Transverse-momentum and event-shape dependence of D-meson flow harmonics in Pb-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV

Abstract

The elliptic and triangular flow coefficients $v_2$ and $v_3$ of prompt D${}^0$, D${}^{+}$, and D${}^{\ast +}$ mesons were measured at midrapidity ($|y|<0.8$) in Pb-Pb collisions at the centre-of-mass energy per nucleon pair of $\sqrt{s_{NN}}=5.02$ TeV with the ALICE detector at the LHC. The D mesons were reconstructed via their hadronic decays in the transverse momentum interval $1<p_{\mathrm{T}}<36$ GeV/$c$ in central (0-10%) and semi-central (30-50%) collisions. Compared to pions, protons, and J/$\psi$ mesons, the average D-meson $v_n$ harmonics are compatible within uncertainties with a mass hierarchy for $p_{\mathrm{T}}\lesssim 3$ GeV/$c$, and are similar to those of charged pions for higher $p_{\mathrm{T}}$. The coupling of the charm quark to the light quarks in the underlying medium is further investigated with the application of the event-shape engineering (ESE) technique to the D-meson $v_2$ and $p_{\mathrm{T}}$-differential yields. The D-meson $v_2$ is correlated with average bulk elliptic flow in both central and semi-central collisions. Within the current precision, the ratios of per-event D-meson yields in the ESE-selected and unbiased samples are found to be compatible with unity. All the measurements are found to be reasonably well described by theoretical calculations including the effects of charm-quark transport and the recombination of charm quarks with light quarks in a hydrodynamically expanding medium.

28 pages, 6 captioned figures, 2 tables, authors from page 23, published version, figures at http://alice-publications.web.cern.ch/node/6222

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