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

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

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