2000 character limit reached
Measurement of J/psi photoproduction at large momentum transfer at HERA (0910.1235v2)
Published 7 Oct 2009 in hep-ex
Abstract: The proton-dissociative diffractive photoproduction of J/psi mesons has been studied in ep collisions with the ZEUS detector at HERA using an integrated luminosity of 112 pb-1. The cross section is presented as a function of the photon-proton centre-of-mass energy and of the squared four-momentum transfer at the proton vertex. The results are compared to perturbative QCD calculations.