Measurements reveal charmonium production ratios in various collision systems, suggesting important interactions.
Modificationo of quarkonium production in hadronic collisions provide key experimental observables to probe the interaction of heavy quarks with nuclear matter. The excited ψ(2S) charmonium state, with its relatively low binding energy, is especially sensitive to such effects. New HHCb measurements on the ψ(2S)/ J/ψ production ratio in pp, pPb, and PbPb collisions, together with prospects for forthcoming measurements using Run 3 data are presented here compared to the latest theory predictions.
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Camilla De Angelis (2026) studied this question.
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