Diffractive $J/ψ$ photoproduction as a probe of the gluon density

Details Diffractive $J/ψ$ photoproduction as a probe of the gluon density Diffractive $J/ψ$ photoproduction as a probe of the gluon density

1995-11-03

arxiv.org/abs/hep-ph/9511228v2

Z.Phys. C76 (1997) 231-239

Physics

High Energy Physics

High Energy Physics - Phenomenology

Formulas for Fermi motion are corrected. Numerical results are unchanged

Scientific paper

We use perturbative QCD, beyond the leading $\ln Q^2$ approximation, to show how measurements of diffractive $J/\psi$ production at HERA can provide a sensitive probe of the gluon density of the proton at small values of Bjorken $x$. We estimate both the effect of the relativistic motion of the $c$ and $\overline{c}$ within the $J/\psi$ and of the rescattering of the $c\overline{c}$ quark pair on the proton. We find that the available data for diffractive $J/\psi$ photoproduction can discriminate between the gluon distributions of the most recent sets of partons.

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