Abstract
The azimuthal anisotropy coefficient v_{2} of prompt D^{0}, D^{+}, D^{*+}, and D_{s}^{+} mesons was measured in midcentral (30%-50% centrality class) Pb-Pb collisions at a center-of-mass energy per nucleon pair sqrt[s_{NN}]=5.02 TeV, with the ALICE detector at the LHC. The D mesons were reconstructed via their hadronic decays at midrapidity, |y|<0.8, in the transverse momentum interval 1<p_{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 nonstrange 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.
Highlights
Quantum chromodynamics predicts that strongly interacting matter under extreme conditions of a high temperature and energy density undergoes a transition from the hadronic phase to a color-deconfined medium, called quark-gluon plasma (QGP) [1,2,3,4]
Heavy quarks are predominantly produced in hard scatterings before the QGP formation [5,6]. They experience all stages of the medium evolution, interacting with its constituents via elastic [7] and inelastic [8,9] processes
Evidence of in-medium interactions and energy loss of charm quarks is provided by the strong modification of the transverse momentum distributions of heavy-flavor hadrons in heavy-ion collisions with respect to pp collisions
Summary
TeV and of the pion v2 at by the observation that the pT differential v2 of charged particles, which is dominated by the pion component, is compatible at these two energies [66]. The D-meson v2 is similar to that of πÆ in the common pT interval (1–16 GeV/c), and it is lower in the interval below 4 GeV/c, the difference reaching about 2σ in 2–4 GeV/c, where a mass ordering of v2 is observed for light-flavor hadrons and described by hydrodynamical calculations [65].
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