Diffractive Photoproduction of J/psi mesons with large momentum transfer 
                           at HERA

	             ZEUS Collaboration

	                 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.