Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-04-07
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, LaTeX; figures are included via epsfig; the corresponding postscript files are uuencoded
Scientific paper
Inelastic photoproduction of $J/\psi$ particles at high energies is one of the processes to determine the gluon distribution in the nucleon. The QCD radiative corrections to the color-singlet model of this reaction have recently been calculated. They are large at moderate photon energies, but decrease with increasing energies. I compare the cross section and the ${J/\psi}$ energy spectrum with the available fixed-target photoproduction data. Predictions for the HERA energy range are given which demonstrate the sensitivity of the result to the parametrization of the gluon distribution in the small-$x$ region. (Talk presented at the Workshop on "Heavy Quark Physics", Bad Honnef, FRG, Dec. 1994)
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