Exclusive Photoproduction at HERA

Abstract

The exclusive ϒ photoproduction, γ p → ϒp, has been studied with the ZEUS experiment in ep collisions at HERA using an integrated luminosity of 468 pb −1. The measurement covers the kinematic range 60 < W < 220 GeV and Q 2 < 1 GeV 2 , where W is the photon-proton centre-ofmass energy and Q 2 is the photon virtuality. These results, which represent the analysis of the full ZEUS data sample for this channel, are compared to predictions based on perturbative QCD. The * Speaker. † on behalf of the ZEUS and H1 Collaborations