Speaker
Description
Quarkonium production has long been identified as one of the golden signatures of deconfinement in heavy-ion collisions. Recently, the production of J/$\psi$ via (re)generation within the quark-gluon plasma (QGP) or at the phase boundary has been considered a key ingredient for the interpretation of quarkonium measurements in Pb$-$Pb collisions at the Large Hadron Collider (LHC). In addition, the non-prompt J/$\psi$ component, originating from b-hadron decays, allows one to access the interaction of beauty quarks with the QGP in a wide transverse momentum window. Measurements of elliptic flow of charmonia and bottonomia can shed light on the thermalization of charm and beauty quarks inside the QGP. Polarization measurements, besides bringing additional insights into the properties of the QGP, can probe the strong magnetic field generated by the fast motion of the charges of the nuclei as well as the large angular momentum of the medium in non-central events, when performed as a function of the event plane. The study of quarkonium production in smaller systems, such as p$-$Pb and pp, provides a reference for the study of nuclear modifications. Moreover, multiplicity dependent measurements offer a unique opportunity to study both the role of multiparton interactions and the onset of collective effects in small systems.
In this contribution, the latest results on quarkonium production at the LHC will be presented, and the comparison with available theoretical model calculations will be discussed.
