# Étude de la production inclusive de J/Psi dans les collisions pp et Pb-Pb à sqrt(s_(NN)) = 5.02 TeV avec le spectromètre à muons de l'expérience ALICE au LHC

Abstract : 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 suppression was already observed in heavy-ion collisions at SPS and RHIC energies. In Pb-Pb collisions at $\sqrt{s_{\rm{NN}}} = 2.76$ TeV at the LHC, a clear suppression of the J/$\psi$ yield with respect to the one measured in binary-scaled pp collisions (nuclear modification factor R$_{\rm AA}$) 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 (re)combination of deconfined charm and anti-charm quarks during the hydrodynamical expansion of the QGP or at the hadronization stage.\\ In this thesis, we report on the results of the J/$\psi$ production in pp and Pb-Pb collisions measured with the ALICE detector at $\sqrt{s_{\rm{NN}}} = 5.02$ at forward rapidity in the dimuon channel. The cross-section in pp collisions is compared to various model calculations and is used to compute the R$_{\rm AA}$ in Pb-Pb collisions, which is also compared to theoretical predictions as well as to previous measurements.
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Benjamin Audurier. Étude de la production inclusive de J/Psi dans les collisions pp et Pb-Pb à sqrt(s_(NN)) = 5.02 TeV avec le spectromètre à muons de l'expérience ALICE au LHC. Physique des Hautes Energies - Expérience [hep-ex]. Université de Nantes (UNAM), 2017. Français. ⟨tel-01970506⟩

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