Journal Article Differential studies of inclusive J/ψ and ψ(2S) production at forward rapidity in Pb-Pb collisions at √ sNN=2.76 TeV

ALICE Collaboration  ,  Busch, O.  ,  Chujo, T.  ,  Esumi, S.  ,  Miake, Y.

2016 ( 5 )  , p.179 , 2016-05 , Springer
The production of J/ψ and ψ(2S) was studied with the ALICE detector in Pb-Pb collisions at the LHC. The measurement was performed at forward rapidity (2.5 < y < 4) down to zero transverse momentum (p t ) in the dimuon decay channel. Inclusive J/ψ yields were extracted in different centrality classes and the centrality dependence of the average p t is presented. The J/ψ suppression, quantified with the nuclear modification factor (R AA), was measured as a function of centrality, transverse momentum and rapidity. Comparisons with similar measurements at lower collision energy and theoretical models indicate that the J/ψ production is the result of an interplay between color screening and recombination mechanisms in a deconfined partonic medium, or at its hadronization. Results on the ψ(2S) suppression are provided via the ratio of ψ(2S) over J/ψ measured in pp and Pb-Pb collisions.

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