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The viscosity to entropy ratio from PHENIX data on single electron production

Averbeck, R.; Christiansen, Peter LU ; Gustafsson, Hans-Åke LU ; Haslum, Eva LU ; Oskarsson, Anders LU ; Rosendahl, Sarah LU and Stenlund, Evert LU (2008) In Journal of Physics G: Nuclear and Particle Physics 35.
Abstract
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 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 pT and a large azimuthal anisotropy v2 of such electrons in Au + Au collisions at RHIC. By requiring a simultaneous description of the nuclear modification factor RAA(pT) and the azimuthal anisotropy v2(pT) in transport models, the viscosity to entropy density ratio of the medium can be estimated as η/s (1.3–2)(1/4π), which is close to the conjectured lower quantum bound and, therefore, near a perfect fluid.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics G: Nuclear and Particle Physics
volume
35
publisher
IOP Publishing
external identifiers
  • scopus:54749095094
ISSN
0954-3899
DOI
10.1088/0954-3899/35/10/104115
language
English
LU publication?
yes
id
f100469b-69cd-4359-8883-7c67f57b5549 (old id 1432140)
date added to LUP
2009-08-05 09:47:53
date last changed
2017-01-01 06:00:28
@article{f100469b-69cd-4359-8883-7c67f57b5549,
  abstract     = {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 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 pT and a large azimuthal anisotropy v2 of such electrons in Au + Au collisions at RHIC. By requiring a simultaneous description of the nuclear modification factor RAA(pT) and the azimuthal anisotropy v2(pT) in transport models, the viscosity to entropy density ratio of the medium can be estimated as η/s (1.3–2)(1/4π), which is close to the conjectured lower quantum bound and, therefore, near a perfect fluid.},
  articleno    = {104115},
  author       = {Averbeck, R. and Christiansen, Peter and Gustafsson, Hans-Åke and Haslum, Eva and Oskarsson, Anders and Rosendahl, Sarah and Stenlund, Evert},
  issn         = {0954-3899},
  language     = {eng},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics G: Nuclear and Particle Physics},
  title        = {The viscosity to entropy ratio from PHENIX data on single electron production},
  url          = {http://dx.doi.org/10.1088/0954-3899/35/10/104115},
  volume       = {35},
  year         = {2008},
}