Measurements of $D_S^{\pm }$-meson production in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV in STAR

Abstract

We present the first measurement of the nuclear modification factor $R_{AA}$ and elliptic flow $v_2$ of $D_s$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV with the STAR detector. These results have been compared with those of other open charm mesons and strange mesons to determine how the (possibly) strangeness equilibrated partonic matter affects the $D_s$ meson production. We find that the nuclear modification factor of $D_S$ are systematically higher than unity and $D^0$ $R_{\mathrm{AA}}$. The ratio $D_s/D^0$ is shown as a function of transverse momentum for the 10-40$\%$ most central Au+Au collisions and compared with that in $p+p$ collisions obtained from PYTHIA. It is also compared with that in Pb-Pb collisions at 2.76 TeV by the ALICE experiment. Our measurement indicates a hint of enhancement of $D_S$ production in Au+Au collisions with respect to $p+p$ collisions as compared to non-strange $D$ mesons.

Comments: Proceeding of the Quark Matter 2015 conference, Kobe, Sep. 27 - Oct. 3, 2015