Suppression and azimuthal anisotropy of prompt and nonprompt J/ψ production in PbPb collisions at √sNN = 2.76 TeV

CMS Collaboration

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Abstract

The nuclear modification factor RAA and the azimuthal anisotropy coefficient v2 of prompt and nonprompt (i.e. those from decays of b hadrons) J/ψ mesons, measured from PbPb and pp collisions at√sNN = 2.76 TeV at the LHC, are reported. The results are presented in several event centrality intervals and several kinematic regions, for transverse momenta pT > 6.5 GeV/c and rapidity |y| < 2.4, extending down to pT = 3 GeV/c in the 1.6 < |y| < 2.4 range. The v2 of prompt J/ψ is found to be nonzero, but with no strong dependence on centrality, rapidity, or pT over the full kinematic range studied. The measured v2 of nonprompt J/ψ is consistent with zero. The RAA of prompt J/ψ exhibits a suppression that increases from peripheral to central collisions but does not vary strongly as a function of either y or pT in the fiducial range. The nonprompt J/ψ RAA shows a suppression which becomes stronger as rapidity or pT increases. The v2 and RAA of open and hidden charm, and of open charm and beauty, are compared.
Original languageEnglish
Article number252
Number of pages33
JournalEuropean Physical Journal C
Volume77
Issue number4
DOIs
Publication statusPublished - 2017
Externally publishedYes

Keywords

  • Collisions
  • Jet quenching
  • Jets

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