Measurement of dijet photoproduction for events with a leading neutron at HERA

S. Chekanov,M. Derrick,S. Magill,B. Musgrave,D. Nicholass,J. Repond,R. Yoshida,M.C.K. Mattingly,P. Antonioli,G. Bari,L. Bellagamba, D. Boscherini,A. Bruni,G. Bruni,F. Cindolo,M. Corradi,G. Iacobucci, A. Margotti,R. Nania,A. Polini,S. Antonelli,M. Basile,M. Bindi, L. Cifarelli, A. Contin,S. De Pasquale,G. Sartorelli, A. Zichichi,D. Bartsch, I. Brock,H. Hartmann,E. Hilger,H.-P. Jakob, M. Jüngst,A.E. Nuncio-Quiroz,E. Paul,U. Samson,V. Schönberg,R. Shehzadi,M. Wlasenko,J.D. Morris, M. Kaur,P. Kaur,I. Singh,M. Capua,S. Fazio,A. Mastroberardino,M. Schioppa,G. Susinno,E. Tassi,J.Y. Kim,Z.A. Ibrahim,F. Mohamad Idris,B. Kamaluddin,W.A.T. Wan Abdullah,Y. Ning,Z. Ren,F. Sciulli,J. Chwastowski,A. Eskreys,J. Figiel,A. Galas,K. Olkiewicz,B. Pawlik,P. Stopa,L. Zawiejski,L. Adamczyk,T. Bołd,I. Grabowska-Bołd, D. Kisielewska,J. Łukasik,M. Przybycień,L. Suszycki,A. Kotański,W. Słomiński,O. Bachynska,O. Behnke, J. Behr, U. Behrens,C. Blohm,K. Borras,D. Bot,R. Ciesielski,N. Coppola,S. Fang, A. Geiser,P. Göttlicher,J. Grebenyuk,I M Gregor,T. Haas,W. Hain,A. Hüttmann,F. Januschek,B. Kahle,I.I. Katkov,U. Klein,U. Kötz,H. Kowalski,V. Libov,M. Lisovyi,E. Lobodzinska,B. Löhr, R. Mankel,I.-A. Melzer-Pellmann,S. Miglioranzi,A. Montanari,T. Namsoo,D. Notz,A. Parenti,P. Roloff,I. Rubinsky,U. Schneekloth, A. Spiridonov,D. Szuba,J. Szuba,T. Theedt,J. Tomaszewska,G. Wolf,K. Wrona,A.G. Yagües-Molina,C. Youngman,W. Zeuner,V. Drugakov,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,M. Forrest,D.H. Saxon,I.O. Skillicorn,I. Gialas,K. Papageorgiu,U. Holm,R. Klanner,E. Lohrmann,Hanno Perrey, P. Schleper,T. Schörner-Sadenius,J. Sztuk, H. Stadie,M. Turcato,K.R. Long,Alexander Tapper,T. Matsumoto,Kunihiro Nagano,K. Tokushuku, S. Yamada,Y. Yamazaki,A.N. Barakbaev,E.G. Boos,N.S. Pokrovskiy,B.O. Zhautykov,V. Aushev,M. Borodin,I. Kadenko,Ie. Korol,O. Kuprash,D. Lontkovskyi,I. Makarenko,Yu. Onishchuk,A. Salii,Iu. Sorokin,A. Verbytskyi,V. Viazlo,O. Volynets,O. Zenaiev,M. Zolko,D. Son,J. de Favereau,Krzysztof Piotrzkowski,F. Barreiro,C. Glasman,M. Jimenez,J. del Peso,Elias Ron,Mara Senghi Soares,J. Terrón,C. Uribe-Estrada,F. Corriveau,J. Schwartz,Chen Zhou,T. Tsurugai,Alexey Antonov,B.A. Dolgoshein,D. Gladkov,V. Sosnovtsev,A. Stifutkin,S. Suchkov,R.K. Dementiev,P.F. Ermolov,L.K. Gladilin,Yu.A. Golubkov,L.A. Khein,I.A. Korzhavina,V.A. Kuzmin,B.B. Levchenko,O.Yu. Lukina,A.S. Proskuryakov,L.M. Shcheglova,D.S. Zotkin,I. Abt,A. Caldwell,D. Kollar,B. Reisert,W.B. Schmidke,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,A.M. Cooper-Sarkar,R.C.E. Devenish,J. Ferrando,B. Foster,C. Gwenlan,K. Horton,K. Oliver,A N Robertson,R. Walczak,A. Bertolin,F. Dal Corso, S. Dusini,A. Longhin,L. Stanco,R. Brugnera,R. Carlin,A. Garfagnini,S. Limentani,B.Y. Oh,Amita Raval,J.J. Whitmore,Y. Iga,G. D'Agostini,G. Marini,A. Nigro,J.C. Hart, H. Abramowicz,R. Ingbir,S. Kananov,A. Levy,A. Stern,Masaki Ishitsuka,T. Kanno,M. Kuze,J. Maeda,R. Hori,Naoaki Okazaki, S. Shimizu,R. Hamatsu,S. Kitamura,O. Ota,Y.D. Ri,M. Costa,M.I. Ferrero,Vincenzo Monaco, R. Sacchi,Valentina Sola, A. Solano,M. Arneodo, M. Ruspa,S. Fourletov,J.F. Martin,T.P. Stewart,Sarah Boutle,J.M. Butterworth,T.W. Jones,J.H. Loizides,M. Wing,B. Brzozowska,J. Ciborowski,G. Grzelak,P. Kulinski,P. Łużniak,J. Malka,R.J. Nowak,J.M. Pawlak,W. Perlanski,A.F. Żarnecki,M. Adamus,Pawel Plucinski,T. Tymieniecka,Y. Eisenberg,D. Hochman,U. Karshon, E. Brownson,D.D. Reeder,A.A. Savin,W.H. Smith,H. Wolfe,S. Bhadra,C.D. Catterall,G F Hartner,U. Noor,J. Whyte

Nuclear Physics B(2010)

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摘要
Differential cross sections for dijet photoproduction and this process in association with a leading neutron, e++p→e++jet+jet+X(+n), have been measured with the ZEUS detector at HERA using an integrated luminosity of 40 pb−1. The fraction of dijet events with a leading neutron was studied as a function of different jet and event variables. Single- and double-differential cross sections are presented as a function of the longitudinal fraction of the proton momentum carried by the leading neutron, xL, and of its transverse momentum squared, pT2. The dijet data are compared to inclusive DIS and photoproduction results; they are all consistent with a simple pion-exchange model. The neutron yield as a function of xL was found to depend only on the fraction of the proton beam energy going into the forward region, independent of the hard process. No firm conclusion can be drawn on the presence of rescattering effects.
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cross section
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