Speaker
Dr
Petr Chaloupka
(Czech Technical University in Prague)
Description
Suppression of $J/\psi$ production in heavy-ion collisions due to color screening of quark and antiquark potential in the deconfined medium has been proposed as a signature of quark-gluon plasma (QGP) formation. However, there are other effects that may alter the observed $J/\psi$ yields, such as cold nuclear matter effects, and statistical coalescence of c-$\bar{\mathrm{c}}$ pairs. Indeed, recent measurements in Au+Au and d+Au collisions show that these effects play a non-negligible role. Measurements of $J/\psi$ invariant yields and elliptic flow ($v_2$) in different collision energies, collision systems, and centralities can shed new light on understanding the interplay of these effects for $J/\psi$ production and properties of the QGP.
In this talk I will report STAR measurements of $J/\psi$ production at mid-rapidity, reconstructed via the dielectron decay channel, in Au+Au collisions at $\sqrt{s_{NN}} =$ 39 GeV, 62.4 GeV, 200 GeV together with results from U+U collisions at $\sqrt{s_{NN}}$ = 193 GeV. Nuclear modification factor will be shown as a function of centrality and $p_T$. I will also present results on $J/\psi$ $v_2$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV.
Primary author
Dr
Petr Chaloupka
(Czech Technical University in Prague)
