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The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 77 pb(-1). Cross sections were measured for the transverse energy of the photon and the jet larger than 5 and 6 GeV, respectively. The differential gamma+jet cross sections were reconstructed as functions of the transverse energy, pseudorapidity and x(gamma) (obs), the fraction of the incoming photon momentum taken by the photon-jet system. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leading-order (NLO) QCD generally underestimate the cross sections for the transverse energies of prompt photons below 7 GeV, while the k(T)-factorisation QCD calculation agrees with the data better. When the minimum transverse energy of prompt photons is increased to 7 GeV, both NLO QCD and the k(T)-factorisation calculations are in good agreement with the data. RI De Pasquale, Salvatore/B-9165-2008; Wing, Matthew/C-2169-2008; IBRAHIM, ZAINOL ABIDIN/C-1121-2010; Fazio, Salvatore /G-5156-2010; WAN ABDULLAH, WAN AHMAD TAJUDDIN/B-5439-2010; Doyle, Anthony/C-5889-2009; Ferrando, James/A-9192-2012; Gladilin, Leonid/B-5226-2011
The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 77 pb(-1). Cross sections were measured for the transverse energy of the photon and the jet larger than 5 and 6 GeV, respectively. The differential gamma+jet cross sections were reconstructed as functions of the transverse energy, pseudorapidity and x(gamma) (obs), the fraction of the incoming photon momentum taken by the photon-jet system. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leading-order (NLO) QCD generally underestimate the cross sections for the transverse energies of prompt photons below 7 GeV, while the k(T)-factorisation QCD calculation agrees with the data better. When the minimum transverse energy of prompt photons is increased to 7 GeV, both NLO QCD and the k(T)-factorisation calculations are in good agreement with the data.
The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 77 pb(-1). Cross sections were measured for the transverse energy of the photon and the jet larger than 5 and 6 GeV, respectively. The differential gamma+jet cross sections were reconstructed as functions of the transverse energy, pseudorapidity and x(gamma) (obs), the fraction of the incoming photon momentum taken by the photon-jet system. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leading-order (NLO) QCD generally underestimate the cross sections for the transverse energies of prompt photons below 7 GeV, while the k(T)-factorisation QCD calculation agrees with the data better. When the minimum transverse energy of prompt photons is increased to 7 GeV, both NLO QCD and the k(T)-factorisation calculations are in good agreement with the data.
Measurement of prompt photons with associated jets in photoproduction at HERA
