , S MANI , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , A MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , D MERCER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , V MILONE , E MONNIER , F MOREAU , J MOREELS , J V MORRIS , K MULLER , P MURIN , S A MURRAY , V NAGOVIZIN , B NAROSKA , T NAUMANN , D NEWTON , D NEYRET , H K NGUYEN , F NIEBERGALL , R NISIUS , G NOWAK , G W NOYES , M NYBERG , H OBERLACK , U OBROCK , J E OLSSON , S ORENSTEIN , F OULDSAADA , C PASCAUD , G D PATEL , E PEPPEL , S PETERS , H T PHILLIPS , J P PHILLIPS , C PICHLER , W PILGRAM , D PITZL , S PRELL , R PROSI , G RADEL , F RAUPACH , K RAUSCHNABEL , P REIMER , P RIBARICS , V RIECH , J RIEDLBERGER , S RIESS , M RIETZ , S M ROBERTSON , P ROBMANN , R ROOSEN , A ROSTOVTSEV , C ROYON , M RUDOWICZ , M RUFFER , S RUSAKOV , K RYBICKI , N SAHLMANN , E SANCHEZ , D P C SANKEY , M SAVITSKY , P SCHACHT , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , W SCHMITZ , V SCHRODER , M SCHULZ , A SCHWIND , W SCOBEL , U SEEHAUSEN , R SELL , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , L N SHTARKOV , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , L SMOLIK , Y SOLOVIEV , H SPITZER , P STAROBA , M STEENBOCK , P STEFFEN , R STEINBERG , B STELLA , K STEPHENS , J STIER , U STOSSLEIN , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , R E TAYLOR , V TCHERNYSHOV , C THIEBAUX , G THOMPSON , I TICHOMIROV , P TRUOL , J TURNAU , J TUTAS , L URBAN , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , A VARTAPETIAN , Y VAZDIK , M VECKO , P VERRECCHIA , R VICK , G VILLET , E VOGEL , K WACKER , I W WALKER , A WALTHER , G WEBER , D WEGENER , A WEGNER , H P WELLISCH , S WILLARD , M WINDE , G G WINTER , T WOLFF , L A WOMERSLEY , A E WRIGHT , N WULFF , T P YIOU , J ZACEK , P ZAVADA , C ZEITNITZ , H ZIAEEPOUR , M ZIMMER , W ZIMMERMANN , F ZOMER (1993) MEASUREMENT OF INCLUSIVE JET CROSS-SECTIONS IN PHOTOPRODUCTION AT HERA PHYSICS LETTERS B 314: 3-4. 436-444 SEP 23 Abstract: The inclusive jet cross section in photoproduction has been measured as a function of transverse energy and pseudorapidity using the H1 detector at the HERA electron-proton collider. The results are compared with leading order QCD calculations.
Notes:
J BAN B ANDRIEU , E BARRELET , H BERGSTEIN , G BERNARDI , M BESANCON , E BINDER , H BLUME , K BORRAS , V BOUDRY , F BRASSE , W BRAUNSCHWEIG , V BRISSON , A J CAMPBELL , T CARLI , M COLOMBO , C COUTURES , G COZZIKA , M DAVID , B DELCOURT , L DELBUONO , M DEVEL , P DINGUS , A DRESCHER , J DUBOC , O DUNGER , R EBBINGHAUS , S EGLI , N N ELLIS , J FELTESSE , Y FENG , F FERRAROTTO , W FLAUGER , M FLIESER , K GAMERDINGER , J GAYLER , L GODFREY , L GOERLICH , M GOLDBERG , R GRASSLER , T GREENSHAW , H GREIF , M HAGUENAUER , L HAJDUK , O HAMON , P HARTZ , V HAUSTEIN , R HAYDAR , W HILDESHEIM , N HUOT , M A JABIOL , A JACHOLKOWSKA , M JAFFRE , H JUNG , F JUST , C KIESLING , T KIRCHHOFF , F KOLE , V KORBEL , M KORN , W