Measurement of prompt and nonprompt charmonium suppression in PbPb collisions at 5.02 TeV

The CMS Collaboration

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The nuclear modification factors of J/ψ and ψ(2S) mesons are measured in PbPb collisions at a centre-of-mass energy per nucleon pair of √sNN= 5.02 TeV. The analysis is based on PbPb and pp data samples collected by CMS at the LHC in 2015, corresponding to integrated luminosities of 464μb-1and 28pb-1, respectively. The measurements are performed in the dimuon rapidity range of |y| < 2.4 as a function of centrality rapidity and transverse momentum (pT) from pT= 3 GeV/c in the most forward region and up to 50 GeV/c. Both prompt and nonprompt (coming from b hadron decays) J/ψ mesons are observed to be increasingly suppressed with centrality with a magnitude similar to the one observed at √sNN= 2.76 TeV for the two J/ψ meson components. No dependence on rapidity is observed for either prompt or nonprompt J/ψ mesons. An indication of a lower prompt J/ψ meson suppression at pT >25 GeV/c is seen with respect to that observed at intermediate pT. The prompt ψ(2S) meson yield is found to be more suppressed than that of the prompt J/ψ mesons in the entire pT range.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2017 Dec 24

ASJC Scopus subject areas

  • General

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