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.
Exclusive $J/\psi$ production at the LHC in the $k_T$ factorization approach
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abstract
The recent LHCb data for exclusive $J/\psi$ peripheral production at 13 TeV motivate an improved `NLO' analysis to estimate the gluon distribution at low $x$ in which we re-calculate the rapidity gap survival factors and use a more precise expression for the photon flux. We comment on the difference between the $k_T$ and collinear factorization approaches.
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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.