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

STAR Collaboration,; Adam, J.; Schmitz, N.; Seyboth, P.; et al.,

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

MPS-Authors

STAR Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Adam, J.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Schmitz, N.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Seyboth, P.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

et al.,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

STAR Collaboration, Adam, J., Schmitz, N., Seyboth, P., & et al. (2019). First observation of the directed flow of $D^{0}$ and $\overline{D^0}$ in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV. Physical Review Letters, 123, 162301. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2019-284.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D7D5-8

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 $\sqrt{s_{\rm NN}}$ = 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 ($dv_{1}/dy$), averaged over $D^{0}$ and $\overline{D^{0}}$ mesons, is -0.080 $\pm$ 0.017 (stat.) $\pm$ 0.016 (syst.) for transverse momentum $p_{\rm T}$ above 1.5~GeV/$c$. The absolute value of $D^0$-meson $dv_1/dy$ 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.