Speakers
Description
The production of charmonium states (for instance J/$\psi$ and $\psi(2S)$) is one of the probes studied to investigate the properties of the Quark-Gluon Plasma (QGP) formed in high-energy heavy-ion collisions. Indeed, the presence of a deconfined medium should modify the charmonium production yield, due to the color screening of the charm quark anti-quark potential. Such a suppression was already observed in heavy-ion collisions at SPS and RHIC energies. In Pb-Pb collisions at $\sqrt{s_{\text{NN}}} = 2.76$ TeV at the LHC, a clear suppression of the J/$\psi$ yield with respect to the one measured in binary-scaled pp collisions was observed, but much smaller than that at lower collision energies. This observation can be explained by the presence of a new production mechanism, the recombination of deconfined charm and anti-charm quarks during the hydrodynamical expansion of the QGP or at the hadronization stage. In this presentation, we will report on the results of the charmonium production in Pb-Pb collisions measured with the ALICE detector. In particular, we will focus on the new measurements obtained at $\sqrt{s_{\text{NN}}} = 5.02$ TeV for the J/$\psi$ at forward rapidity in the dimuon channel and their comparison with previous measurements at lower energy and model calculations.
