Quarkonium production in nucleus-nucleus collisions with ALICE

5 Nov 2019, 14:20
20m
Ball Room 3 (Wanda Reign Wuhan Hotel)

Ball Room 3

Wanda Reign Wuhan Hotel

Oral Presentation Heavy flavor and quarkonium Parallel Session - Heavy flavor II

Speaker

Xiaozhi Bai for ALICE Collaboration (GSI)

Description

Heavy quarks are produced at the first instant of a nucleus-nucleus collision and therefore
are an important tool to study the subsequent high energy-density medium formed in
relativistic heavy-ion collisions. Over the last few decades major efforts have been
undertaken in order to understand the properties of the Quark-Gluon Plasma (QGP) using
quarkonia. The extent of medium modification for heavy-quark production in heavy-ion
collisions is measured in terms of a nuclear modification factor $R_{\rm AA}$, defined as
the quarkonium yield in heavy-ion collisions with respect to the pp cross sections scaled
by the nuclear overlap function. A possible path-length dependent quarkonium dissociation
probability as well as a contribution of (re)combined quarkonia from flowing heavy quarks
would lead to an azimuthal anisotropy of quarkonium production relative to the reaction plane.

Recent ALICE J/$\psi$ $R_{\rm AA}$ results for Pb-Pb collisions at
$\sqrt{s_{\rm NN}}$ = 5.02 TeV will be presented for mid and forward rapidity.
The individual contribution of prompt and non-prompt J/$\psi$ production will be
discussed for the $R_{\rm AA}$ measurement at mid-rapidity. At forward rapidity,
the centrality, $p_{\rm T}$ and rapidity dependence of J/$\psi$ and $\psi({\rm 2S})$
$R_{\rm AA}$ will be discussed. The $\Upsilon$ $R_{\rm AA}$ will also be shown.
The ${\rm J}/\psi$ elliptic and triangular flow, as well as event-shape-engineering
studies and the first measurement of the $\Upsilon$ elliptic flow will be reported.
The ALICE results will be compared with those by other LHC experiments and the current
theoretical interpretation of the results will be also discussed.

Primary author

Presentation Materials