The viscosity to entropy density ratio from PHENIX data on single electron production
- Stony Brook University (SUNY)
- ORNL
- Lawrence Livermore National Laboratory (LLNL)
- University of Tennessee, Knoxville (UTK)
The PHENIX experiment has measured electrons from the decay of hadrons carrying heavy flavor (charm or bottom quarks) in p + p and Au + Au collisions at {radical}s{sub NN} = 200 GeV at the Relativistic Heavy Ion Collider (RHIC). The strong damping of heavy-flavor motion through the medium is reflected in a substantial suppression at high p{sub T} and a large azimuthal anisotropy {upsilon}{sub 2} of such electrons in Au + Au collisions at RHIC. By requiring a simultaneous description of the nuclear modification factor R{sub AA}(p{sub T}) and the azimuthal anisotropy {upsilon}{sub 2}(p{sub T}) in transport models, the viscosity to entropy density ratio of the medium can be estimated as {eta}/s {approx} (1.3-2)(1/4{pi}), which is close to the conjectured lower quantum bound and, therefore, 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:
- 946116
- Resource Relation:
- Conference: 20th International Conference on Nucleus Nucleus Collisions/Quark Matter 2008, Jaipur, India, 20080204, 20080210
- Country of Publication:
- United States
- Language:
- English
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