Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

4-2007

Journal or Book Title

Physical Review Letters

Volume

98

Issue

17

First Page

172301

DOI

10.1103/PhysRevLett.98.172301

Abstract

The PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC) has measured electrons with 0.3 < p(T) < 9 GeV/c at midrapidity (\y\ < 0.35) from heavy-flavor (charm and bottom) decays in Au + Au collisions at root s(NN) = 200 GeV. The nuclear modification factor R-AA relative to p + p collisions shows a strong suppression in central Au + Au collisions, indicating substantial energy loss of heavy quarks in the medium produced at RHIC energies. A large azimuthal anisotropy v(2) with respect to the reaction plane is observed for 0.5 < p(T) < 5 GeV/c indicating substantial heavy-flavor elliptic flow. Both R-AA and v(2) show a p(T) dependence different from those of neutral pions. A comparison to transport models which simultaneously describe R-AA(p(T)) and v(2)(p(T)) suggests that the viscosity to entropy density ratio is close to the conjectured quantum lower bound, i.e., near a perfect fluid.

Comments

This article is published as Adare, A., S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander et al. "Energy loss and flow of heavy quarks in Au+ Au collisions at s NN= 200 GeV." Physical Review Letters 98, no. 17 (2007): 172301. DOI:10.1103/PhysRevLett.98.172301. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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