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  • Measurement of inelastic J/...
    Abramowicz, H.; Adamczyk, L.; Antonelli, S.; Antonov, A.; Bachynska, O.; Bamberger, A.; Bartsch, D.; Bindi, M.; Blohm, C.; Bold, T.; Bondarenko, K.; Brümmer, N.; Bruni, G.; Bussey, P. J.; Chekanov, S.; Ciesielski, R.; Contin, A.; Cooper-Sarkar, A. M.; D’Agostini, G.; del Peso, J.; De Pasquale, S.; Derrick, M.; Dolinska, G.; Dusini, S.; Eisenberg, Y.; Foster, B.; Gach, G.; Gladilin, L. K.; Gladkov, D.; Golubkov, Yu. A.; Grabowska-Bold, I.; Grebenyuk, J.; Grigorescu, G.; Grzelak, G.; Gwenlan, C.; Hamatsu, R.; Hartner, G.; Iga, Y.; Ishitsuka, M.; Januschek, F.; Kahle, B.; Katkov, I. I.; Kaur, M.; Kisielewska, D.; Kondrashova, N.; Korzhavina, I. A.; Kotanski, A.; Kuprash, O.; Kuze, M.; Libov, V.; Limentani, S.; Ling, T. Y.; Lohmann, W.; Lontkovskyi, D.; Maeda, J.; Melzer-Pellmann, I.-A.; Mergelmeyer, S.; Miglioranzi, S.; Mohamad Idris, F.; Monaco, V.; Morris, J. D.; Nobe, T.; Notz, D.; Oh, B. Y.; Okazaki, N.; Onishchuk, Yu; Parenti, A.; Pawlak, J. M.; Pellegrino, A.; Perrey, H.; Piotrzkowski, K.; Raval, A.; Reeder, D. D.; Reisert, B.; Ren, Z.; Robertson, A.; Rubinsky, I.; Ruspa, M.; Samson, U.; Saxon, D. H.; Schwartz, J.; Shimizu, S.; Singh, I.; Sola, V.; Solano, A.; Son, D.; Stopa, P.; Suchkov, S.; Suszycki, L.; Szuba, D.; Tokushuku, K.; Trusov, V.; Turkot, O.; Verbytskyi, A.; Yamazaki, Y.; Youngman, C.; Żarnecki, A. F.; Zhautykov, B. O.; Zichichi, A.; Zotkin, D. S.

    The journal of high energy physics, 02/2013, Volume: 2013, Issue: 2
    Journal Article

    A 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.