PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T05 Ultra-Relativistic Nuclear Collisions
Recent charmonium measurements in Pb–Pb collisions
H. Sharma*  on behalf of the ALICE collaboration
Full text: pdf
Pre-published on: February 08, 2024
Published on: March 21, 2024
Charmonia are key probes to study nuclear matter in extreme conditions, like the quark--gluon plasma formed in heavy-ion collisions. At LHC energies, the regeneration process due to the abundantly produced charm quarks was found to considerably affect measured charmonium observables. Comprehensive measurements of charmonia, including both ground and excited states, are crucial to discriminate among different regeneration scenarios assumed in theoretical calculations. Charmonia can also be sensitive to the initial states of the heavy-ion collisions. In particular, their spin-alignments can be affected by the strong magnetic field generated in the early phase, as well as by the large angular momentum of the medium in non-central collisions. The determination of the component originating from beauty-hadron decays, known as non-prompt charmonium, grants a direct insight into the nuclear modification factor of beauty hadrons, which is expected to be sensitive to the energy loss experienced by the ancestor beauty quarks inside the QGP. Furthermore, once it is subtracted from the inclusive charmonium production, it allows a direct access to prompt charmonia.
In this contribution, recent ALICE results on charmonium production are reported. Inclusive J/$\psi$ nuclear modification factors, obtained at mid and forward rapidity in Pb--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV, are discussed. Also, prompt and non-prompt J/$\psi$ nuclear modification factors at midrapidity are presented. Results from $\psi$(2S) nuclear modification factor and J/$\psi$
polarization with respect to a quantization axis orthogonal to the event-plane obtained at forward rapidity in Pb--Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV, are also described. Results are compared to available model calculations.
DOI: https://doi.org/10.22323/1.449.0211
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