Observation of $D^0$ meson nuclear modifications in Au+Au collisions at $\sqrt{s_{_{\mathrm{NN}}}}$ = 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, $N_{\mathrm{bin}}$, 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 $N_{\mathrm{bin}}$, 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 $p_{\rm T}$ is also observed. Model calculations including strong charm-medium interactions and coalescence hadronization describe our measurements.

  • Table 0

    Data from updated Figure 2 for the p+p collisions. Note, the $\sigma_{NSD}$ = 30$m$b for p+p was used in the plots.


    $D^0$ $p_{\rm T}$ differential invariant yield in p+p collisions (open circles), which has been updated with the latest global analysis...

  • Table 1

    Data from updated Figure 2 for the Au+Au collisions


    Centrality dependence of the $D^0$ $p_{\rm T}$ differential invariant yield in Au+Au collisions (solid symbols). The curves are number-of-binary-collision-scaled Levy...

  • Table 2

    Data from updated Figure 3


    Panels (ab), $D^0$ $R_{\rm AA}$ for peripheral 40$-$80% and semi a central 10$-$40% collisions; Panel (c), $D^0$ $R_{\rm AA}$ for...

  • Table 3

    Data from updated Figure 4


    Integrated $D^0$ $R_{\rm AA}$ as a function of $N_{\mathrm{part}}$ in different $p_{\rm T}$ regions, 0$-$8 ${\mathrm{GeV/}}c$ (squares), 0.7$-$2.2 ${\mathrm{GeV/}}c$ (diamonds)...

Version 3 modifications: Clarification was added about the \sigma=30mb that is used for p+p.

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