KRASNY , J P KUBENKA , H KUSTER , J KURZHOFER , B KUZNIK , R LANDER , J F LAPORTE , U LENHARDT , P LOCH , D LUERS , J MARKS , J MARTYNIAK , T MERZ , A NAU B NAROSKA , H K NGUYEN , F NIEBERGALL , H OBERLACK , U OBROCK , F OULDSAADA , HB PYO C PASCAUD , K RAUSCHNABEL , P RIBARICS , M RIETZ , C ROYON , V RUSINOV , N SAHLMANN , E SANCHEZ , P SCHACHT , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , V SHEKELYAN , H SHOOSHTARI , Y SIROIS , P STAROBA , M STEENBOCK , H STEINER , B STELLA , U STRAUMANN , J TURNAU , J TUTAS , L URBAN , C VALLEE , M VECKO , P VERRECCHIA , G VILLET , E VOGEL , A WAGENER , D WEGENER , A WEGNER , H P WELLISCH , T P YIOU , J ZACEK , C ZEITNITZ , F ZOMER (1993) RESULTS FROM PION CALIBRATION RUNS FOR H1 LIQUID ARGON CALORIMETER AND COMPARISONS WITH SIMULATIONS NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 336: 3. 499-509 DEC 1 Abstract: We present results on calibration runs performed with pions at the CERN SPS for different modules of the H1 liquid argon calorimeter which consists of an electromagnetic section with lead absorbers and a hadronic section with steel absorbers. The data cover an energy range from 3.7 to 205 GeV. Detailed comparisons of the data and simulation with GHEISHA 8 in the framework of GEANT 3.14 are presented. The measured pion induced shower profiles are well described by the simulation. The total signal of pions on an energy scale determined from electron measurements is reproduced to better than 3% in various module configurations. After application of weighting functions, determined from Monte Carlo data and needed to achieve compensation, the reconstructed measured energies agree with simulation to about 3%. The energies of hadronic showers are reconstructed with a resolution of about 50%/root E + 2%. This result is achieved by inclusion of signals from an iron streamer tube tail catcher behind the liquid argon stacks.
Notes:
1992
R M DREES , C WALTHAM , T BERNASCONI , S EGLI , E HERMES , F MUHEIM , C NIEBUHR , H PRUYS , A VANDERSCHAAF , W BERTL , M GROSSMANNHANDSCHIN , N LORDONG , D VERMEULEN , H K WALTER , R EICHLER , L FELAWKA , T KOZLOWSKI , S PLAYFER , J MARTINO (1992) SEARCH FOR WEAKLY INTERACTING NEUTRAL BOSONS PRODUCED IN PI-P INTERACTIONS AT REST AND DECAYING INTO E+E- PAIRS PHYSICAL REVIEW LETTERS 68: 26. 3845-3848 JUN 29 Abstract: We present the result of a search for weakly interacting neutral bosons (X) produced in pi--p interactions at rest and decaying into e+e- pairs. The data sample searched contains 98 400-pi-0-->e+e- gamma-decays and 27 200 pi--p-->ne+e- events, each with an e+e- invariant mass between 25 and 139 MeV/c2. They were observed in the SINDRUM I magnetic spectrometer at the Paul Scherrer Institute (Switzerland). We measure upper limits for the branching ratios GAMMA(pi-0-->X-gamma, X-->e+e-)/GAMMA(pi-0-->all) and GAMMA(pi--p-->Xn, X-->e+e-)/GAMMA(pi--p-->all) for X lifetimes between 10(-23) and 10(-11) s.
