DIFFRACTIVE PHOTOPRODUCTION OF p AND AT LARGE i

摘要

New measurement of diffractive photoproduction of p and 4> mesons at HERA is reported. Using ZEUS tagged photoproduction data in a 105 > Wlp > 85 GeV, > 1 GeV2 range thet distributions were measured and the ratio of cross-sections, p), was found to be close to a quark-model prediction of 2/9.