Energy Loss and Flow of Heavy Quarks in Au + Au Collisions at sqrt(s_NN) = 200 GeV
- ORNL
- University of Tennessee, Knoxville (UTK) & Oak Ridge National Laboratory (ORNL)
- University of Tennessee, Knoxville (UTK)
The PHENIX experiment at the BNL Relativistic Heavy Ion Collider (RHIC) has measured electrons with 0.3<p{sub T}<9 GeV/c at midrapidity (|y|<0.35) from heavy-flavor (charm and bottom) decays in Au+Au collisions at {radical}(s{sub NN})=200 GeV. The nuclear modification factor R{sub 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 v2 with respect to the reaction plane is observed for 0.5<p{sub T}<5 GeV/c indicating substantial heavy-flavor elliptic flow. Both R{sub AA} and v{sub 2} show a p{sub T} dependence different from those of neutral pions. A comparison to transport models which simultaneously describe R{sub AA}(p{sub T}) and v{sub 2}(p{sub T}) suggests that the viscosity to entropy density ratio is close to the conjectured quantum lower bound, i.e., near a perfect fluid.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 931514
- Journal Information:
- Physical Review Letters, Vol. 98, Issue 17; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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