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First Observation of the Directed Flow of D^{0} and D^{0}over ¯ in Au+Au Collisions at sqrts_{NN}=200  GeV.

08:00 EDT 18th October 2019 | BioPortfolio

Summary of "First Observation of the Directed Flow of D^{0} and D^{0}over ¯ in Au+Au Collisions at sqrts_{NN}=200  GeV."

We report the first measurement of rapidity-odd directed flow (v_{1}) for D^{0} and D^{0}[over ¯] mesons at midrapidity (|y|<0.8) in Au+Au collisions at sqrt[s_{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 D^{0}[over ¯] mesons, is -0.080±0.017(stat)±0.016(syst) for transverse momentum p_{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 3.4σ 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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This article was published in the following journal.

Name: Physical review letters
ISSN: 1079-7114
Pages: 162301

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