Étude de la collectivité de quarkonium dans les collisions Pb-Pb à 5.36 TeV du Run 3 du LHC

A few microseconds after the Big Bang, the Universe was in a state of quark-gluon plasma (QGP) where quarks and gluons are de-confined from hadrons. The latter, formed at very high temperatures or energy densities, can be recreated in ultra-relativistic heavy-ion collisions at the LHC. To study such a state of matter, charmonia, bound states of charm quarks and antiquarks, play a crucial role since their production and transport, in particular for J/ψ hadron, are modified in the medium, thus reveal the properties of QGP.Since 2022, ALICE has begun its new data acquisition period for Run 3 with important upgrades. With regard to the measurement of quarkonia through muon decay channel in the forward rapidity, the Muon Spectrometer required certain commissioning steps to achieve the promised performance in Run 3; Among these, one essential step is the alignment of tracking system. The alignment of Muon Spectrometer, carried out as part of the thesis work,plays a fundamental role in the quarkonia reconstruction, which will enable the analysis to continue.Among the signatures of the QGP, the anisotropic flow of quarkonia is of particular interest to us. The latter, when it comes to elliptic flow, provides us with evidence to understand the thermalization of quarkonia, as well as theirdynamic evolution compared to transport calculations where the QGP is considered as fluid described by hydrodynamics. In the work of this thesis, new measurements of J/ψ flow in Pb-Pb collisions were carried out, combining several methods with improved precision and range thanks to Run 3.