Measurement of J/Psi photoproduction at large |t| with ZEUS at HERA

The proton-dissociative diffractive photoproduction of J/psi mesons was
measured with the ZEUS detector at HERA using an integrated luminosity 
of 112 pb^{-1}. The cross section was measured as a function of the 
centre-of-mass energy of the photon-proton system and of the squared 
four-momentum transfer at the proton vertex. The results are compared 
to perturbative QCD calculations based on BFKL and DGLAP evolution equations.