Speaker
Description
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.
The regeneration process of J/$\psi$ in the QGP or at the phase boundary is crucial for describing the observed centrality, rapidity, and $p_{\mathrm T}$ dependence of J/$\psi$ nuclear modification factor at the LHC.
Quarkonium production in more dilute systems is essential to provide a baseline for Pb--Pb results.
They are also useful for investigating the production mechanisms for pp collisions and studying the cold nuclear matter effect for p--Pb collisions.
The $\psi$(2S) production relative to J/$\psi$ is observable with strong discriminating power between the two regeneration scenarios in Pb--Pb collisions, as well as among quarkonium production models in pp and p--Pb systems.
Thanks to the ALICE online single-electron triggers from the Transition Radiation Detector (TRD), the $\psi$(2S) signal can be extracted at midrapidity in the dielectron channel.
In this contribution, the first studies on J/$\psi$ and $\psi$(2S) productions at midrapidity with the TRD-triggered data measured in ALICE in pp collisions at $\sqrt{s} = 13$ TeV will be shown for the first time, along with recently published J/$\psi$ results based on TRD-triggered data in p--Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 8.16$ TeV.
| Category | Experiment |
|---|---|
| Collaboration (if applicable) | ALICE |
