Erlangen 2026 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Heavy-Ion Collisions and QCD Phases III
HK 23.3: Vortrag
Mittwoch, 18. März 2026, 14:30–14:45, PHIL C 301
Measurement of ψ(2S) production at midrapidity in Pb–Pb Collisions at √sNN = 5.36 TeV with ALICE — •Jinjoo Seo for the ALICE Germany collaboration — Heidelberg University
Quarkonium is a sensitive probe of the quark-gluon plasma (QGP) created in ultra-relativistic heavy-ion collisions. In the QGP, color screening leads to the suppression of all charmonium states. However, the large charm production cross-section at LHC energies can also cause enhanced charmonium production at the phase boundary or (re-)generation throughout the QGP evolution. The interplay between suppression and (re-)generation mechanisms reflects the underlying charm-quark dynamics in the QGP and during hadronization. Studying the ψ(2S) is particularly interesting because of its weaker binding energy, larger spatial size, and smaller feed-down contribution compared to the J/ψ. Previous measurements have shown a stronger suppression of ψ(2S) relative to J/ψ and are compatible with both statistical hadronization at the phase boundary as well as a model with continuous breakup and formation in the QGP. To clarify the situation, data at low transverse momentum and midrapidity are necessary. In this contribution, we present the first results of inclusive ψ(2S) production at midrapidity in Pb–Pb collisions at √sNN = 5.36 TeV with the ALICE detector, together with the corresponding J/ψ measurements.
Keywords: QGP; Charmonium