Measurement of the nuclear modification factor $R_{\rm AA}$ of inclusive J/$\psi$ at midrapidity in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV with ALICE

4 Nov 2019, 17:40
Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Wanda Han Show Theatre & Wanda Reign Wuhan Hotel

Poster Presentation Heavy flavor and quarkonium Poster Session


Dr Xiaozhi Bai (GSI)


Heavy quarks are an excellent probe to study the strongly interacting quark-gluon plasma (QGP) created in high-energy heavy-ion collisions. They are mainly produced via initial hard partonic scattering processes and thus experience the entire evolution of the QGP medium. For J/$\psi$, a bound state of ${c}\bar{c}$ quarks, a strong suppression was seen in central collisions at the SPS and RHIC energies whereas at LHC energies (re-)generation is found to be the dominant production mechanism at low transverse momentum ($p_{\rm T}$) and in central collisions at midrapidity. As both suppression and (re-)generation are caused by the presence of a colored medium, J/$\psi$ yields are indeed a sensitive probe of deconfinement of the charm quarks in the QGP.

In this poster, the nuclear modification factor of inclusive J/$\psi$ will be shown as a function of centrality and $p_{\rm T}$ at midrapidity ($|y|<0.9$) in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV. The status of the new analysis performed on data which were taken in 2018 by ALICE will be presented. This sample provides significantly increased statistics with the central and semi-central triggers compared to the previous runs, in a kinematic region down to $p_{\rm T}$=0 at midrapidity. The measurement will be compared with the previous ALICE results and model calculations. The status of the analysis aiming at disentangling prompt and non-prompt J/$\psi$ will also be discussed.

Primary author

Dr Xiaozhi Bai (GSI)

Presentation Materials