# Quark Matter 2014 - XXIV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

19-24 May 2014
Europe/Zurich timezone

## High-$p_T$ $J/\psi$ production in $U+U$ collisions at STAR

20 May 2014, 16:30
2h

### spectrum

Board: F-64
Poster Open Heavy Flavour and Quarkonia

### Speaker

Guannan Xie (for the STAR Collaboration)

### Description

The Relativistic Heavy-Ion Collider (RHIC) is built to search for the QGP in laboratory through the high energy heavy ion collisions. Suppression of the $J/\psi$ production due to color screening of the $c\overline{c}$ binding potential in the deconfined medium has been proposed as a signature of the QGP formation. High-$p_T$ $J/\psi$ measurements in $Au+Au$ collisions at RHIC published recently by the STAR collaboration show significant suppression in the most central collisions. Since secondary production via $c\overline{c}$ recombination and so called cold nuclear matter effects are small at high $p_T$, these results point to the color screening features. The energy density is expected to be on average about 20% higher in $U+U$ collisions than in $Au+Au$ collisions, therefore the $J/\psi$ measurement in $U+U$ collisions at high $p_T$ can provide new insight in the study of color screening features for charmonium. In this presentation we will report the status of the analysis of mid-rapidity $(|y|<1)$ $J/\psi\rightarrow$$e^{+}e^{-}$ production in $U+U$ collisions at $\sqrt{s_{NN}} =$193 GeV at STAR using RHIC year 2012 data triggered with the Barrel Electromagnetic Calorimeter.
On behalf of collaboration: STAR

### Primary author

Guannan Xie (for the STAR Collaboration)

 Slides