Notes:
K MULLER , H P BECK , K BOSIGER , S EGLI , S EICHENBERGER , C A MEYER , P ROBMANN , B A SCHMID , U STRAUMANN , P TRUOL , R EICHLER , R HOLZREUTER , J RIEDLBERGER (1992) CONSTRUCTION AND PERFORMANCE OF A THIN CYLINDRICAL MULTIWIRE PROPORTIONAL CHAMBER WITH CATHODE PAD READOUT FOR THE H1-EXPERIMENT NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 312: 3. 457-466 FEB 15 Abstract: We discuss the construction of a thin (0.14% radiation length) cylindrical multiwire proportional chamber with cathode pad readout used in the first level vertex trigger of the H1-experiment at HERA (DESY). The chamber has an active length of 2190 mm, and anode plane radii of 157 and 166 mm with a 3 mm gap. The cathode consists of a graphite layer on a Kapton foil with a resistivity of 400 k-OMEGA/square. In order to have a two-dimensional readout the Al-layer on the back of the outer cathode of each chamber is segmented in 36 mm wide pads covering 45-degrees in azimuth. The performance of the chamber with various gas mixtures was studied. Typically a length of the high voltage plateau of 200 V and a time resolution of 75 ns base width has been achieved, sufficient to separate individual HERA bunch crossings. The behavior of the chamber at pad boundaries has been measured and the performance for particles crossing at angles down to curly theta = 16-degrees is described.
Notes:
R M DREES , C WALTHAM , T BERNASCONI , S EGLI , E HERMES , F MUHEIM , C NIEBUHR , H PRUYS , A VANDERSCHAAF , W BERTL , M GROSSMANNHANDSCHIN , N LORDONG , D VERMEULEN , H K WALTER , R EICHLER , L FELAWKA , T KOZLOWSKI , S PLAYFER , J MARTINO (1992) MEASUREMENT OF THE PI-0 ELECTROMAGNETIC TRANSITION FORM-FACTOR PHYSICAL REVIEW D 45: 5. 1439-1447 MAR 1 Abstract: We present the result of a measurement of the pi(0) electromagnetic transition form factor in the time-like region of momentum transfer. From a data sample of 54 000 pi(0) --> e+e-gamma-decays, observed in the SINDRUM I magnetic spectrometer at the Paul Scherrer Institute (Switzerland), we measure a value of the form factor slope a = 0.025 +/- 0.014 (stat) +/- 0.026 (syst). This value is consistent with both the results of the recent measurement by CELLO (DESY) in the spacelike region, and with the vector-meson-dominance prediction of a almost-equal-to 0.03.
Notes:
S EICHENBERGER , H P BECK , S EGLI , K MULLER , C A MEYER , P ROBMANN , U STRAUMANN , P TRUOL , M ARPAGAUS , R BERNET , R EICHLER , C GRAB , J RIEDLBERGER , T WOLFF (1992) A FAST PIPELINED TRIGGER FOR THE H1 EXPERIMENT BASED ON MULTIWIRE PROPORTIONAL CHAMBER SIGNALS NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 323: 1-2. 532-536 DEC 1 Abstract: Based on a total of 1920 pads from two cylindrical and one planar double layer multiwire proportional chamber, the vertex position of ep collisions along the beam axis of the HERA storage ring is reconstructed. This allows discrimination between ep events, originating from the nominal interaction region, and background, introduced mainly by proton beam pipe and proton rest gas interactions. The trigger works in a pipelined manner, delivering a delayed decision every 96 ns, corresponding to the accelerator bunch crossing frequency. It employs custom designed gate arrays as well as XILINX logic cell arrays and a 16 Mbyte static RAM lookup table. Computer controlled debugging procedures take advantage of the reprogrammability of XILINX chips.
