J/ψ production and nuclear effects in p-Pb collisions at $ \sqrt{{{{\mathrm{s}}_{\mathrm{NN}}}}} $ = 5.02 TeV

Abstract

Inclusive J/ production has been studied with the ALICE detector in p-Pb collisions at the nucleon-nucleon center of mass energy s NN = 5.02 TeV at the CERN LHC. The measurement is performed in the center of mass rapidity domains 2.03 < y cms < 3.53 and -4.46 < y cms < -2.96, down to zero transverse momentum, studying the + -decay mode. In this paper, the J/ production cross section and the nuclear modification factor R pPb for the rapidities under study are presented. While at forward rapidity, corresponding to the proton direction, a suppression of the J/ yield with respect to binary-scaled pp collisions is observed, in the backward region no suppression is present.