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

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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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Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Subatomär fysik
Originalspråkengelska
Artikelnummer104115
TidskriftJournal of Physics G: Nuclear and Particle Physics
Volym35
StatusPublished - 2008
PublikationskategoriForskning
Peer review utfördJa