Measurement of prompt photons with associated jets in photoproduction at HERA

S. Chekanov, M. Derrick, S. Magill, S. Miglioranzi, B. Musgrave, D. Nicholass,J. Repond,R. Yoshida, M.C.K. Mattingly, N. Pavel,A.G. Yagües Molina, S. Antonelli, P. Antonioli, G. Bari,M. Basile, L. Bellagamba, M. Bindi, D. Boscherini,A. Bruni, G. Bruni,L. Cifarelli,F. Cindolo, A. Contin,M. Corradi,S. De Pasquale,G. Iacobucci, A. Margotti, R. Nania, A. Polini, L. Rinaldi, G. Sartorelli, A. Zichichi, G. Aghuzumtsyan, D. Bartsch, I. Brock, S. Goers, H. Hartmann, E. Hilger,H.-P. Jakob, M. Jüngst, O.M. Kind,E. Paul, J. Rautenberg, R. Renner, U. Samson, V. Schönberg,M. Wang, M. Wlasenko,N.H. Brook,G.P. Heath,J.D. Morris, T. Namsoo,M. Capua, S. Fazio, A. Mastroberardino,M. Schioppa, G. Susinno, E. Tassi,J.Y. Kim,K.J. Ma, Z.A. Ibrahim, B. Kamaluddin, W.A.T. Wan Abdullah, Y. Ning, Z. Ren, F. Sciulli, J. Chwastowski, A. Eskreys, J. Figiel, A. Galas,M. Gil, K. Olkiewicz, P. Stopa, L. Zawiejski, L. Adamczyk,T. Bołd,I. Grabowska-Bołd, D. Kisielewska, J. Łukasik, M. Przybycień, L. Suszycki, A. Kotański, W. Słomiński, V. Adler, U. Behrens,I. Bloch, A. Bonato,K. Borras, N. Coppola, J. Fourletova, A. Geiser, D. Gladkov, P. Göttlicher, I. Gregor, O. Gutsche, T. Haas, W. Hain,C. Horn, B. Kahle, U. Kötz, H. Kowalski, H. Lim, E. Lobodzinska, B. Löhr, R. Mankel, I.-A. Melzer-Pellmann, A. Montanari,C.N. Nguyen, D. Notz, A.E. Nuncio-Quiroz, R. Santamarta, U. Schneekloth, A. Spiridonov, H. Stadie, U. Stösslein, D. Szuba, J. Szuba, T. Theedt, G. Watt,G. Wolf, K. Wrona, C. Youngman, W. Zeuner, S. Schlenstedt, G. Barbagli, E. Gallo, P.G. Pelfer, A. Bamberger, D. Dobur, F. Karstens, N.N. Vlasov, P.J. Bussey, A.T. Doyle, W. Dunne, J. Ferrando, D.H. Saxon, I.O. Skillicorn, I. Gialas, T. Gosau, U. Holm, R. Klanner, E. Lohrmann, H. Salehi, P. Schleper, T. Schörner-Sadenius, J. Sztuk, K. Wichmann, K. Wick, C. Foudas, C. Fry, K.R. Long, A.D. Tapper, M. Kataoka, T. Matsumoto, K. Nagano, K. Tokushuku, S. Yamada, Y. Yamazaki, A.N. Barakbaev, E.G. Boos, A. Dossanov, N.S. Pokrovskiy, B.O. Zhautykov, D. Son,J. de Favereau, K. Piotrzkowski, F. Barreiro, C. Glasman,M. Jimenez, L. Labarga,J. del Peso, E. Ron, J. Terrón,M. Zambrana, F. Corriveau, C. Liu,R. Walsh, C. Zhou, T. Tsurugai, A. Antonov, B.A. Dolgoshein, I. Rubinsky, V. Sosnovtsev, A. Stifutkin, S. Suchkov, R.K. Dementiev, P.F. Ermolov, L.K. Gladilin, I.I. Katkov, L.A. Khein, I.A. Korzhavina, V.A. Kuzmin, B.B. Levchenko, O.Y. Lukina, A.S. Proskuryakov, L.M. Shcheglova, D.S. Zotkin, S.A. Zotkin, N.P. Zotov, I. Abt, C. Büttner, A. Caldwell, D. Kollar, W.B. Schmidke, J. Sutiak, G. Grigorescu, A. Keramidas, E. Koffeman, P. Kooijman, A. Pellegrino, H. Tiecke,M. Vázquez, L. Wiggers, N. Brümmer, B. Bylsma, L.S. Durkin,A. Lee, T.Y. Ling, P.D. Allfrey,M.A. Bell, A.M. Cooper-Sarkar, A. Cottrell, R.C.E. Devenish, B. Foster, C. Gwenlan, K. Korcsak-Gorzo, S. Patel, V. Roberfroid, A. Robertson, P.B. Straub, C. Uribe-Estrada, R. Walczak, P. Bellan, A. Bertolin, R. Brugnera, R. Carlin, R. Ciesielski,F. Dal Corso, S. Dusini, A. Garfagnini, S. Limentani, A. Longhin, L. Stanco, M. Turcato, B.Y. Oh, A. Raval, J.J. Whitmore, Y. Iga,G. D’Agostini, G. Marini, A. Nigro, J.E. Cole, J.C. Hart, H. Abramowicz, A. Gabareen, R. Ingbir, S. Kananov, A. Levy, M. Kuze, R. Hori, S. Kagawa, S. Shimizu, T. Tawara, R. Hamatsu, H. Kaji, S. Kitamura, O. Ota, Y.D. Ri, M.I. Ferrero, V. Monaco, R. Sacchi, A. Solano, M. Arneodo, M. Ruspa, S. Fourletov,J.F. Martin, S.K. Boutle, J.M. Butterworth, R. Hall-Wilton, T.W. Jones, J.H. Loizides, M.R. Sutton, C. Targett-Adams, M. Wing, B. Brzozowska, J. Ciborowski, G. Grzelak, P. Kulinski, P. Łużniak, J. Malka, R.J. Nowak, J.M. Pawlak, T. Tymieniecka, A. Ukleja, J. Ukleja, A.F. Żarnecki, M. Adamus, P. Plucinski, Y. Eisenberg, I. Giller, D. Hochman, U. Karshon, M. Rosin, E. Brownson, T. Danielson, A. Everett, D. Kçira, D.D. Reeder, P. Ryan, A.A. Savin, W.H. Smith, H. Wolfe, S. Bhadra, C.D. Catterall, Y. Cui, G. Hartner, S. Menary, U. Noor, M. Soares, J. Standage, J. Whyte

The European Physical Journal C(2006)

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摘要
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 γ+jet cross sections were reconstructed as functions of the transverse energy, pseudorapidity and x γ 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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关键词
Monte Carlo,Transverse Energy,ZEUS Collaboration,Deeply Virtual Compton Scattering,Prompt Photon
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