# Measurement of prompt $D^0$ meson azimuthal anisotropy in Pb-Pb collisions at $\sqrt{^s{NN}}$ = 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 Pb-Pb collisions at a center-of-mass energy $\sqrt s_{NN}=5.02 TeV$ per nucleon pair with data collected by the CMS experiment. The measurement is performed in the transverse momentum $(p_T)$ range of 1 to $40 GeV/c$, for central and midcentral collisions. The $v^2$ coefficient is found to be positive throughout the $p_T$ 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 $p_T$ around $4 GeV/c$. Compared to measurements of charged particles, a similar $p_T$ dependence, but smaller magnitude for ${p_T}<6 GeV/c$, 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 $p_T$ and a path length dependence of charm quark energy loss at high $p_T$, thereby providing new constraints on the theoretical description of the interactions between charm quarks and the quark-gluon plasma.

## Abstract

The prompt $D^0$ meson azimuthal anisotropy coefficients, $v_2$ and $v_3$, are measured at midrapidity $(|y|<1.0)$ in Pb-Pb collisions at a center-of-mass energy $\sqrt s_{NN}=5.02 TeV$ per nucleon pair with data collected by the CMS experiment. The measurement is performed in the transverse momentum $(p_T)$ range of 1 to $40 GeV/c$, for central and midcentral collisions. The $v^2$ coefficient is found to be positive throughout the $p_T$ 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 $p_T$ around $4 GeV/c$. Compared to measurements of charged particles, a similar $p_T$ dependence, but smaller magnitude for ${p_T}<6 GeV/c$, 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 $p_T$ and a path length dependence of charm quark energy loss at high $p_T$, thereby providing new constraints on the theoretical description of the interactions between charm quarks and the quark-gluon plasma.

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