The exclusive J/ψ process at the LHC tamed to probe the low x gluon

Jones, S.P.; Martin, A.D.; Ryskin, M.G.; Teubner, T.

Abstract

The perturbative QCD expansion for J/ψ photoproduction appears to be unstable: the NLO correction is large (and of opposite sign) to the LO contribution. Moreover, the predictions are very sensitive to the choice of factorisation and renormalisation scales. Here we show that perturbative stability is greatly improved by imposing a ‘Q0 cut’ on the NLO coefficient functions; a cut which is required to avoid double counting. Q0 is the input scale used in the parton DGLAP evolution. This result opens the possibility of high precision exclusive J/ψ data in the forward direction at the LHC being able to determine the low x gluon distribution at low scales.

Citation

Jones, S., Martin, A., Ryskin, M., & Teubner, T. (2016). The exclusive J/ψ process at the LHC tamed to probe the low x gluon. The European Physical Journal C, 76(11), Article 633. https://doi.org/10.1140/epjc/s10052-016-4493-y

• Journal Article Type: Article
• Acceptance Date: Nov 6, 2016
• Online Publication Date: Nov 21, 2016
• Publication Date: Nov 21, 2016
• Deposit Date: May 25, 2017
• Publicly Available Date: May 31, 2017
• Journal: European Physical Journal C: Particles and Fields
• Print ISSN: 1434-6044
• Electronic ISSN: 1434-6052
• Publisher: SpringerOpen
• Peer Reviewed: Peer Reviewed
• Volume: 76
• Issue: 11
• Article Number: 633
• DOI: https://doi.org/10.1140/epjc/s10052-016-4493-y
• Public URL: https://durham-repository.worktribe.com/output/1378283