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 3×10−6<x<10−3 the gluon distribution function grows as xg(x,μ2)∝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. |
Copyright/License
| publication: (License: CC-BY-4.0), sponsored by SCOAP³ preprint: (License: CC-BY-4.0) |