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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.

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Authors

S.P. Jones

A.D. Martin

M.G. Ryskin

T. Teubner



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 Mar 28, 2024
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

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
© The Author(s) 2016 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Funded by SCOAP3





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