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Diffractive $J/\psi$ photoproduction as a probe of the gluon density
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abstract
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.
Forward citations
Cited by 2 Pith papers
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Diffractive Production of Heavy Quarkonia at the Electron Ion Collider
Keeping the full gluon transverse momentum in diffractive quarkonium production matches HERA psi(2S)/J/psi ratios better than the standard dipole limit and yields new EIC Upsilon-ratio predictions.
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How to include exclusive $J/\psi$ production data in global PDF analyses
Exclusive J/psi photoproduction at HERA is consistent with global PDFs at NLO when the optimal scale and a Q0 subtraction are used, enabling low-x gluon extraction.
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