Measurement of diffractive photoproduction of Upsilon with ZEUS at HERA

Diffractive photoproduction of Upsilon was measured using events with 
mu+mu- in the final state with the ZEUS detector at HERA using an 
integrated luminosity of 470 pb-1. The gamma p cross section for 
Upsilon production is presented as a function of the photon proton 
centre-of-mass energy, W, in the range 60 < W < 220 GeV.