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

ALICE Collaboration

doi:10.1016/j.physletb.2022.136986

paper

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

arXiv:2110.10006 · doi:10.1016/j.physletb.2022.136986

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 $s_{N N} = 5.02$ 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 $D_{s}^{+} \to ϕ π^{+}$ , with $ϕ \to K^{-} K^{+}$ , 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 $σ$ and 2.4 $σ$ 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.

arXiv comment29 pages, 7 captioned figures, 3 tables, authors from page 24, published version, figures at http://alice-publications.web.cern.ch/node/7446

Measurement of prompt Ds+​-meson production and azimuthal anisotropy in Pb-Pb collisions at sNN​​=5.02 TeV

Abstract

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