Measurement of prompt ${\mathrm{D}}_{\mathrm{s}}^{+}$-meson production and azimuthal anisotropy in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

Abstract

The production yield and angular anisotropy of prompt $D_s^{+}$ mesons were measured as a function of transverse momentum ($p_T$) in Pb-Pb collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_{NN}}=5.02$ TeV collected with the ALICE detector at the LHC. $D_s^{+}$ mesons and their charge conjugates were reconstructed at midrapidity ($|y|<0.5$) from their hadronic decay channel $D_s^{+}\to \varphi {\pi }^{+}$, with $\varphi \to K^{-}{K}^{+}$, in the $p_T$ intervals $2<p_T<50$ GeV/$c$ and $2<p_T<36$ GeV/$c$ for the 0-10% and 30-50% centrality intervals. For $p_T>10$ GeV/$c$, the measured $D_s^{+}$-meson nuclear modification factor $R_{AA}$ is consistent with the one of non-strange D mesons within uncertainties, while at lower $p_T$ a hint for a $D_s^{+}$-meson $R_{AA}$ larger than that of non-strange D mesons is seen. The enhanced production of $D_s^{+}$ relative to non-strange D mesons is also studied by comparing the $p_T$-dependent $D_s^{+}/D^0$ production yield ratios in Pb-Pb and in pp collisions. The ratio measured in Pb-Pb collisions is found to be on average higher than that in pp collisions in the interval $2<p_T<8$ GeV/$c$ with a significance of 2.3$\sigma$ and 2.4$\sigma$ for the 0-10% and 30-50% centrality intervals. The azimuthal anisotropy coefficient $v_2$ of prompt $D_s^{+}$ mesons was measured in Pb-Pb collisions in the 30-50% centrality interval and is found to be compatible with that of non-strange D mesons. The main features of the measured $R_{AA}$, $D_s^{+}/D^0$ ratio, and $v_2$ as a function of $p_T$ are described by theoretical calculations of charm-quark transport in a hydrodynamically expanding quark-gluon plasma including hadronisation via charm-quark recombination with light quarks from the medium. The $p_T$-integrated production yield of $D_s^{+}$ mesons is compatible with the prediction of the statistical hadronisation model.

29 pages, 7 captioned figures, 3 tables, authors from page 24, published version, figures at http://alice-publications.web.cern.ch/node/7446

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