Measurement of J/ψ production cross-sections in pp collisions at √s = 5 TeV

LHCb collaboration, L. Xu*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The production cross-sections of J/ψ mesons in proton-proton collisions at a centre-of-mass energy of s = 5 TeV are measured using a data sample corresponding to an integrated luminosity of 9.13 ± 0.18 pb −1, collected by the LHCb experiment. The cross-sections are measured differentially as a function of transverse momentum, p T, and rapidity, y, and separately for J/ψ mesons produced promptly and from beauty hadron decays (nonprompt). With the assumption of unpolarised J/ψ mesons, the production cross-sections integrated over the kinematic range 0 < p T< 20 GeV/c and 2.0 < y < 4.5 areσpromptJ/ψ=8.154±0.010±0.283μb,σnonpromptJ/ψ=0.820±0.003±0.034μb, where the first uncertainties are statistical and the second systematic. These cross-sections are compared with those at s = 8 TeV and 13 TeV, and are used to update the measurement of the nuclear modification factor in proton-lead collisions for J/ψ mesons at a centre-of-mass energy per nucleon pair of sNN = 5 TeV. The results are compared with theoretical predictions. [Figure not available: see fulltext.].

Original languageEnglish
Article number181
Number of pages32
JournalJournal of High Energy Physics
Volume2021
Issue number11
DOIs
Publication statusPublished - 24 Nov 2021

Keywords

  • Hadron-Hadron scattering (experiments)
  • Heavy quark production
  • QCD
  • Quarkonium
  • HADRONIC PRODUCTION
  • J-PSI

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