Abstract submitted to the
         XXXth International Conference on High Energy Physics
                July 27 - August 2, 2000, Osaka, Japan
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 Proton-dissociative diffractive photoproduction of vector mesons
                                at large |t| at HERA

                               ZEUS Collaboration





                                    Abstract


Photoproduction of vector mesons, e+ p --> e+ V N, where N is either
the proton or a low-mass dissociated state, has been measured in e^+p
interactions with the ZEUS detector at HERA using an integrated
luminosity of 24.3 pb^-1. The data were taken at a photon-proton
centre-of-mass energy W = 100 GeV and extend up to |t|=12 GeV2, where
t is the square of the four-momentum transferred to V.  The
differential cross section, dsigma/dt, and the results of a
decay-angle analysis as a function of t for rho, phi and J/psi
production are compared to expectations from phenomenological models.