D-meson azimuthal anisotropy in mid-central Pb-Pb collisions at $\sqrt{{\mathbf{s}}_{\mathrm{NN}}}=5.02$ TeV

Abstract

The azimuthal anisotropy coefficient $v_2$ of prompt D${}^0$, D${}^{+}$, D${}^{\ast +}$ and D${}_s^{+}$ mesons was measured in mid-central (30-50% centrality class) Pb-Pb collisions at a centre-of-mass energy per nucleon pair $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV, with the ALICE detector at the LHC. The D mesons were reconstructed via their hadronic decays at mid-rapidity, $|y|<0.8$, in the transverse momentum interval $1<p_{\mathrm{T}}<24$ GeV/$c$. The measured D-meson $v_2$ has similar values as that of charged pions. The D${}_s^{+}$ $v_2$, measured for the first time, is found to be compatible with that of non-strange D mesons. The measurements are compared with theoretical calculations of charm-quark transport in a hydrodynamically expanding medium and have the potential to constrain medium parameters.

arXiv comment18 pages, 3 captioned figures, authors from page 13, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/3650

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