Speaker
Description
In the early and hottest phase of nucleus-nucleus collisions the formation of a Quark-Gluon Plasma (QGP) is expected. Several QGP induced effects, such as the melting of charmonium states due to color screening or the recombination of uncorrelated charm and anti-charm quarks, can influence charmonium yields. Recent ALICE measurements of charmonium nuclear modification factor in Pb--Pb collisions at $\sqrt{s_{NN}}$= 2.76 TeV and $\sqrt{s_{NN}}$= 5.02 TeV showed that the (re)combination mechanism plays a dominant role in the production of charmonia at low $p_{\mathrm{T}}$. In addition, the positive elliptic flow, $v_{2} $, measured for low-$p_{\mathrm{T}}$ J/$\psi$ and D-mesons in Pb--Pb collisions suggests that the charm quarks thermalize in the QGP.
We report on the new measurement of the low and intermediate $p_{\mathrm{T}}$ J/$\psi$ elliptic flow at mid-rapidity ($|y|<$ 0.9) in Pb--Pb collisions at $\sqrt{s_{NN}}$= 5.02 TeV. The J/$\psi$ mesons are reconstructed in the di-electron decay channel using the ALICE central barrel. We employ the Pb--Pb data sets recorded by ALICE during LHC Run 2 in 2015 and 2018. These results are complementary to the existing ALICE measurements at forward rapidity and to ATLAS and CMS high $p_{\mathrm{T}}$ results at mid-rapidity and will be discussed in the context of recent model calculations.
