Abstract
We use perturbative QCD, beyond the leading lnQ 2 approximation, to show how measurements of diffractive J/ψ 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 \(\bar c\) within the J/ψ and of the rescattering of the \(c\bar c\) quark pair on the proton. We find that the available data for diffractive J/ψ photoproduction can discriminate between the gluon distributions of the most recent sets of partons.
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Ryskin, M.G., Roberts, R.G., Martin, A.D. et al. Diffractive J/ψ photoproduction as a probe of the gluon density. Z Phys C - Particles and Fields 76, 231–239 (1997). https://doi.org/10.1007/s002880050547
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DOI: https://doi.org/10.1007/s002880050547