Elastic J/Psi Production at HERA

Abstract

Cross sections for elastic production of J/Psi mesons in photoproduction and electroproduction are measured in electron proton collisions at HERA using an integrated luminosity of 55 pb^{-1}. Results are presented for photon virtualities Q^2 up to 80 GeV^2. The dependence on the photon-proton centre of mass energy W_{gamma p} is analysed in the range 40 < \Wgp < 305 GeV in photoproduction and 40 < \Wgp < 160 GeV in electroproduction. The \Wgp dependences of the cross sections do not change significantly with Q^2 and can be described by models based on perturbative QCD. Within such models, the data show a high sensitivity to the gluon density of the proton in the domain of low Bjorken x and low Q^2. Differential cross sections dσ/dt, where t is the squared four-momentum transfer at the proton vertex, are measured in the range |t|<1.2 GeV^2 as functions of \Wgp and Q^2. Effective Pomeron trajectories are determined for photoproduction and electroproduction. The J/Psi production and decay angular distributions are consistent with s-channel helicity conservation. The ratio of the cross sections for longitudinally and transversely polarised photons is measured as a function of Q^2 and is found to be described by perturbative QCD based models.

40 pages, 14 figures, 15 tables

References in corpus (7)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
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• Exclusive electroproduction of J/psi mesons at HERA
• Diffractive Vector Meson Production at HERA: from Soft to Hard QCD
• Exclusive photoproduction of a heavy vector meson in QCD
• Diffractive Photoproduction of J/psi Mesons with Large Momentum Transfer at HERA
• Measurement of the Proton Structure Function F_2 at low Q^2 in QED Compton Scattering at HERA

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