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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Heavy-Ion Collisions and QCD Phases I

HK 8.4: Talk

Monday, March 11, 2024, 17:45–18:00, HBR 62: EG 03

Charmonium production measurement at midrapidity using TRD-triggered data in ALICE — •Jinjoo Seo — Physikalisches Institut Universität Heidelberg

Quarkonium production is considered one of the golden probes of the quark-gluon plasma (QGP) formation in heavy-ion collisions. Due to their large mass, the production of heavy-quarks is governed by hard scales of QCD, while the formation of the bound quarkonium state involves soft QCD scales. Quarkonium productions in pp collision is essential to provide a baseline for Pb–Pb results, and also useful for investigating the production mechanisms. The ψ(2S) production relative to J/ψ is observable with discriminating power between the two quarkonium production models. Thanks to the ALICE online single-electron triggers from the Transition Radiation Detector (TRD), the ψ(2S) signal can be extracted at midrapidity in the dielectron channel.

In this contribution, the J/ψ and ψ(2S) productions and the excited-to-ground state yield ratio (ψ(2S)-to-J/ψ) at midrapidity with the TRD-triggered data measured in ALICE in pp collisions at √s = 13 TeV will be shown.

Keywords: Charmonium