First observation of the directed flow of $D^0$ and $\overline{D^0}$ in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200~GeV

Abstract

We report the first measurement of rapidity-odd directed flow ($v_1$) for $D^0$ and $\overline{D^0}$ mesons at mid-rapidity ($|y|<0.8$) in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200\,GeV using the STAR detector at the Relativistic Heavy Ion Collider. In 10--80\% Au+Au collisions, the slope of the $v_1$ rapidity dependence ($d{v}_1/dy$), averaged over $D^0$ and $\overline{D^0}$ mesons, is -0.080 $\pm$ 0.017 (stat.) $\pm$ 0.016 (syst.) for transverse momentum $p_{\mathrm{T}}$ above 1.5~GeV/$c$. The absolute value of $D^0$-meson $d{v}_1/dy$ is about 25 times larger than that for charged kaons, with 3.4$\sigma$ significance. These data give a unique insight into the initial tilt of the produced matter, and offer constraints on the geometric and transport parameters of the hot QCD medium created in relativistic heavy-ion collisions.

Submitted to Phys. Rev. Lett

References in corpus (6)

• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Observation of $D^0$ meson nuclear modifications in Au+Au collisions at $\sqrt{s_{{}_{\mathrm{NN}}}}$ = 200 GeV
• Directed flow in ultrarelativistic heavy-ion collisions
• Azimuthal anisotropy of D meson production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• System-size independence of directed flow at the Relativistic Heavy-Ion Collider
• Centrality and transverse momentum dependence of $D^0$-meson production at mid-rapidity in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200\mathrm{GeV}$

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