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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
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics G: Nuclear and Particle Physics
volume
35
article number
104115
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
2016-04-01 14:01:03
date last changed
2023-03-19 05:25:39
@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.}},
  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}},
  doi          = {{10.1088/0954-3899/35/10/104115}},
  volume       = {{35}},
  year         = {{2008}},
}