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Title: Quarkonia suppression in PbPb collisions at sNN=2.76 TeV

We estimate the modification of quarkonia yields due to different processes in the medium produced in PbPb collisions at LHC energy. The quarkonia and heavy flavor cross sections calculated up to next-to-leading order (NLO) are used in the study. Shadowing corrections are obtained with the NLO EPS09 parametrization. A kinetic model is employed which incorporates quarkonia suppression inside a QGP, suppression due to hadronic comovers, and regeneration from charm pairs. The quarkonia dissociation cross section due to gluon collisions has been considered and the regeneration rate has been obtained using the principle of detailed balance. The modification in quarkonia yields due to collisions with hadronic comovers has been estimated assuming that the comovers are pions. The manifestations of these effects on the nuclear modification factors for both J/ψ and Υ in different kinematic regions has been demonstrated for PbPb collisions at √sNN = 2.76 TeV in comparison with the measurements. Both the suppression and regeneration due to a deconfined medium strongly affect the low and intermediate pT range. As a result, the large observed suppression of J/ψ at pT > 10GeV/c exceeds the estimates of suppression by gluon dissociation.
Authors:
 [1] ;  [1] ;  [2]
  1. Bhabha Atomic Research Center, Mumbai (India); Homi Bhabha National Institute, Mumbai (India)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Davis, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-737145
Journal ID: ISSN 0556-2813; PRVCAN
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 2; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; quark-gluon plasma; quarkonia; suppression; regeneration
OSTI Identifier:
1399757
Alternate Identifier(s):
OSTI ID: 1210113