Notes:
T AHMED , V ANDREEV , B ANDRIEU , M ARPAGAUS , A BABAYEV , J BAN H BARWOLFF , P BARANOV , E BARRELET , W BARTEL , U BASSLER , G A BECK , H P BECK , H J BEHREND , A BELOUSOV , C BERGER , H BERGSTEIN , G BERNARDI , R BERNET , U BERTHON , G BERTRANDCOREMANS , M BESANCON , P BIDDULPH , E BINDER , J C BIZOT , V BLOBEL , K BORRAS , P C BOSETTI , V BOUDRY , C BOURDARIOS , F BRASSE , U BRAUN , W BRAUNSCHWEIG , V BRISSON , D BRUNCKO , J BURGER , F W BUSSER , A BUNIATIAN , S BURKE , G BUSCHHORN , A J CAMPBELL , T CARLI , F CHARLES , D CLARKE , A B CLEGG , M COLOMBO , J A COUGHLAN , A COURAU , C COUTURES , G COZZIKA , L CRIEGEE , J CVACH , J B DAINTON , M DANILOV , WD DAU A W E DANN , M DAVID , E DEFFUR , B DELCOURT , L DELBUONO , M DEVEL , A DEROECK , P DINGUS , C DOLLFUS , J D DOWELL , H B DREIS , A DRESCHER , J DUBOC , D DULLMANN , O DUNGER , H DUHM , M EBERLE , J EBERT , T R EBERT , G ECKERLIN , V EFREMENKO , S EGLI , S EICHENBERGER , R EICHLER , F EISELE , E EISENHANDLER , N N ELLIS , R J ELLISON , E ELSEN , M ERDMANN , E EVRARD , L FAVART , A FEDOTOV , D FEEKEN , R FELST , J FELTESSE , Y FENG , I F FENSOME , J FERENCEI , F FERRAROTTO , W FLAUGER , M FLEISCHER , G FLUGGE , A FOMENKO , B FOMINYKH , M FORBUSH , J FORMANEK , J M FOSTER , G FRANKE , E FRETWURST , P FUHRMANN , E GABATHULER , K GAMERDINGER , J GARVEY , J GAYLER , A GELLRICH , M GENNIS , U GENSCH , H GENZEL , R GERHARDS , D GILLESPIE , L GODFREY , U GOERLACH , L GOERLICH , M GOLDBERG , A M GOODALL , I GORELOV , P GORITCHEV , C GRAB , H GRASSLER , R GRASSLER , T GREENSHAW , H GREIF , G GRINDHAMMER , C GRUBER , J HAACK , D HAIDT , L HAJDUK , O HAMON , D HANDSCHUH , E M HANLON , M HAPKE , J HARJES , P HARTZ , R HAYDAR , W J HAYNES , J HEATHERINGTON , V HEDBERG , R HEDGECOCK , G HEINZELMANN , R C W HENDERSON , H HENSCHEL , R HERMA , I HERYNEK , W HILDESHEIM , P HILL , C D HILTON , J HLADKY , K C HOEGER , P HUET , H HUFNAGEL , N HUOT , M IBBOTSON , M A JABIOL , A JACHOLKOWSKA , C JACOBSSON , M JAFFRE , L JONSSON , K JOHANNSEN , D JOHNSON , L JOHNSON , H JUNG , P I P KALMUS , S KASARIAN , R KASCHOWITZ , P KASSELMANN , U KATHAGE , H H KAUFMANN , I R KENYON , S KERMICHE , C KIESLING , M KLEIN , C KLEINWORT , G KNIES , T KOHLER , H KOLANOSKI , F KOLE , S D KOLYA , V KORBEL , M KORN , P KOSTKA , S K KOTELNIKOV , M W KRASNY , H KREHBIEL , D KRUCKER , U KRUGER , J P KUBENKA , H KUSTER , M KUHLEN , T KURCA , J KURZHOFER , B KUZNIK , R LANDER , M P J LANDON , R LANGKAU , P LANIUS , J F LAPORTE , A LEBEDEV , U LENHARDT , A LEUSCHNER , C LEVERENZ , D LEVIN , C LEY S LEVONIAN , G LINDSTROM , P LOCH , H LOHMANDER , G C LOPEZ , D LUERS , N MAGNUSSEN , E MALINOVSKI , S MANI , P MARAGE , J MARKS , R MARSHALL , J MARTENS , R MARTIN , H U MARTYN , J MARTYNIAK , S MASSON , A MAVROIDIS , S J MAXFIELD , S J MCMAHON , A MEHTA , K MEIER , T MERZ , C A MEYER , H MEYER , J MEYER , S MIKOCKI , V MILONE , E MONNIER , F MOREAU , J MOREELS , J V MORRIS , J M MORTON , K MULLER , P MURIN , S A MURRAY , V NAGOVIZIN , B NAROSKA , T NAUMANN , D NEWTON , H K NGUYEN , F NIEBERGALL , R NISIUS , G