Centrality dependence of inclusive J/$ψ$ production in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV

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5.02 TeV
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We present the ALICE measurement of the inclusive J/ψ production in p-Pb collisions at sNN = 5.02 TeV as a function of the centrality of the collision, defined from the energy deposited in the zero- degree calorimeters. The measurement is performed with the ALICE detector down to zero transverse momentum, pT, in the backward (4.46 < ycms < 2.96) and forward (2.03 < ycms < 3.53) rapidity intervals in the dimuon decay channel and in the mid-rapidity region (1.37 < ycms < 0.43) in the dielectron decay channel. The pT-differential J/ψ production cross section at backward and forward rapidity is measured in several centrality classes, together with the corresponding average pT and p2T values. The nuclear modification factor QpPb is presented as a function of centrality in the three rapidity intervals, and, additionally, at backward and forward rapidity, as a function of pT for different centrality classes. At both mid- and forward rapidity, the J/ψ production is suppressed by up to 40% compared to the one in pp collisions scaled by the number of binary collisions. The degree of suppression increases towards central p-Pb collisions, especially at forward rapidity, and with decreasing pT of the J/ψ. At backward rapidity, while the QpPb is compatible with unity, an increase of QpPb from peripheral to central p-Pb collisions is observed. 

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