Measurement of inelastic J/ψ and ψ ′ photoproduction at HERA

H. Abramowicz,I. Abt,L. Adamczyk, M. Adamus,R. Aggarwal, S. Antonelli,P. Antonioli, A. Antonov,M. Arneodo,O. Arslan,V. Aushev,Y. Aushev, O. Bachynska, A. Bamberger, A. N. Barakbaev, G. Barbagli,G. Bari,F. Barreiro,N. Bartosik,D. Bartsch,M. Basile, O. Behnke, J. Behr, U. Behrens,L. Bellagamba,A. Bertolin,S. Bhadra,M. Bindi,C. Blohm, V. Bokhonov,T. Bold,K. Bondarenko,E. G. Boos,K. Borras, D. Boscherini, D. Bot, I. Brock, E. Brownson,R. Brugnera, N. Brümmer,A. Bruni,G. Bruni,B. Brzozowska, P. J. Bussey, B. Bylsma, A. Caldwell,M. Capua,R. Carlin, C. D. Catterall,S. Chekanov,J. Chwastowski,J. Ciborowski,R. Ciesielski,L. Cifarelli,F. Cindolo,A. Contin,A. M. Cooper-Sarkar,N. Coppola,M. Corradi,F. Corriveau,M. Costa,G. D’Agostini,F. Dal Corso,J. del Peso, R. K. Dementiev,S. De Pasquale, M. Derrick, R. C. E. Devenish, D. Dobur,B. A. Dolgoshein, G. Dolinska,A. T. Doyle,V. Drugakov,L. S. Durkin,S. Dusini,Y. Eisenberg, P. F. Ermolov, A. Eskreys,S. Fang,S. Fazio,J. Ferrando,M. I. Ferrero, J. Figiel,B. Foster, G. Gach,A. Galas, E. Gallo,A. Garfagnini, A. Geiser,I. Gialas,A. Gizhko,L. K. Gladilin,D. Gladkov,C. Glasman,O. Gogota,Yu. A. Golubkov,P. Göttlicher,I. Grabowska-Bold,J. Grebenyuk,I. Gregor,G. Grigorescu,G. Grzelak,O. Gueta,M. Guzik,C. Gwenlan,T. Haas, W. Hain,R. Hamatsu, J. C. Hart,H. Hartmann, G. Hartner, E. Hilger,D. Hochman, R. Hori,A. Hüttmann, Z. A. Ibrahim,Y. Iga, R. Ingbir,M. Ishitsuka, H.-P. Jakob, F. Januschek, T. W. Jones, M. Jüngst,I. Kadenko, B. Kahle,S. Kananov, T. Kanno, U. Karshon,F. Karstens, I. I. Katkov, M. Kaur, P. Kaur,A. Keramidas, L. A. Khein,J. Y. Kim, D. Kisielewska,S. Kitamura,R. Klanner,U. Klein, E. Koffeman,N. Kondrashova,O. Kononenko,P. Kooijman,Ie. Korol, I. A. Korzhavina, A. Kotanski,U. Kötz,H. Kowalski, O. Kuprash,M. Kuze,A. Lee,B. B. Levchenko,A. Levy,V. Libov,S. Limentani, T. Y. Ling,M. Lisovyi,E. Lobodzinska,W. Lohmann, B. Löhr,E. Lohrmann, K. R. Long,A. Longhin, D. Lontkovskyi,O. Yu. Lukina,J. Maeda,S. Magill,I. Makarenko,J. Malka, R. Mankel, A. Margotti,G. Marini,J. F. Martin,A. Mastroberardino, M. C. K. Mattingly, I.-A. Melzer-Pellmann,S. Mergelmeyer, S. Miglioranzi,F. Mohamad Idris,V. Monaco, A. Montanari, J. D. Morris, K. Mujkic,B. Musgrave,K. Nagano,T. Namsoo, R. Nania, A. Nigro,Y. Ning, T. Nobe,D. Notz, R. J. Nowak, A. E. Nuncio-Quiroz, B. Y. Oh,N. Okazaki, K. Olkiewicz,Yu. Onishchuk, K. Papageorgiu,A. Parenti,E. Paul, J. M. Pawlak,B. Pawlik,P. G. Pelfer,A. Pellegrino,W. Perlanski,H. Perrey,K. Piotrzkowski,P. Plucinski,N. S. Pokrovskiy,A. Polini, A. S. Proskuryakov,M. Przybycien,A. Raval, D. D. Reeder,B. Reisert,Z. Ren, J. Repond,Y. D. Ri, A. Robertson, P. Roloff, I. Rubinsky, M. Ruspa, R. Sacchi,U. Samson, G. Sartorelli, A. A. Savin,D. H. Saxon, M. Schioppa,S. Schlenstedt, P. Schleper,W. B. Schmidke,U. Schneekloth,V. Schönberg, T. Schörner-Sadenius, J. Schwartz, F. Sciulli,L. M. Shcheglova, R. Shehzadi, S. Shimizu,I. Singh, I. O. Skillicorn,W. Slominski,W. H. Smith,V. Sola, A. Solano,D. Son,V. Sosnovtsev, A. Spiridonov, H. Stadie, L. Stanco, N. Stefaniuk, A. Stern,T. P. Stewart,A. Stifutkin,P. Stopa,S. Suchkov,G. Susinno, L. Suszycki, J. Sztuk-Dambietz,D. Szuba,J. Szuba,A. D. Tapper,E. Tassi, J. Terrón,T. Theedt, H. Tiecke,K. Tokushuku,J. Tomaszewska, V. Trusov,T. Tsurugai,M. Turcato,O. Turkot,T. Tymieniecka,M. Vázquez, A. Verbytskyi,O. Viazlo, N. N. Vlasov,R. Walczak,W. A. T. Wan Abdullah, J. J. Whitmore,K. Wichmann,L. Wiggers,M. Wing, M. Wlasenko,G. Wolf, H. Wolfe, K. Wrona, A. G. Yagües-Molina, S. Yamada,Y. Yamazaki,R. Yoshida, C. Youngman, O. Zabiegalov,A. F. Żarnecki,L. Zawiejski, O. Zenaiev, W. Zeuner,B. O. Zhautykov, N. Zhmak, A. Zichichi,Z. Zolkapli, D. S. Zotkin

Journal of High Energy Physics(2013)

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摘要
bstract The cross sections for inelastic photoproduction of J/ψ and ψ ′ mesons have been measured in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 468 pb −1 collected in the period 1996–2007. The ψ ′ to J/ ψ cross section ratio was measured in the range 0 . 55 < z < 0 . 9 and 60 < W < 190 GeV as a function of W , z and p T . Here W denotes the photon-proton centre-of-mass energy, z is the fraction of the incident photon energy carried by the meson and p T is the transverse momentum of the meson with respect to the beam axis. The J/ψ cross sections were measured for 0 . 1 < z < 0 . 9, 60 < W < 240 GeV and p T > 1 GeV. Theoretical predictions within the non-relativistic QCD framework including NLO colour-singlet and colour-octet contributions were compared to the data, as were predictions based on the k T -factorisation approach.
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Lepton-Nucleon Scattering, QCD
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