Abstract
The ALICE collaboration has measured the inclusive charmonium production at forward rapidity in Pb–Pb and p–Pb collisions at sNN=5.02TeV and sNN=8.16TeV, respectively. In Pb–Pb collisions, the J/ψ and ψ(2S) nuclear modification factors (RAA), as well as the J/ψ elliptic flow (v2) and averaged squared transverse momentum (〈pT2〉), are presented. In p–Pb collisions, the J/ψ nuclear modification factor (RpPb) as a function of pt and rapidity is presented. In both systems, our measurements are compared to theoretical calculations and to the results at lower energies.
Highlights
The measurement of the charmonium production in heavy-ion collisions was first proposed in [1] as a probe for the de-confinement of the QGP through the color screening dissociation mechanism
3] and Pb-Pb its presence collisions at i√n models was important in sNN = 2.76 TeV the inclusive J/ψ suppression measured by ALICE [5] was found to be smaller than the one at RHIC, strengthening the argument for the presence of regeneration
The elliptic flow acquired by the charm quarks in the medium can be further transferred to the regenerated charmonia.measuring the J/ψ elliptic flow provides an additional test for the existence of regeneration and a constraining tool for models that implement it
Summary
The measurement of the charmonium production in heavy-ion collisions was first proposed in [1] as a probe for the de-confinement of the QGP through the color screening dissociation mechanism. Due to the different dissociation temperatures of the charmonium states, sequential suppression was believed to serve as a QGP thermometer. Studies on charmonium multi-differential RAA (in rapidity, pt, and centrality) are important for models to handle the balance between the suppression and regeneration mechanisms. In addition to the competitive dissociation and regeneration mechanisms, Cold Nuclear Matter (CNM) effects can affect the J/ψ and ψ(2S) production in the absence of the hot medium. Measuring charmonium production in p-A collisions is needed in order to better understand and quantify such effects
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