Abstract submitted to the
         XXXth International Conference on High Energy Physics
                July 27 - August 2, 2000, Osaka, Japan
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         Measurement of inclusive prompt photon photoproduction at HERA

                    
                               ZEUS Collaboration





                                    Abstract


  First inclusive measurements of isolated prompt photons in
photoproduction at the HERA ep collider have been made with the ZEUS
detector, using an integrated luminosity of 38.4 pb^-1. Cross sections
are given as a function of the pseudorapidity and the transverse
energy (\eta^gamma, \E_t^gamma) of the photon, for E_T^gamma > 5 GeV
in the gamma p centre-of-mass energy range 134-285 GeV.  Comparisons
are made with predictions from Monte Carlo models.  For forward
eta^gamma (proton direction) good agreement is found, but in the rear
direction all predictions fall below the data.