NOWAK , G W NOYES , M NYBERG , H OBERLACK , U OBROCK , J E OLSSON , S ORENSTEIN , F OULDSAADA , C PASCAUD , G D PATEL , E PEPPEL , S PETERS , H T PHILLIPS , J P PHILLIPS , C PICHLER , W PILGRAM , D PITZL , R PROSI , F RAUPACH , K RAUSCHNABEL , P REIMER , P RIBARICS , V RIECH , J RIEDLBERGER , M RIETZ , S M ROBERTSON , P ROBMANN , R ROOSEN , A ROSTOVTSEV , C ROYON , M RUDOWICZ , M RUFFER , S RUSAKOV , K RYBICKI , E RYSECK , J SACTON , N SAHLMANN , E SANCHEZ , D P SANKEY , M SAVITSKY , P SCHACHT , P SCHLEPER , W VONSCHLIPPE , C SCHMIDT , D SCHMIDT , W SCHMITZ , V SCHRODER , M SCHULZ , A SCHWIND , W SCOBEL , U SEEHAUSEN , R SELL , M SEMAN , A SEMENOV , V SHEKELYAN , I SHEVIAKOV , H SHOOSHTARI , G SIEGMON , U SIEWERT , Y SIROIS , I O SKILLICORN , P SMIRNOV , J R SMITH , L SMOLIK , Y SOLOVIEV , H SPITZER , P STAROBA , M STEENBOCK , P STEFFEN , R STEINBERG , H STEINER , B STELLA , K STEPHENS , J STRACHOTA , U STRAUMANN , W STRUCZINSKI , J P SUTTON , R E TAYLOR , G THOMPSON , R J THOMPSON , I TICHOMIROV , C TRENKEL , P TRUOL , V TCHERNYSHOV , J TURNAU , J TUTAS , L URBAN , A USIK , S VALKAR , A VALKAROVA , C VALLEE , P VANESCH , A VARTAPETIAN , J VASDIK , M VECKO , P VERRECCHIA , R VICK , G VILLET , E VOGEL , K WACKER , I W WALKER , A WALTHER , G WEBER , D WEGENER , A WEGNER , H P WELLISCH , S WILLARD , M WINDE , G G WINTER , M T WOLFF , L A WOMERSLEY , A E WRIGHT , N WULFF , T P YIOU , J ZACEK , P ZAVADA , C ZEITNITZ , H ZIAEEPOUR , M ZIMMER , W ZIMMERMANN , F ZOMER (1992) HARD SCATTERING IN GAMMA-P INTERACTIONS PHYSICS LETTERS B 297: 1-2. 205-213 DEC 24 Abstract: We report on the investigation of the final state in interactions of quasi-real photons with protons. The data were taken with the H1 detector at the HERA ep collider. Evidence for hard interactions is seen in both single particle spectra and jet formation. The data can best be described by inclusion of resolved photon processes as predicted by QCD.
Notes:
T WOLFF , J RIEDLBERGER , M ARPAGAUS , R BERNET , R EICHLER , C GRAB , H P BECK , S EGLI , S EICHENBERGER , K MULLER , C MEYER , P ROBMANN , U STRAUMANN , P TRUOL (1992) A DRIFT CHAMBER TRACK FINDER FOR THE 1ST LEVEL TRIGGER OF THE H1 EXPERIMENT NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 323: 1-2. 537-541 DEC 1 Abstract: The information from the central drift chamber of the H1 experiment is used in a first level trigger to find and count charged tracks, originating from genuine ep collisions at the HERA storage ring. Background processes, predominantly from beam-wall and beam-gas interactions, are discriminated because their distance of closest approach to the collision vertex differs from good events. The track finder is designed in a pipelined fashion, producing decisions at the bunch crossing frequency of f(b) = 10.4 MHz, however delayed by a fixed decision time of 2.3 mus. This operation is deadtime free but still uniquely related to the specific bunch crossing 24 cycles earlier. The hardware implementation relies on XILINX logic cell arrays which are programmable providing a high flexibility.
