Speaker
Description
Quarkonium production in high-energy heavy-ion collisions is a key tool to study the production and the properties of the quark-gluon plasma (QGP), a state of matter in which quarks and gluons are no longer confined inside hadrons.
Charmonia are quarkonium bound states consisting of a charm and an anti-charm quark.
Charmonium production in Pb--Pb collisions is sensitive to the quark–gluon plasma through color-screening–induced suppression and regeneration from uncorrelated $\mathrm{c}\bar{\mathrm{c}}$ pairs, whose interplay depends on the medium properties and on the quarkonium binding energy. A comparative study of J/$\psi$ and $\psi$(2S) production provides a powerful probe of these effects: the more weakly bound $\psi$(2S) is expected to be more strongly suppressed, while regeneration is predicted to play a significant role at LHC energies, making the relative production of the two states especially sensitive to the medium evolution and challenging for theoretical models. In this poster, I will present the analysis status of inclusive J/$\psi$ and $\psi$(2S) production at forward rapidity (2.5 $< y <$ 4) in Pb–-Pb collisions at a center-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}} = 5.36$ TeV. The analysis is based on the data collected in 2023 and 2024 by the upgraded ALICE detector during LHC Run 3, which provide a larger data sample compared to previous data-taking periods. The double ratio of $\psi$(2S) to J/$\psi$ yields in Pb–-Pb and pp collisions, the J/$\psi$ and $\psi$(2S) nuclear modification factor $R_{AA}$ will also be reported. The results will be compared to similar measurements from data collected during LHC Run 2, and with theoretical models.
| Is this an experimental talk? | Yes |
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| Is this on behalf of a collaboration? | Yes |
| Which collaboration? | ALICE |
| Are you willing to present as a poster if it is not selected for oral presentation? | Yes |