Elastic Photoproduction of J/psi and Upsilon Mesons at HERA

Details Elastic Photoproduction of J/psi and Upsilon Mesons at HERA Elastic Photoproduction of J/psi and Upsilon Mesons at HERA

2000-03-16

arxiv.org/abs/hep-ex/0003020v1

Phys.Lett.B483:23-35,2000

Physics

High Energy Physics

High Energy Physics - Experiment

18 pages, 6 figures and 3 tables

Scientific paper

10.1016/S0370-2693(00)00530-X

Cross sections for elastic photoproduction of J/Psi and Upsilon mesons are presented. For J/Psi mesons the dependence on the photon-proton centre-of-mass energy W_gammap is analysed in an extended range with respect to previous measurements of 26<=W_gammap<= 285 GeV. The measured energy dependence is parameterized as sigma_gammap proportional W_gammap^delta with delta=0.83+-0.07. The differential cross section dsigma/dt for J/Psi mesons is derived, its dependence on W_gammap and on t is analysed and the effective trajectory (in terms of Regge theory) is determined to be alpha(t)=(1.27+-0.05)+(0.08+-0.17)*t/GeV^2. Models based on perturbative QCD and on pomeron exchange are compared to the data.

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