Mesure de la production de J/psi en collisions p-Pb au LHC avec le spectromètre à muons d'ALICE

Hard probes represent one of the hottest topics of the modern high energy physics. The production mechanism of quarkonia (mesons composed of a charm or beauty quark and its antiquark) in hadronic collisions is of particular interest. The suppression of J/psi and other charmonium states was predicted as one of the first signatures of the Quark Gluon Plasma (QGP) formation and was seen at RHIC and SPS. It was also studied at the LHC in Pb-Pb collisions. However, other effects can affect the charmonium production in Pb-Pb collisions without the presence of the QGP. These effects are inherent to the use of nuclei and are called “Cold Nuclear Matter” (CNM) effects. They can be studied in p-Pb collisions. This thesis is dedicated to the studies of J/psi production in p-Pb collisions at the LHC at a center of mass energy of 5.02 TeV per nucleon pair. J/psi production is studied as a function of transverse momentum, rapidity and event activity. These results represent a significant step to better understanding of the CNM effects and to the establishment of a reference for J/psi production in Pb-Pb collisions. Key words: J/psi , cold nuclear matter, ALICE, muon spectrometer, p-Pb.