Recent ALICE results on quarkonium production in nuclear collisions Biswarup Paul1

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Recent ALICE results on quarkonium production in

nuclear collisions

Biswarup Paul 1

University and INFN Cagliari,

Cittadella Universitaria di Monserrato, 09042, Monserrato (CA), Italy

E-mail: biswarup.paul@cern.ch

Abstract. Quarkonium production has long been regarded as a potential signature of

deconﬁnement in nucleus-nucleus collisions. Recently, the production of J/ψvia regeneration

within the quark-gluon plasma (QGP) or at the phase boundary has been identiﬁed as an

important ingredient for the interpretation of quarkonium production results from lead-lead

collisions at the Large Hadron Collider (LHC). Quarkonium polarization could also be used to

investigate the properties of the hot and dense medium created at the LHC energies. In this

contribution, the latest ALICE results on quarkonium will be presented and discussed. These

include, among others, the nuclear modiﬁcations of (prompt and non-prompt) J/ψand ψ(2S)

production, and the J/ψpolarisation, all measured with lead-lead collisions at the LHC. The

results will be compared with available theoretical model calculations.

1. Introduction

The characterization of the QGP is the main goal of ultra-relativistic heavy-ion collision studies.

Charmonium is one of the most prominent probes used to investigate and quantify the properties

of the QGP. The study of the excited ψ(2S) state is of particular interest. Because of the larger

size and weaker binding energy of the ψ(2S) state, the eﬀects of nuclear medium on its production

might be signiﬁcantly diﬀerent from those of the J/ψ. The regeneration mechanism, within the

QGP or at the phase boundary, is an important ingredient for describing the J/ψproduction

at the LHC energies. ψ(2S) production relative to J/ψrepresents one possible discriminator

between the two diﬀerent regeneration scenarios. The diﬀerence of the J/ψpolarisation between

Pb–Pb [1] and pp collisions [2] at LHC could be related to the modiﬁcation of the J/ψfeed down

fractions, due to the suppression of the excited charmonium states in the QGP, but also to the

contribution of the regenerated J/ψin the low transverse momentum (pT) region. Moreover, it

has been hypothesized that quarkonium states could be polarized by the strong magnetic ﬁeld,

generated in the early phase of the evolution of the system, and by the large angular momentum

of the medium in non-central heavy-ion collisions. This kind of information can be assessed by

deﬁning an ad hoc reference frame where the quantization axis is orthogonal to the event plane

of the collision.

2. ALICE detector and data samples

The ALICE experiment has studied inclusive J/ψand ψ(2S) production in Pb–Pb collisions

at √sNN = 5.02 TeV through its dimuon decay channel. Muons are identiﬁed and tracked

1on behalf of the ALICE Collaboration

arXiv:2210.04356v1 [nucl-ex] 9 Oct 2022

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摘要：

RecentALICEresultsonquarkoniumproductioninnuclearcollisionsBiswarupPaul1UniversityandINFNCagliari,CittadellaUniversitariadiMonserrato,09042,Monserrato(CA),ItalyE-mail:biswarup.paul@cern.chAbstract.Quarkoniumproductionhaslongbeenregardedasapotentialsignatureofdeconnementinnucleus-nucleuscollisions.R...

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Recent ALICE results on quarkonium production in nuclear collisions Biswarup Paul1

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