Photoproduction of heavy quarkonia

Abstract

Abstract. We investigate the reaction γp → V p, with V denoting a Φ or a J/Ψ meson, within the scope of perturbative QCD, treating the proton as a quark-diquark system. Our predictions extrapolate the existing forward differential cross-section data into the few-GeV momentum-transfer region. In case of the J/Ψ reasonable results are only obtained by properly taking into account its mass in the perturbative calculation of the hard-scattering amplitude.