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

LHCb collaboration, L. Xu*

*Corresponding author for this work

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The production cross-sections of J/psi mesons in proton-proton collisions at a centre-of-mass energy of root s = 5TeV 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/psi mesons produced promptly and from beauty hadron decays (nonprompt). With the assumption of unpolarised J/psi mesons, the production cross-sections integrated over the kinematic range 0 < p(T) < 20 GeV/c and 2.0 < y < 4.5 aresigma(prompt) J/psi = 8.154 +/- 0.010 +/- 0.283 mu b,sigma(nonprompt) J/psi = 0.820 +/- 0.003 +/- 0.034 mu b,where the first uncertainties are statistical and the second systematic. These cross-sections are compared with those at root s = 8TeV and 13TeV, and are used to update the measurement of the nuclear modification factor in proton-lead collisions for J/psi mesons at a centre-of-mass energy per nucleon pair of root s(NN) = 5TeV. The results are compared with theoretical predictions.
Original languageEnglish
Article number181
Number of pages32
JournalJournal of High Energy Physics
Issue number11
Publication statusPublished - 24 Nov 2021


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

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