Chekanov S.;Derrick M.;Magill S.;Miglioranzi S.;Musgrave B.;Nicholass D.;Repond J.;Yoshida R.;Mattingly M. C. K.;Pavel N.;Molina A. G. Yaguees;Antonelli S.;Antonioli P.;Bari G.;Basile M.;Bellagamba L.;Bindi M.;Boscherini D.;Bruni A.;Bruni G.;Cifarelli L.;Cindolo F.;Contin A.;Corradi M.;De Pasquale S.;Iacobucci G.;Margotti A.;Nania R.;Polini A.;Rinaldi L.;Sartorelli G.;Zichichi A.;Aghuzumtsyan G.;Bartsch D.;Brock I.;Goers S.;Hartmann H.;Hilger E.;Jakob H. P.;Juengst M.;Kind O. M.;Paul E.;Rautenberg J.;Renner R.;Samson U.;Schoenberg V.;Wang M.;Wlasenko M.;Brook N. H.;Heath G. P.;Morris J. D.;Namsoo T.;CAPUA, Marcella;Fazio S.;MASTROBERARDINO, Anna;Schioppa M.;Susinno G.;TASSI, Enrico;Kim J. Y.;Ma K. J.;Ibrahim Z. A.;Kamaluddin B.;Abdullah W. A. T. Wan;Ning Y.;Ren Z.;Sciulli F.;Chwastowski J.;Eskreys A.;Figiel J.;Galas A.;Gil M.;Olkiewicz K.;Stopa P.;Zawiejski L.;Adamczyk L.;Bold T.;Grabowska Bold I.;Kisielewska D.;Lukasik J.;Przybycien M.;Suszycki L.;Kotanski A.;Slominski W.;Adler V.;Behrens U.;Bloch I.;Bonato A.;Borras K.;Coppola N.;Fourletova J.;Geiser A.;Gladkov D.;Goettlicher P.;Gregor I.;Gutsche O.;Haas T.;Hain W.;Horn C.;Kahle B.;Koetz U.;Kowalski H.;Lim H.;Lobodzinska E.;Loehr B.;Mankel R.;Melzer Pellmann I. A.;Montanari A.;Nguyen C. N.;Notz D.;Nuncio Quiroz A. E.;Santamarta R.;Schneekloth U.;Spiridonov A.;Stadie H.;Stoesslein U.;Szuba D.;Szuba J.;Theedt T.;Watt G.;Wolf G.;Wrona K.;Youngman C.;Zeuner W.;Schlenstedt S.;Barbagli G.;Gallo E.;Pelfer P. G.;Bamberger A.;Dobur D.;Karstens F.;Vlasov N. N.;Bussey P. J.;Doyle A. T.;Dunne W.;Ferrando J.;Saxon D. H.;Skillicorn I. O.;Gialas I.;Gosau T.;Holm U.;Klanner R.;Lohrmann E.;Salehi H.;Schleper P.;Schoerner Sadenius T.;Sztuk J.;Wichmann K.;Wick K.;Foudas C.;Fry C.;Long K. R.;Tapper A. D.;Kataoka M.;Matsumoto T.;Nagano K.;Tokushuku K.;Yamada S.;Yamazaki Y.;Barakbaev A. N.;Boos E. G.;Dossanov A.;Pokrovskiy N. S.;Zhautykov B. O.;Son D.;de Favereau J.;Piotrzkowski K.;Barreiro F.;Glasman C.;Jimenez M.;Labarga L.;del Peso J.;Ron E.;Terron J.;Zambrana M.;Corriveau F.;Liu C.;Walsh R.;Zhou C.;Tsurugai T.;Antonov A.;Dolgoshein B. A.;Rubinsky I.;Sosnovtsev V.;Stifutkin A.;Suchkov S.;Dementiev R. K.;Ermolov P. F.;Gladilin L. K.;Katkov I. I.;Khein L. A.;Korzhavina I. A.;Kuzmin V. A.;Levchenko B. B.;Lukina O. Y.;Proskuryakov A. S.;Shcheglova L. M.;Zotkin D. S.;Zotkin S. A.;Zotov N. P.;Abt I.;Buettner C.;Caldwell A.;Kollar D.;Schmidke W. B.;Sutiak J.;Grigorescu G.;Keramidas A.;Koffeman E.;Kooijman P.;Pellegrino A.;Tiecke H.;Vazquez M.;Wiggers L.;Bruemmer N.;Bylsma B.;Durkin L. S.;Lee A.;Ling T. Y.;Allfrey P. D.;Bell M. A.;Cooper Sarkar A. M.;Cottrell A.;Devenish R. C. E.;Foster B.;Gwenlan C.;Korcsak Gorzo K.;Patel S.;Roberfroid V.;Robertson A.;Straub P. B.;Uribe Estrada C.;Walczak R.;Bellan P.;Bertolin A.;Brugnera R.;Carlin R.;Ciesielski R.;DalCorso F.;Dusini S.;Garfagnini A.;Limentani S.;Longhin A.;Stanco L.;Turcato M.;Oh B. Y.;Raval A.;Whitmore J. J.;Iga Y.;D'Agostini G.;Marini G.;Nigro A.;Cole J. E.;Hart J. C.;Abramowicz H.;Gabareen A.;Ingbir R.;Kananov S.;Levy A.;Kuze M.;Hori R.;Kagawa S.;Shimizu S.;Tawara T.;Hamatsu R.;Kaji H.;Kitamura S.;Ota O.;Ri Y. D.;Ferrero M. I.;Monaco V.;Sacchi R.;Solano A.;Arneodo M.;Ruspa M.;Fourletov S.;Martin J. F.;Boutle S. K.;Butterworth J. M.;Hall Wilton R.;Jones T. W.;Loizides J. H.;Sutton M. R.;Targett Adams C.;Wing M.;Brzozowska B.;Ciborowski J.;Grzelak G.;Kulinski P.;Luzniak P.;Malka J.;Nowak R. J.;Pawlak J. M.;Tymieniecka T.;Ukleja A.;Ukleja J.;Zarnecki A. F.;Adamus M.;Plucinski P.;Eisenberg Y.;Giller I.;Hochman D.;Karshon U.;Rosin M.;Brownson E.;Danielson T.;Everett A.;Kcira D.;Reeder D. D.;Ryan P.;Savin A. A.;Smith W. H.;Wolfe H.;Bhadra S.;Catterall C. D.;Cui Y.;Hartner G.;Menary S.;Noor U.;Soares M.;Whyte J.
