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

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

doi:10.1103/physrevd.102.114021

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

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

Authors

C. A. Flett

A. D. Martin

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

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