Measurement of J/ψ photoproduction at large momentum transfer at HERA

Abstract

The proton-dissociative diffractive photoproduction of J/ 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-ofmass energy and of the squared four-momentum transfer at the proton vertex. The results are compared to perturbative QCD calculations.