We present an updated and improved extraction of the low-$x$ gluon distribution from the HERA and LHCb exclusive $J/\psi$ production data in the context of $k_T$ factorisation. Critically, we use a more precise expression for the photon flux and updated rapidity gap survival factors.
In collinear factorisation, exclusive $J/\psi$ photoproduction receives large perturbative corrections at next-to-leading order which depend sensitively on the factorisation scale. This prevents the use of the available data to extract a gluon PDF within this framework. Attempts to understand and overcome the problems caused by the large perturbative corrections are discussed.
Volume 297 -
XXV International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2017) -
WG1 and WG5 joint session
Probing the Low x Gluon with Exclusive $J/\psi$ Production
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Pre-published on:
October 21, 2017
Published on:
January 16, 2018
Abstract
DOI: https://doi.org/10.22323/1.297.0032
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.