Three- and four-jet final states in photoproduction at HERA

S. Chekanov,M. Derrick,S. Magill,B. Musgrave,D. Nicholass,J. Repond,R. Yoshida,M.C.K. Mattingly, M. Jechow,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,G. Sartorelli, A. Zichichi,D. Bartsch, I. Brock,H. Hartmann,E. Hilger,H.-P. Jakob,M. Jüngst,O.M. Kind,A.E. Nuncio-Quiroz,E. Paul,R. Renner,U. Samson,V. Schönberg,R. Shehzadi,M. Wlasenko,N.H. Brook,G.P. Heath,J.D. Morris,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,C. Blohm,A. Bonato,K. Borras,R. Ciesielski,N. Coppola,A. Dossanov,V. Drugakov,J. Fourletova, A. Geiser,D. Gladkov,P. Göttlicher,J. Grebenyuk,I. Gregor,T. Haas, W. Hain,C. Horn,A. Hüttmann,B. Kahle,I.I. Katkov,U. Klein,U. Kötz,H. Kowalski,E. Lobodzinska,B. Löhr, R. Mankel,I.-A. Melzer-Pellmann,S. Miglioranzi,A. Montanari,T. Namsoo,D. Notz,L. Rinaldi,P. Roloff,I. Rubinsky,R. Santamarta,U. Schneekloth, A. Spiridonov, H. Stadie,D. Szuba,J. Szuba,T. Theedt,G. Wolf,K. Wrona,C. Youngman, W. Zeuner,W. Lohmann,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,M. Forrest,D.H. Saxon,I.O. Skillicorn,I. Gialas,K. Papageorgiu,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,N.S. Pokrovskiy,B.O. Zhautykov,V. Aushev,M. Borodin,A. Kozulia,M. Lisovyi,D. Son,J. de Favereau,K. Piotrzkowski,F. Barreiro,C. Glasman,M. Jimenez, L. Labarga,J. del Peso,E. Ron,M. Soares,J. Terrón,M. Zambrana,F. Corriveau,C. Liu,R. Walsh,C. Zhou,T. Tsurugai,A. Antonov,B.A. Dolgoshein,V. Sosnovtsev,A. Stifutkin,S. Suchkov,R.K. Dementiev,P.F. Ermolov,L.K. Gladilin,L.A. Khein,I.A. Korzhavina,V.A. Kuzmin,B.B. Levchenko,O.Yu. Lukina, A.S. Proskuryakov,L.M. Shcheglova, D.S. Zotkin,S.A. Zotkin,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, R.C.E. Devenish,J. Ferrando,B. Foster,K. Korcsak-Gorzo,K. Oliver,S. Patel,V. Roberfroid,A. Robertson,P.B. Straub,C. Uribe-Estrada, R. Walczak, P. Bellan,A. Bertolin,R. Brugnera,R. Carlin,F. Dal Corso,S. Dusini,A. Garfagnini,S. Limentani,A. Longhin,L. Stanco,M. Turcato,B.Y. Oh,A. Raval,J. Ukleja,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,J. Maeda,R. Hori,S. Kagawa,N. Okazaki, 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,C. Gwenlan,T.W. Jones,J.H. Loizides,M.R. Sutton, M. Wing,B. Brzozowska,J. Ciborowski,G. Grzelak,P. Kulinski,P. Łużniak,J. Malka,R.J. Nowak,J.M. Pawlak,T. Tymieniecka,A. 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,J. Standage,J. Whyte

NUCLEAR PHYSICS B（2008）

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摘要

Three- and four-jet final states have been measured in photoproduction at HERA using the ZEUS detector with an integrated luminosity of 121 pb(-1). The results are presented for jets with transverse energy E-T(jet)> 6 GeV and pseudorapidity vertical bar eta(jet)vertical bar < 2.4, in the kinematic region given by the virtuality of the photon Q(2)<1 GeV2 and the inelasticity 0.2 <= y <= 0.85 and in two mass regions defined as 25 <= M-nj < 50 GeV and M-nj >= 50 GeV, where M-nj is the invariant mass of the n-jet system. The four-jet photoproduction cross section has been measured for the first time and represents the highest-order process studied at HERA. Both the three- and four-jet cross sections have been compared with leading-logarithmic parton-shower Monte Carlo models, with and without multi-parton interactions. The three-jet cross sections have been compared to an O(alpha alpha(2)(s)) perturbative QCD calculation. (c) 2007 Elsevier B.V. All rights reserved.

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QCD,photoproduction,jets,multi-parton interactions

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