ALICE results on charmonium production in pp and heavy-ion collisions

<!--HTML--><p><span><span><span style="color:#000000"><span><span><span><span><span><span><span><span><span><span><span><span>Ultrarelativistic nucleus-nucleus collisions lead to the creation of a long lived deconfined quark-gluon plasma phase (QGP),<br /> which is the object of intense studies at both the LHC and lower energy experiments. Infering the properties of this hot and dense medium<br /> requires knowledge of the entire collision evolution, both before and after the QGP phase. One way of exploring the initial state<br /> conditions is via measurements in systems which are not expected to exhibit the strongly interacting QGP phase, like proton-lead (p-Pb) and proton-proton (pp) collisions.<br /> However, recent observations in p-Pb collisions seem to dispute this expectation, the results being suggestive of final state effects.<br /> Charm quarks are produced only during the early pre-QGP hard scatterings, hence charm based observables are very well suited<br /> probes of the deconfined medium. In particular, charmonium production is an important study case that exhibits unique features<br /> at the LHC energies, like the charm recombination.<br /> In this seminar, we will present and discuss a review of the most recent charmonium measurements reported by the ALICE Collaboration<br /> in Pb-Pb, p-Pb and pp collisions. We will focus on the high precision J/$\psi$ anisotropic flow measurements in Pb-Pb collisions,<br /> the J/$\psi$ and $\psi$(2S) nuclear suppression in p-Pb collisions and on the J/$\psi$ production in high multiplicity pp and p-Pb collisions.</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></p>