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J/psi production in Pb-Pb collisions at root s(NN)=2.76 TeV in the ALICE experiment

Author:
Lardeux, Antoine  


Journal:
HOT QUARKS 2012: WORKSHOP FOR YOUNG SCIENTISTS ON THE PHYSICS OF ULTRARELATIVISTIC NUCLEUS-NUCLEUS COLLISIONS


Issue Date:
2013


Abstract(summary):

Quarkonium states are expected to provide essential information on the properties of the high-density strongly-interacting system formed in the early stages of heavy-ion collisions. In particular the J/psi, suppression via color screening is a direct consequence of deconfinement. ALICE is the LHC experiment specifically designed to study nucleus-nucleus collisions. The production of heavy quarkonium states is measured by ALICE down to zero transverse momentum via the mu(+)mu(-) decay channel in the Forward Muon Spectrometer (2.5 < y < 4) and via the e(+)e(-) decay channel in the central barrel at mid rapidity (vertical bar y vertical bar < 0.9). The analysis of the inclusive J/psi, production in Pb-Pb collisions at a center of mass energy per nucleon pair root s(NN)=2.76 TeV is presented. The inclusive J/psi, nuclear modification factor as a function of centrality, transverse momentum and rapidity is shown and compared to similar measurements by other experiments and to theoretical predictions. Finally, a hint of a low transverse momentum J/psi, yield excess, with respect to the expected hadronic channel production, is discussed.


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