Notes:
1989
S EGLI , R ENGFER , C GRAB , E A HERMES , N KRAUS , H S PRUYS , A VANDERSCHAAF , R EICHLER , T KOZLOWSKI , C NIEBUHR , H K WALTER , W BERTL , N LORDONG , D VERMEULEN , U BELLGARDT , G OTTER (1989) MEASUREMENT OF THE DECAY PI-+-]E+VEE+E- AND SEARCH FOR A LIGHT HIGGS BOSON PHYSICS LETTERS B 222: 3-4. 533-537 MAY 25 Abstract:
Notes:
C NIEBUHR , R EICHLER , L FELAWKA , T KOZLOWSKI , S PLAYFER , H K WALTER , A VANDERSCHAAF , S EGLI , M GROSSMANNHANDSCHIN , E HERMES , F MUHEIM , H PRUYS , D VERMEULEN , W BERTL , N LORDONG , J MARTINO , R M DREES , C WALTHAM , U BELLGARDT (1989) SEARCH FOR THE DECAY PI-0-]E+E- PHYSICAL REVIEW D 40: 9. 2796-2802 NOV 1 Abstract:
Notes:
1988
U BELLGARDT , G OTTER , R EICHLER , L FELAWKA , C NIEBUHR , H K WALTER , W BERTL , N LORDONG , J MARTINO , S EGLI , R ENGFER , C GRAB , M GROSSMANNHANDSCHIN , E A HERMES , N KRAUS , F MUHEIM , H PRUYS , A VANDERSCHAAF , D VERMEULEN (1988) SEARCH FOR THE DECAY MU+-]E+E+E- NUCLEAR PHYSICS B 299: 1. 1-6 MAR 28 Abstract:
Notes:
1987
1986
S EGLI , R ENGFER , C GRAB , E A HERMES , H S PRUYS , A VANDERSCHAAF , D VERMEULEN , R EICHLER , N KRAUS , C NIEBUHR , H K WALTER , W BERTL , N LORDONG , U BELLGARDT , G OTTER , T KOZLOWSKI (1986) FIRST OBSERVATION OF THE DECAY PI+-]E+NU-E+E- AND A DETERMINATION OF THE FORM-FACTORS FV, FA, R PHYSICS LETTERS B 175: 1. 97-100 JUL 24 Abstract:
Notes:
R EICHLER , L FELAWKA , N KRAUS , C NIEBUHR , H K WALTER , S EGLI , R ENGFER , C GRAB , E A HERMES , H S PRUYS , A VANDERSCHAAF , D VERMEULEN , W BERTL , N LORDONG , U BELLGARDT , G OTTER , T KOZLOWSKI , J MARTINO (1986) LIMITS FOR SHORT-LIVED NEUTRAL PARTICLES EMITTED IN MU+ OR PI+ DECAY PHYSICS LETTERS B 175: 1. 101-104 JUL 24 Abstract:
Notes:
1985
1984
W BERTL , R EICHLER , L FELAWKA , H K WALTER , G BOWDEN , S EGLI , R ENGFER , C GRAB , E A HERMES , D HERTER , P HEUSI , N KRAUS , R J POWERS , H S PRUYS , A VANDERSCHAAF , J J DOMINGO , J JANSEN , N LORDONG , J MERGAERT , J MARTINO (1984) A NEW UPPER LIMIT FOR THE DECAY MU+-]E+E+E- PHYSICS LETTERS B 140: 5-6. 299-303 Abstract:
Notes:
W BERTL , M DOSER , R EICHLER , L FELAWKA , H K WALTER , G BOWDEN , S EGLI , R ENGFER , K ESSLINGER , C GRAB , E A HERMES , D HERTER , P HEUSI , N KRAUS , R J POWERS , H PRUYS , A VANDERSCHAAF , J J DOMINGO , J JANSEN , N LORDONG , J MERGAERT , D MADEN , W SCHOEPS , J MARTINO (1984) SEARCH FOR MU--]3E WITH SINDRUM AIP CONFERENCE PROCEEDINGS 108. 163-170 Abstract:
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