Probing the Low x Gluon with Exclusive J/ψ Production



Jones, SP, Martin, AD, Ryskin, MG and Teubner, T ORCID: 0000-0002-0680-0776
(2018) Probing the Low x Gluon with Exclusive J/ψ Production. .

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Abstract

© 2017 Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0). We present an updated and improved extraction of the low-x gluon distribution from the HERA and LHCb exclusive J/ψ production data in the context of kT factorisation. Critically, we use a more precise expression for the photon flux and updated rapidity gap survival factors. In collinear factorisation, exclusive J/ψ 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.

Item Type: Conference or Workshop Item (Unspecified)
Depositing User: Symplectic Admin
Date Deposited: 25 Jul 2018 06:52
Last Modified: 28 Jul 2021 09:32
Open Access URL: https://pos.sissa.it/297/032
URI: https://livrepository.liverpool.ac.uk/id/eprint/3024128