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Measurements of inelastic J/psi and psi' photoproduction at HERA
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The cross sections for inelastic photoproduction of J/psi and psi' mesons have been measured in ep collisions with the ZEUS detector at HERA, using an integrated luminosity of 38.0 pb-1. The events were required to have 0.1 < z < 0.9 and 50 < W < 180 GeV, where z is the fraction of the incident photon energy carried by the J/psi in the proton rest frame and W is the photon-proton centre-of-mass energy. The psi' to J/psi cross-section ratio was measured in the range 0.55 < z < 0.9. The J/psi data, for various ranges of transverse momentum, are compared to theoretical models incorporating colour-singlet and colour-octet matrix elements. Predictions of a next-to-leading-order colour-singlet model give a good description of the data, although there is a large normalisation uncertainty. The J/psi helicity distribution for z > 0.4 is compared to leading-order QCD predictions.
Forward citations
Cited by 1 Pith paper
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Sivers Asymmetry in Photoproduction of $J/\psi$ and Jet at the EIC
Photoproduction of J/psi+jet at the EIC shows a gluon-dominated Sivers asymmetry of up to 6-8% in the models studied, making it a promising probe of the gluon Sivers function.
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