Measurement of prompt D${}^0$ meson azimuthal anisotropy in PbPb collisions at $\sqrt{s_{\mathrm{NN}}}=$5.02 TeV

Abstract

The prompt D${}^0$ meson azimuthal anisotropy coefficients, $v_2$ and $v_3$, are measured at midrapidity ($|y|<1.0$) in PbPb collisions at a center-of-mass energy $\sqrt{s_{\mathrm{NN}}}=$5.02 TeV per nucleon pair with data collected by the CMS experiment. The measurement is performed in the transverse momentum ($p_{\mathrm{T}}$) range of 1 to 40 GeV/c, for central and midcentral collisions. The $v_2$ coefficient is found to be positive throughout the $p_{\mathrm{T}}$ range studied. The first measurement of the prompt D${}^0$ meson $v_3$ coefficient is performed, and values up to 0.07 are observed for $p_{\mathrm{T}}$ around 4 GeV/c. Compared to measurements of charged particles, a similar $p_{\mathrm{T}}$ dependence, but smaller magnitude for $p_{\mathrm{T}}<$6 GeV/c, is found for prompt D${}^0$ meson $v_2$ and $v_3$ coefficients. The results are consistent with the presence of collective motion of charm quarks at low $p_{\mathrm{T}}$ and a path length dependence of charm quark energy loss at high $p_{\mathrm{T}}$, thereby providing new constraints on the theoretical description of the interactions between charm quarks and the quark-gluon plasma.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-16-007/ (CMS Public Pages)

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