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

H. Abramowicz, Iris Abt, L. Adamczyk, M. Adamus, Ritu Aggarwal, S. Antonelli, P. Antonioli, А. Антонов, M. Arneodo, O. Arslan

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V. Aushev, Y. Aushev, O. Bachynska, A. Bamberger, A.N. Barakbaev, G. Barbagli, Giacomo Bari, Fernando 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. Bołd, Kyrylo Bondarenko, E. Boos, K. Borras, D. Boscherini, D. Bot, Ian C. Brock, E. Brownson, R. Brugnera, N.C. Brümmer, A. Bruni, G. Bruni, B. Brzozowska, Peter John Bussey, Ben Bylsma, A. Caldwell, M. Capua, R. Carlin, C. D. Catterall, Sergei V. Chekanov, J. 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, Malcolm Derrick, R.C.E. Devenish, D. Dobur, B. A. Dolgoshein, Ganna Dolinska, A. T. Doyle, V. Drugakov, L. S. Durkin, S. Dusini, Yael Eisenberg, P. Ermolov, A. Eskreys, S. Fang, Salvatore Fazio, J. Ferrando, M.I. Ferrero, J. Figiel, B. Foster, G. P. Gach, A. Galas, E. Gallo, A. Garfagnini, A. Geiser, I. Gialas, A. Gizhko, L. K. Gladilin, D. Gladkov, Claudia Glasman, O. Gogota, Yu. A. Golubkov, P. Göttlicher, I. Grabowska-Bołd, J. Grebenyuk, I. M. Gregor

Journal of High Energy Physics, 2013

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DOI 10.1007/jhep02(2013)071
Data confidence 70 medium
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Abstract

Abstract The cross sections for inelastic photoproduction ofJ/ψandψ′ mesons have been measured inepcollisions with the ZEUS detector at HERA, using an integrated luminosity of 468 pb−1collected in the period 1996–2007. Theψ′ toJ/ψ cross section ratio was measured in the range 0.55 < z < 0.9 and 60 < W < 190 GeV as a function ofW,zandpT. HereWdenotes the photon-proton centre-of-mass energy,zis the fraction of the incident photon energy carried by the meson andpTis the transverse momentum of the meson with respect to the beam axis. TheJ/ψcross sections were measured for 0.1 < z < 0.9, 60 < W < 240 GeV andpT > 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 thekT-factorisation approach.