Elastic Photoproduction of J/psi and Upsilon Mesons at HERA
H1 Collaboration, C. Adloff
Abstract
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 Wgammap is analysed in an extended range with respect to previous measurements of 26<=Wgammap<= 285 GeV. The measured energy dependence is parameterized as sigmagammap proportional Wgammapdelta with delta=0.83+-0.07. The differential cross section dsigma/dt for J/Psi mesons is derived, its dependence on Wgammap 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/GeV2. Models based on perturbative QCD and on pomeron exchange are compared to the data.
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