First Observation of the Directed Flow of D0 and D0¯ in Au+Au Collisions at sNN=200GeV

J. Adam et al. (STAR Collaboration)
Phys. Rev. Lett. 123, 162301 – Published 16 October 2019

Abstract

We report the first measurement of rapidity-odd directed flow (v1) for D0 and D0¯ mesons at midrapidity (|y|<0.8) in Au+Au collisions at sNN=200GeV using the STAR detector at the Relativistic Heavy Ion Collider. In 10–80% Au+Au collisions, the slope of the v1 rapidity dependence (dv1/dy), averaged over D0 and D0¯ mesons, is 0.080±0.017(stat)±0.016(syst) for transverse momentum pT above 1.5GeV/c. The absolute value of D0 meson dv1/dy is about 25 times larger than that for charged kaons, with 3.4σ 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.

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  • Received 6 May 2019
  • Revised 9 August 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.162301

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 123, Iss. 16 — 18 October 2019

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