J/\psi photoproduction at HERA with ZEUS

In this article, the status of J/\psi photoproduction at HERA using the ZEUS detector is summarized. The J/\psi mesons were identified through their decay into muon pairs. 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, W, and of the squared four-momentum transfer at the proton vertex, |t|. The results are compared to perturbative QCD calculations. The double differential inelastic J/\psi photoproduction cross section as function of the squared transverse momentum of the J/\psi, p^2_t, in bins of the inelasticity z has been measured. An integrated luminosity of 468 pb^{-1} was used corresponding to the full data sample collected by the ZEUS experiment. The events were required to have 0.1 < z <$0.9, p_t > 1 GeV and 60 < W < 240 GeV. The double differential cross section measurements are compared to the most recent theoretical predictions.