Abstract
Results on the elastic and inelastic photo-production of J /Ψ from ep interactions at HERA are presented. The elastic cross section is observed to increase with W more rapidly than expected by Regge models, but is reproduced by QCD models sensitive to the gluon density of the proton. The inelastic cross section is consistent with NLO QCD calculations of photon-gluon fusion. Photo-production of Ψ(2 s ) is also presented.
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