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

doi:10.1103/PhysRevLett.123.162301

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

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

Physical Review Letters, Vol.123(16), 162301

123

10/16/2019

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

PMID: 31702332

Abstract

Physics and Astronomy(all)

We report the first measurement of rapidity-odd directed flow (v1) for D0 and D0̄ mesons at midrapidity (|y|<0.8) in Au+Au collisions at sNN=200 GeV 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 D0̄ mesons, is -0.080±0.017(stat)±0.016(syst) for transverse momentum pT above 1.5 GeV/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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Title: First Observation of the Directed Flow of D0 and D0 ̄ in Au+Au Collisions at sNN =200 GeV
Publication Details: Physical Review Letters, Vol.123(16), 162301
Series: 123
Grant note: We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at LBNL, and the Open Science Grid consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science, the U.S. National Science Foundation, the Ministry of Education and Science of the Russian Federation, National Natural Science Foundation of China, Chinese Academy of Science, the Ministry of Science and Technology of China and the Chinese Ministry of Education, the National Research Foundation of Korea, Czech Science Foundation and Ministry of Education, Youth and Sports of the Czech Republic, Hungarian National Research, Development and Innovation Office, New National Excellency Programme of the Hungarian Ministry of Human Capacities, Department of Atomic Energy and Department of Science and Technology of the Government of India, the National Science Centre of Poland, the Ministry of Science, Education and Sports of the Republic of Croatia, RosAtom of Russia and German Bundesministerium fur Bildung, Wissenschaft, Forschung and Technologie (BMBF) and the Helmholtz Association.
Identifiers: 991005930970502656
Academic Unit: Physics
Language: English
Resource Type: Journal article

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

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