Measurement of quarkonium production in proton–lead and proton–proton collisions at 5.02 TeV5.02~\mathrm {TeV} with the ATLAS detector

Collaboration
Sep 10, 2017
32 pages
Published in:
  • Eur.Phys.J.C 78 (2018) 3, 171
  • Published: Feb 28, 2018
e-Print:
Report number:
  • CERN-EP-2017-197,
  • CERN-PH-EP-2017-197
Experiments:

Citations per year

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Abstract: (Springer)
The modification of the production of J/ψJ/\psi , ψ(2S)\psi (2\mathrm {S}) , and Υ(nS)\varUpsilon (n\mathrm {S}) ( n=1,2,3n = 1, 2, 3 ) in p+Pb collisions with respect to their production in pp collisions has been studied. The p+Pb and pp datasets used in this paper correspond to integrated luminosities of 28 nb128~\mathrm {nb}^{-1} and 25 pb125~\mathrm {pb}^{-1} respectively, collected in 2013 and 2015 by the ATLAS detector at the LHC, both at a centre-of-mass energy per nucleon pair of 5.02 TeV. The quarkonium states are reconstructed in the dimuon decay channel. The yields of J/ψJ/\psi and ψ(2S)\psi (\mathrm {2S}) are separated into prompt and non-prompt sources. The measured quarkonium differential cross sections are presented as a function of rapidity and transverse momentum, as is the nuclear modification factor, RpPbR_{p\mathrm {Pb}} for J/ψJ/\psi and Υ(nS)\varUpsilon (n\mathrm {S}) . No significant modification of the J/ψJ/\psi production is observed while Υ(nS)\varUpsilon (n\mathrm {S}) production is found to be suppressed at low transverse momentum in p+Pb collisions relative to pp collisions. The production of excited charmonium and bottomonium states is found to be suppressed relative to that of the ground states in central p+Pb collisions.
Note:
  • quarkonium: production
  • dimuon: decay
  • p p: scattering
  • p nucleus: scattering
  • lead: nucleus
  • suppression
  • ATLAS
  • differential cross section: measured
  • differential cross section: momentum
  • bottomonium