Experimental overview: quarkonia as probes for deconfinement

Abstract

The current status of the experimental investigation of quarkonia in heavy-ion collisions as probes for deconfinement is reviewed. The emphasis is put on the qualitative understanding of charmonia (ccbar bound states) and bottomonia (bbbar) based on the results in the past few years. In particular, the observation of non-primordial J/psi (ccbar) production as signature of deconfinement based on different observables and the sequential suppression patterns of the Upsilon (bbbar) states are discussed. An outlook focusing on the time scale until the next quark matter conference is provided.

Figures (3)

• Figure 1: Results on the inclusive J/$\psi$ nuclear modification factor from ALICE at midrapidity (left) and at forward rapidity (middle) taken from ALICE:2023gco compared to model calculations Andronic:2019wvaZhao:2007hhZhou:2014kka, see also in Ref.ALICE:2023hou for the separation of the prompt and the non-prompt part. Preliminary results on the elliptic flow of J/$\psi$ from Run 3 are shown on the right.
• Figure 2: The production ratio of J/$\psi$ over $D^0$ as measured in ALICE at midrapidity compared with the statistical hadronization model Andronic:2019wva taken from Ref.ALICE:2023gco. The same ratio as function of $N_{coll}$ in proton-Neon and lead-Neon collisions as measured by LHCb in Ref. LHCb:2022qvj.
• Figure 3: Suppression hierarchy between the three vector states below open beauty threshold as measured by CMS CMS:2023lfu.