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  • Abt, I; Adamus, M; Antonov, A; Aushev, V; Aushev, Y; Bachynska, O; Bartsch, D; Bold, T; Boscherini, D; Brümmer, N; Capua, M; Catterall, C D; Chekanov, S; Contin, A; Cooper-sarkar, A M; Costa, M; De Pasquale, S; Dolgoshein, B A; Ermolov, P F; Fang, S; Ferrando, J; Figiel, J; Galas, A; Gallo, E; Gizhko, A; Göttlicher, P; Grebenyuk, J; Gregor, I; Gueta, O; Gwenlan, C; Hain, W; Hochman, D; Hori, R; Hüttmann, A; Iga, Y; Ishitsuka, M; Kadenko, I; Kahle, B; Kanno, T; Karshon, U; Karstens, F; Katkov, I I; Khein, L A; Kim, J Y; Kisielewska, D; Klanner, R; Klein, U; Kondrashova, N; Kononenko, O; Korol, Ie; Kotanski, A; Kötz, U; Lohrmann, E; Longhin, A; Malka, J; Mankel, R; Martin, J F; Montanari, A; Morris, J D; Nania, R; Nigro, A; Oh, B Y; Okazaki, N; Papageorgiu, K; Parenti, A; Paul, E; Pelfer, P G; Perlanski, W; Perrey, H; Piotrzkowski, K; Plucinski, P; Pokrovskiy, N S; Proskuryakov, A S; Przybycien, M; Ren, Z; Ruspa, M; Saxon, D H; Schioppa, M; Schleper, P; Sciulli, F; Shimizu, S; Slominski, W; Son, D; Spiridonov, A; Stadie, H; Stanco, L; Suchkov, S; Suszycki, L; Szuba, D; Szuba, J; Tassi, E; Tymieniecka, T; Vlasov, N N; Walczak, R; Wiggers, L; Wlasenko, M; Wrona, K; Arnecki, A F; Zawiejski, L; Zotkin, D S

    The journal of high energy physics, 02/2013, Letnik: 2013, Številka: 2
    Journal Article

    The cross sections for inelastic photoproduction of J/psi and psi' mesons have been measured in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 468 pb^sup -1^ collected in the period 1996-2007. The psi' to J/psi 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 ^sub 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 ^sub T^ is the transverse momentum of the meson with respect to the beam axis. The J/psi cross sections were measured for 0.1<z<0.9, 60<W<240 GeV and p ^sub 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 ^sub T^-factorisation approach.