Centrality, rapidity and transverse momentum dependence of J/psi suppression in Pb-Pb collisions at sqrts(s_NN)=2.76 TeV

Submission Date: 
03/11/2013
Article Information
Submission Form
System: 
Pb-Pb
Energy: 
2.76 TeV
Abstract Plain Text: 

The inclusive Jpsi nuclear modification  factor (Raa) in Pb-Pb collisions at at √snn =  2.76 TeV 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 mu+mu- decay channel at forward-rapidity (2.5 < y < 4).
The Jpsi 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  0.58 ± 0.01 (stat.) ± 0.09  (syst.) at forward-rapidity.
At low transverse momentum,  significantly larger value of Raa are measured at forward-rapidity compared to measurements at lower energy.
These features suggest that a contribution to the Jpsi yield originates from charm quark (re)combination in the deconfined partonic medium.