22-27 September 2016
East Lake International Conference Center
Asia/Chongqing timezone
<a href="http://hp2016.ccnu.edu.cn">http://hp2016.ccnu.edu.cn</a>

J/$\psi$ production in proton+proton and heavy-ion collisions at STAR

24 Sep 2016, 16:00
20m
Jing-Zhou Hall (East Lake International Convention Center)

Jing-Zhou Hall

East Lake International Convention Center

Speaker

Yi Yang (National Cheng Kung University)

Description

The discovery of the J/$\psi$ meson opened the door to studying the heavy quark-antiquark system. This not only provides valuable knowledge for our understanding of Quantum Chromodynamics (QCD), but also plays an important role as a standard candle for discovering new physics. Quark Gluon Plasma (QGP) is a new phase of matter which surprisingly behaves like a perfect fluid, and it can be created in high energy heavy-ion collisions. Comparing the production properties of quarkonium states in proton+proton and heavy-ion collisions plays a crucial role in exacting the QGP properties, for example the nuclear modification factor ($R_{AA}$) and elliptic flow ($v_2$) over a broad $p_T$ range.

The STAR experiment now has the capability of studying the quarkonium states via the dimuon channel with the newly installed Muon Telescope Detector. In this talk, the J/$\psi$ production cross-section, the dependence of J/$\psi$ production yield on charged-particle multiplicity in proton+proton collisions at \sqrt{s} = 200 and 500 GeV, and the measurements of $R_{AA}$ and $v_2$ of J/$\psi$ in Au+Au collisions at \sqrt{S_{NN}} = 200 GeV using dielectron and dimuon channels at the STAR experiment will be presented. The comparisons between the measurements and various model calculations will also be discussed.

Presentation type Oral

Primary author

Yi Yang (National Cheng Kung University)

Presentation Materials