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Title: First Observation of the Directed Flow of D 0 and D 0 ¯ in Au + Au Collisions at s N N = 200 GeV

Journal Article · · Physical Review Letters
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We report the first measurement of rapidity-odd directed flow ($$v_{1}$$) for $$D^{0}$$ and $$\overline{D^{0}}$$ 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 $$\overline{D^{0}}$$ 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.

Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Texas A & M Univ., College Station, TX (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); Ministry of Education and Science of the Russian Federation; National Natural Science Foundation of China (NSFC); Chinese Academy of Science (CAS); National Research Foundation of Korea (NRF); Czech Science Foundation and Ministry of Education; National Science Centre of Poland; Ministry of Science, Education and Sports of the Republic of Croatia, RosAtom of Russia; German Bundesministerium fur Bildung, Wissenschaft, Forschung and Technologie (BMBF); Helmholtz Association; Chinese Academy of Sciences (CAS); Ministry of Science and Technology of the People’s Republic of China; Ministry of Education of China; Czech Science Foundation (GACR); Ministry of Education, Youth and Sports of the Czech Republic; Hungarian National Research, Development and Innovation Office (NRDI); Hungarian Ministry of Human Capacities; Government of India; National Science Centre of Poland (NCN); Ministry of Science, Education and Sports of the Republic of Croatia; ROSATOM of Russia; German Federal Ministry of Education and Research (BMBF)
Contributing Organization:
STAR Collaboration
Grant/Contract Number:
AC02-05CH11231; SC0015636; SC0012704; SC0017982
OSTI ID:
1574340
Alternate ID(s):
OSTI ID: 1523248; OSTI ID: 1594833; OSTI ID: 1787615
Report Number(s):
BNL-211628-2019-JAAM; PRLTAO; ark:/13030/qt9228t1ff; TRN: US2100198
Journal Information:
Physical Review Letters, Vol. 123, Issue 16; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 31 works
Citation information provided by
Web of Science

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Influence of electromagnetic fields in proton-nucleus collisions at relativistic energy journal January 2020


Figures / Tables (3)


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