2007-01-01
Abstract
The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 77 pb(-1). Cross sections were measured for the transverse energy of the photon and the jet larger than 5 and 6 GeV, respectively. The differential gamma+jet cross sections were reconstructed as functions of the transverse energy, pseudorapidity and x(gamma) (obs), the fraction of the incoming photon momentum taken by the photon-jet system. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leading-order (NLO) QCD generally underestimate the cross sections for the transverse energies of prompt photons below 7 GeV, while the k(T)-factorisation QCD calculation agrees with the data better. When the minimum transverse energy of prompt photons is increased to 7 GeV, both NLO QCD and the k(T)-factorisation calculations are in good agreement with the data.
The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 77 pb(-1). Cross sections were measured for the transverse energy of the photon and the jet larger than 5 and 6 GeV, respectively. The differential gamma+jet cross sections were reconstructed as functions of the transverse energy, pseudorapidity and x(gamma) (obs), the fraction of the incoming photon momentum taken by the photon-jet system. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leading-order (NLO) QCD generally underestimate the cross sections for the transverse energies of prompt photons below 7 GeV, while the k(T)-factorisation QCD calculation agrees with the data better. When the minimum transverse energy of prompt photons is increased to 7 GeV, both NLO QCD and the k(T)-factorisation calculations are in good agreement with the data. RI De Pasquale, Salvatore/B-9165-2008; Wing, Matthew/C-2169-2008; IBRAHIM, ZAINOL ABIDIN/C-1121-2010; Fazio, Salvatore /G-5156-2010; WAN ABDULLAH, WAN AHMAD TAJUDDIN/B-5439-2010; Doyle, Anthony/C-5889-2009; Ferrando, James/A-9192-2012; Gladilin, Leonid/B-5226-2011
The photoproduction of prompt photons, together with an accompanying jet, has been studied in ep collisions at a centre-of-mass energy of 318 GeV with the ZEUS detector at HERA using an integrated luminosity of 77 pb(-1). Cross sections were measured for the transverse energy of the photon and the jet larger than 5 and 6 GeV, respectively. The differential gamma+jet cross sections were reconstructed as functions of the transverse energy, pseudorapidity and x(gamma) (obs), the fraction of the incoming photon momentum taken by the photon-jet system. Predictions based on leading-logarithm parton-shower Monte Carlo models and next-to-leading-order (NLO) QCD generally underestimate the cross sections for the transverse energies of prompt photons below 7 GeV, while the k(T)-factorisation QCD calculation agrees with the data better. When the minimum transverse energy of prompt photons is increased to 7 GeV, both NLO QCD and the k(T)-factorisation calculations are in good agreement with the data.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/126862
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