Measurement of proton-dissociative diffractive photoproduction of vector mesons at large momentum transfer at HERA

Details Measurement of proton-dissociative diffractive photoproduction of vector mesons at large momentum transfer at HERA Measurement of proton-dissociative diffractive photoproduction of vector mesons at large momentum transfer at HERA

2002-05-23

arxiv.org/abs/hep-ex/0205081v1

Eur.Phys.J.C26:389-409,2003

Physics

High Energy Physics

High Energy Physics - Experiment

44 pages, 17 figures, to be submitted to The European Physical Journal

Scientific paper

10.1140/epjc/s2002-01079-0

Diffractive photoproduction of vector mesons, gamma p --> V Y, where Y is a proton-dissociative system, has been measured in ep interactions with the ZEUS detector at HERA using an integrated luminosity of 25 pb^-1. The differential cross section, ds/dt, is presented for -t<12 GeV^2, where t is the square of the four-momentum transferred to the vector meson. The data span the range in photon-proton centre-of-mass energy, W, from 80 GeV to 120 GeV. The t distributions are well fit by a power law, ds/dt ~ (-t)^{-n}. The slope of the Pomeron trajectory, measured from the W dependence of the rho^0 and phi cross sections in bins of t, is consistent with zero. The ratios ds_(gamma p --> phi Y)/dt to ds_(gamma p --> rho^0 Y)/dt and ds_(gamma p --> J/psi Y)/dt to ds_(gamma p --> rho^0 Y)/dt increase with increasing -t. Decay-angle analyses for rho^0, phi and J/psi mesons have been carried out. For the rho^0 and phi mesons, contributions from single and double helicity flip are observed. The results are compared to expectations of theoretical models.

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