Open-Charm Hadron Measurements in Au+Au Collisions at √sNN = 200 GeV by the STAR Experiment

Universe

卷:5

Jan Vanek¹ 

[1] Nuclear Physics Institute, Czech Academy of Sciences, 250 68 Řež, Czech Republic;

关键词: Quark-Gluon Plasma;    open-charm hadrons;    nuclear modification factor;    elliptic flow;    directed flow;   

DOI  :  10.3390/universe5090196

来源: DOAJ

【 摘 要 】

Study of the open-charm hadron production in heavy-ion collisions is crucial for understanding the properties of the Quark-Gluon Plasma. In these papers, we report on a selection of recent STAR measurements of open-charm hadrons in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200\mathrm{GeV}$ , using the Heavy-Flavor Tracker. In particular, the nuclear modification factors of D ${}^0$ and D ${}^{\pm }$ mesons, elliptic and directed flow of D ${}^0$ mesons, D ${}_{\mathrm{s}}$ /D ${}^0$ and ${\mathsf{\Lambda }}_{\mathrm{c}}/{\mathrm{D}}^0$ yield ratios are discussed. The observed suppression of D ${}^0$ and D ${}^{\pm }$ mesons suggests strong interactions of the charm quarks with the QGP. The measured elliptic flow of D ${}^0$ mesons is large and follows the NCQ scaling, suggesting that charm quarks may be close to thermal equilibrium with the QGP medium. Both D ${}_{\mathrm{s}}$ /D ${}^0$ and ${\mathsf{\Lambda }}_{\mathrm{c}}/{\mathrm{D}}^0$ yield ratios are found to be enhanced in Au+Au collisions. The enhancement can be explained by models incorporating coalescence hadronization of charm quarks. In addition, the directed flow of the D ${}^0$ mesons is measured to be negative and larger than that of light-flavor mesons which is in a qualitative agreement with hydrodynamic model predictions with a tilted QGP bulk.

【 授权许可】

Unknown