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Title: Inclusive, prompt and non-prompt J/ψ production at mid-rapidity in Pb-Pb collisions at $$\sqrt{s_{_\text {NN}}}$$ = 2.76 TeV

The transverse momentum (p T) dependence of the nuclear modification factor RAA and the centrality dependence of the average transverse momentum < p T > for inclusive J/ψ have been measured with ALICE for Pb-Pb collisions at $$\sqrt{s_{_\text {NN}}}$$ = 2.76 TeV in the e+e– decay channel at mid-rapidity (|y| < 0.8). The < p T > is significantly smaller than the one observed for pp collisions at the same centre-of-mass energy. Consistently, an increase of R AA is observed towards low p T. These observations might be indicative of a sizable contribution of charm quark coalescence to the J/ψ production. Additionally, the fraction of non-prompt J/ψ from beauty hadron decays, f B, has been determined in the region 1.5 < p T< 10 GeV/c in three centrality intervals. No significant centrality dependence of fB is observed. Finally, the R AA of non-prompt J/ψ is discussed and compared with model predictions. The nuclear modification in the region 4.5 < p T< 10 GeV/c is found to be stronger than predicted by most models.
Authors:
 [1]
  1. Czech Technical Univ. in Prague, Prague (Czech Republic). et al.
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 7; Journal Issue: 7; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
ALICE Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Hadron-Hadron scattering; heavy-ion collisions; transverse-momentum dependence; proton-proton collisions; energy-loss; root-S=7 TEV; pp collisions; jet tomography; aa collisions; Monte-Carlo; QCD matter
OSTI Identifier:
1338521