Centrality, rapidity and transverse momentum dependence of J/Psi suppression in Pb-Pb collisions at sqrt(sNN)=2.76TeV - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physics Letters B Year : 2014

Centrality, rapidity and transverse momentum dependence of J/Psi suppression in Pb-Pb collisions at sqrt(sNN)=2.76TeV

B. Abelev
  • Function : Author
Laurent Aphecetche
Guillaume Batigne
B. Cheynis
B. Erazmus
  • Function : Author
  • PersonId : 1178907
  • IdRef : 033726485
Marie Germain
Maxime Guilbaud
Philippe Pillot
C. Roy
Alexandre Shabetai
Diego Stocco

Abstract

The inclusive J/Psi nuclear modification factor Raa in Pb-Pb collisions at sqrt(sNN)=2.76TeV has been measured by ALICE as a function of centrality in the e+e- decay channel at mid-rapidity |y| < 0.8 and as a function of centrality, transverse momentum and rapidity in the u+u- decay channel at forward-rapidity 2.5 < y < 4.The J/Psi yields measured in Pb-Pb are suppressed compared to those in pp collisions scaled by the number of binary collisions.The Raa integrated over a centrality range corresponding to 90% of the inelastic Pb-Pb cross section is 0.72 +- 0.06 (stat.) +- 0.10 (syst.) at mid-rapidity and 0.57 +- 0.01 (stat.) +- 0.09 (syst.) at forward-rapidity.At low transverse momentum, significantly larger values of Raa are measured at forward-rapidity compared to measurements at lower energy.These features suggest that a contribution to the J/Psi yield originates from charm quarks (re)combination in the deconfined partonic medium.

Dates and versions

in2p3-00879452 , version 1 (04-11-2013)

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B. Abelev, Laurent Aphecetche, Y.W. Baek, N. Bastid, Guillaume Batigne, et al.. Centrality, rapidity and transverse momentum dependence of J/Psi suppression in Pb-Pb collisions at sqrt(sNN)=2.76TeV. Physics Letters B, 2014, 734, pp.314-327. ⟨10.1016/j.physletb.2014.05.064⟩. ⟨in2p3-00879452⟩
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