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Measurement of D0 Azimuthal Anisotropy at Midrapidity in Au+Au Collisions at sNN =200 GeV
Adamczyk, L Adkins, JK Agakishiev, G Aggarwal, MM Ahammed, Z Ajitanand, NN Alekseev, I Anderson, DM Aoyama, R Aparin, A
Adamczyk, L
Adkins, JK
Agakishiev, G
Aggarwal, MM
Ahammed, Z
Ajitanand, NN
Alekseev, I
Anderson, DM
Aoyama, R
Aparin, A
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Pre-print
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2017-05-26
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10.1103/PhysRevLett.118.212301
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© 2017 American Physical Society. 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=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 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 ∼2-12, are able to simultaneously reproduce our D0 v2 result and our previously published results for the D0 nuclear modification factor.
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Physical Review Letters
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