Studies of $J/\psi$ production at forward rapidity in Pb–Pb collisions at $\sqrt{s_{\rm NN}}= 5.02$ TeV

S. Acharya , Kamil Deja , Łukasz Graczykowski , Monika Jakubowska , Małgorzata Janik , Adam Kisiel , Julian Myrcha , Piotr Nowakowski , Janusz Oleniacz , Jan Pluta , Przemysław Rokita , Krystian Rosłon , M. O. Schmidt , Tomasz Trzciński , Hanna Zbroszczyk

Abstract

The inclusive J= production in Pb{Pb collisions at the center-of-mass energyper nucleon pairpsNN= 5:02 TeV, measured with the ALICE detector at the CERN LHC,is reported. The J= meson is reconstructed via the dimuon decay channel at forward ra-pidity (2:5< y <4) down to zero transverse momentum. The suppression of the J= yieldin Pb{Pb collisions with respect to binary-scaled pp collisions is quanti ed by the nuclearmodi cation factor (RAA). TheRAAatpsNN= 5:02 TeV is presented and compared withprevious measurements atpsNN= 2:76 TeV as a function of the centrality of the collision,and of the J= transverse momentum and rapidity. The inclusive J= RAAshows a sup-pression increasing toward higher transverse momentum, with a steeper dependence forcentral collisions. The modi cation of the J= average transverse momentum and averagesquared transverse momentum is also studied. Comparisons with the results of modelsbased on a transport equation and on statistical hadronization are carried out