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- W1983077725 abstract "The cross sections for inelastic photoproduction of $J/psi$ and $psi^{prime}$ 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 $psi^{prime}$ 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." @default.
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- W1983077725 date "2003-03-01" @default.
- W1983077725 modified "2023-09-26" @default.
- W1983077725 title "Measurements of inelastic $J/psi$ and $psi^{prime}$ photoproduction at HERA" @default.
- W1983077725 doi "https://doi.org/10.1140/epjc/s2002-01130-2" @default.
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