Speaker
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 |
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