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Article
Report number arXiv:2006.13857 ; IPPP/20/23 ; LTH 1237
Title Very low x gluon density determined by LHCb exclusive J/ψ data
Author(s) Flett, C.A. (Liverpool U., Dept. Math.) ; Martin, A.D. (Durham U., IPPP ; St. Petersburg, INP) ; Ryskin, M.G. (Durham U., IPPP ; St. Petersburg, INP) ; Teubner, T. (Liverpool U., Dept. Math.)
Publication 2020-12-11
Imprint 2020-06-24
Number of pages 18
In: Phys. Rev. D 102 (2020) 114021
DOI 10.1103/PhysRevD.102.114021
Subject category hep-ph ; Particle Physics - Phenomenology
Accelerator/Facility, Experiment CERN LHC ; LHCb
Abstract The low x behaviour of the gluon density xg(x,μ2) at scale μ2=2.4 GeV2 is determined using exclusive J/ψ production data from HERA and LHCb within the framework of collinear factorisation at next-to-leading order (NLO). It is shown that in the interval 3×106<x<103 the gluon distribution function grows as xg(x,μ2)xλ 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.
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 Record created 2020-07-16, last modified 2022-10-21


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