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Observation of $D^0$ Meson Nuclear Modifications in Au+Au Collisions at $\sqrt{s_{NN}}=200$ GeV

The STAR collaboration
Phys.Rev.Lett. 113 (2014) 142301, 2014.

Abstract (data abstract)
BNL-RHIC. We report the first measurement of charmed-hadron ($D^0$) production via the hadronic decay channel ($D^0\rightarrow K^- + \pi^+$) in Au+Au collisions at $\sqrt{s_{_{\mathrm{NN}}}}$ = 200\,GeV with the STAR experiment. The charm production cross-section per nucleon-nucleon collision at mid-rapidity scales with the number of binary collisions, $N_{bin}$, from $p$+$p$ to central Au+Au collisions. The $D^0$ meson yields in central Au+Au collisions are strongly suppressed compared to those in $p$+$p$ scaled by $N_{bin}$, for transverse momenta $p_{T}>3$ GeV/$c$, demonstrating significant energy loss of charm quarks in the hot and dense medium. An enhancement at intermediate $p_{T}$ is also observed. Model calculations including strong charm-medium interactions and coalescence hadronization describe our measurements.

  • Table 1

    Data from Figure 2


    Centrality dependence of the $D^0$ $p_T$ differential invariant yield in Au+Au collisions.

  • Table 2

    Data from Figure 3


    $D^0\,R_{AA}$ for different centralities.

  • Table 3

    Data from Figure 4


    Integrated $D^0$ $R_{AA}$ as a function of $N_{part}$ in different $p_T$ regions.

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