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Very low x gluon density determined by LHCb exclusive J/ψ data

Flett, C. A.; Martin, A. D.; Ryskin, M. G.; Teubner, T.

Very low x gluon density determined by LHCb exclusive J/ψ data Thumbnail


Authors

C. A. Flett

M. G. Ryskin

T. Teubner



Abstract

The low x behavior of the gluon density x g ( x , μ 2 ) at scale μ 2 = 2.4     GeV 2 is determined using exclusive J / ψ production data from HERA and LHCb within the framework of collinear factorization at next-to-leading order (NLO). It is shown that in the interval 3 × 10 − 6 < x < 10 − 3 the gluon distribution function grows as x g ( x , μ 2 ) ∝ x − λ with λ = 0.135 ± 0.006 . The impact this experimental data will have for the global parton distribution function (PDF) analyses in this low x domain is quantified. No indication in favour of parton density saturation is observed.

Citation

Flett, C., Martin, A., Ryskin, M., & Teubner, T. (2020). Very low x gluon density determined by LHCb exclusive J/ψ data. Physical Review D, 102(11), Article 114021. https://doi.org/10.1103/physrevd.102.114021

Journal Article Type Article
Acceptance Date Nov 17, 2020
Online Publication Date Dec 11, 2020
Publication Date 2020-12
Deposit Date Sep 9, 2021
Publicly Available Date Sep 10, 2021
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 102
Issue 11
Article Number 114021
DOI https://doi.org/10.1103/physrevd.102.114021
Public URL https://durham-repository.worktribe.com/output/1235266

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

Copyright Statement
Advance online version Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP






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