Quarkonia production in proton-proton and Pb-Pb collisions with ALICE

State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China

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Published online: 5 November 2025

Abstract

Charmonia are a valuable tool to investigate nuclear matter under extreme conditions, and particularly the strongly interacting medium formed in heavy-ion collisions. At the LHC energies, the regeneration process has been found to significantly impact the observed charmonium yields. In particular, the measurement of ψ(2S) production relative to J/ψ in Pb-Pb collisions has a strong discriminating power between different regeneration scenarios. Additionally, the study of quarkonium production in proton–proton (pp) collisions represents the reference for interpreting results obtained in Pb–Pb collisions and it is a key measurement to distinguish among the quarkonium production models in pp and p–Pb. In this contribution, preliminary findings on the ratio of ψ(2S)-to-J/ψ and inclusive J/ψ cross section in pp √s = 13.6 TeV in Run 3, as well as published results about double ratio between Pb-Pb and pp collisions at 5.02 TeV and the inclusive J/ψ yield in pp collisions at √s = 13 TeV and Pb–Pb collisions at √s_NN = 5.02 TeV in Run 2 measured by the ALICE Collaboration will be presented and compared with existing model calculations.