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We present a measurement of the inelastic, non diffractive J/psi photoproduction cross section in the reaction e(+)p --> e(+)J/psi X with the ZEUS detector at HERA, The J/psi was identified using both the mu(+)mu(-) and e(+)e(-) decay channels and events were selected within the range 0.4 < z < 0.9 (0.5 < z < 0.9) for the muon (electron) decay mode, where z is the fraction of the photon energy carried by the J/psi in the proton rest frame. The cross section, the p(T)(2) and the z distributions, after having subtracted the contributions from resolved photon and diffractive proton dissociative processes, are given for the photon-proton centre of mass energy range 50 < W < 180 GeV; p(T)(2) is the square of the J/psi transverse momentum with respect to the incoming proton beam direction. In the kinematic range 0.4 < z < 0.9 and p(T)2 > 1 GeV(2), NLO calculations of the photon-gluon fusion process based on the colour-singlet model are in good agreement with the data, The predictions of a specific leading order colour-octet. model, as formulated to describe the CDP data on J/psi hadroproduction, are not consistent with the data. RI De Pasquale, Salvatore/B-9165-2008; Lancaster, Mark/C-1693-2008; Bashkirov, Vladimir/A-4818-2008; Doyle, Anthony/C-5889-2009; Gladilin, Leonid/B-5226-2011; Golubkov, Yury/E-1643-2012

We present a measurement of the inelastic, non diffractive J/psi photoproduction cross section in the reaction e(+)p --> e(+)J/psi X with the ZEUS detector at HERA, The J/psi was identified using both the mu(+)mu(-) and e(+)e(-) decay channels and events were selected within the range 0.4 < z < 0.9 (0.5 < z < 0.9) for the muon (electron) decay mode, where z is the fraction of the photon energy carried by the J/psi in the proton rest frame. The cross section, the p(T)(2) and the z distributions, after having subtracted the contributions from resolved photon and diffractive proton dissociative processes, are given for the photon-proton centre of mass energy range 50 < W < 180 GeV; p(T)(2) is the square of the J/psi transverse momentum with respect to the incoming proton beam direction. In the kinematic range 0.4 < z < 0.9 and p(T)2 > 1 GeV(2), NLO calculations of the photon-gluon fusion process based on the colour-singlet model are in good agreement with the data, The predictions of a specific leading order colour-octet. model, as formulated to describe the CDP data on J/psi hadroproduction, are not consistent with the data.

Measurement of inelastic J/psi photoproduction at HERA / Breitweg, J; Derrick, M; Krakauer, D; Magill, S; Mikunas, D; Musgrave, B; Repond, J; Stanek, R; Talaga, Rl; Yoshida, R; Zhang, H; Mattingly, Mck; Anselmo, F; Antonioli, P; Bari, G; Basile, M; Bellagamba, L; Boscherini, D; Bruni, A; Bruni, G; Romeo, Gc; Castellini, G; Cifarelli, L; Cindolo, F; Contin, A; Corradi, M; De Pasquale, S; Gialas, I; Giusti, P; Iacobucci, G; Laurenti, G; Levi, G; Margotti, A; Massam, T; Nania, R; Palmonari, F; Pesci, A; Polini, A; Ricci, F; Sartorelli, G; Garcia, Yz; Zichichi, A; Amelung, C; Bornheim, A; Brock, I; Coboken, K; Crittenden, J; Deffner, R; Eckert, M; Grothe, M; Hartmann, H; Heinloth, K; Heinz, L; Hilger, E; Jakob, Hp; Katz, Uf; Kerger, R; Paul, E; Pfeiffer, M; Rembser, C; Stamm, J; Wedemeyer, R; Wieber, H; Bailey, Ds; Campbell Robson, S; Cottingham, Wn; Foster, B; Hall Wilton, R; Hayes, Me; Heath, Gp; Heath, Hf; Piccioni, D; Roff, Dg; Tapper, Rj; Ameodo, M; Ayad, R; Capua, Marcella; Garfagnini, A; 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