Modification of J/psi production in the QGP
Late autumn 2018, the ALICE experiment collected a high-statistics data set with Pb-Pb collisions at a centre-of-mass energy of 5.02 TeV. High-quality reference data from p-p collisions at the same energy are also available.
This will allow a precise determination of the medium-induced modification of the charmonium production in the heavy system, as a function of collision centrality and transverse momentum. Earlier data sets have revealed tantalizing hints of charmonium enhancement in central collisions and at low transverse momenta; this data sample will strongly reduce experimental uncertainties. Comparison with theoretical model calculations may allow to discriminate between different recombination scenarios: statistical regeneration at the phase transition from QGP to hadron gas, versus dynamical interplay between melting and regeneration processes throughout the evolution of the hot system.