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Title: Measurement of D0 Azimuthal Anisotropy at Midrapidity in Au + Au Collisions at s N N = 200 GeV

Journal Article · · Physical Review Letters
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In this paper, we report the first measurement of the elliptic anisotropy (v2) of the charm meson D0 at midrapidity (|y| < 1) in Au + Au collisions at $$\sqrt{s}$$$$_ {NN}$$ = 200 GeV. The measurement was conducted by the STAR experiment at RHIC utilizing a new high-resolution silicon tracker. The measured D0 v2 in 0%–80% centrality Au + Au collisions can be described by a viscous hydrodynamic calculation for a transverse momentum (pT) of less than 4 GeV/c . The D0 v2 as a function of transverse kinetic energy (mT - m0 , where m T = $$\sqrt{p}$$$$2\atop{T}$$ + m$$2\atop{0}$$) is consistent with that of light mesons in 10%–40% centrality Au + Au collisions. These results suggest that charm quarks have achieved local thermal equilibrium with the medium created in such collisions. In conclusion, several theoretical models, with the temperature-dependent, dimensionless charm spatial diffusion coefficient (2πTDs) in the range of ~2–12 , are able to simultaneously reproduce our D0 v2 result and our previously published results for the D0 nuclear modification factor.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). Relativistic Heavy Ion Collider (RHIC); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of Illinois, Chicago, IL (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
STAR Collaboration
Grant/Contract Number:
SC0012704; FG02-94ER40865; AC02-05CH11231
OSTI ID:
1376107
Alternate ID(s):
OSTI ID: 1372580; OSTI ID: 1393237; OSTI ID: 1666125; OSTI ID: 1666254
Report Number(s):
BNL-113964-2017-JA; R&D Project: PO 004; KB0202012; TRN: US1702798
Journal Information:
Physical Review Letters, Vol. 118, Issue 21; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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