Measurement of D0 Azimuthal Anisotropy at Midrapidity in Au+Au Collisions at sNN=200GeV

L. Adamczyk et al. (STAR Collaboration)
Phys. Rev. Lett. 118, 212301 – Published 26 May 2017

Abstract

We report the first measurement of the elliptic anisotropy (v2) of the charm meson D0 at midrapidity (|y|<1) in Au+Au collisions at sNN=200GeV. 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 4GeV/c. The D0 v2 as a function of transverse kinetic energy (mTm0, where mT=pT2+m02) 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. Several theoretical models, with the temperature-dependent, dimensionless charm spatial diffusion coefficient (2πTDs) in the range of 212, are able to simultaneously reproduce our D0 v2 result and our previously published results for the D0 nuclear modification factor.

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  • Received 23 January 2017

DOI:https://doi.org/10.1103/PhysRevLett.118.212301

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 118, Iss. 21 — 26 May 2017

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