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Peter Christiansen Profile

Peter Christiansen

Professor

Peter Christiansen Profile

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

Author

  • R. Averbeck
  • Peter Christiansen
  • Hans-Åke Gustafsson
  • Eva Haslum
  • Anders Oskarsson
  • Sarah Rosendahl
  • Evert Stenlund

Summary, in English

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.

Department/s

  • Particle and nuclear physics

Publishing year

2008

Language

English

Publication/Series

Journal of Physics G: Nuclear and Particle Physics

Volume

35

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0954-3899