200 A GeV Au + Au collisions serve a nearly perfect quark-gluon liquid.


Journal Article

A new robust method to extract the specific shear viscosity (η/s)(QGP) of a quark-gluon plasma (QGP) at temperatures T(c) < T ≲ 2T(c) from the centrality dependence of the eccentricity-scaled elliptic flow v2/ε measured in ultrarelativistic heavy-ion collisions is presented. Coupling viscous fluid dynamics for the QGP with a microscopic transport model for hadronic freeze-out we find for 200 A GeV Au + Au collisions that v2/ε is a universal function of multiplicity density (1/S)(dN(ch)/dy) that depends only on the viscosity but not on the model used for computing the initial fireball eccentricity ε. Comparing with measurements we find 1<4π(η/s)(QGP) < 2.5 where the uncertainty range is dominated by model uncertainties for the values of ε used to normalize the measured v2.

Full Text

Duke Authors

Cited Authors

  • Song, H; Bass, SA; Heinz, U; Hirano, T; Shen, C

Published Date

  • May 9, 2011

Published In

Volume / Issue

  • 106 / 19

Start / End Page

  • 192301 -

PubMed ID

  • 21668145

Pubmed Central ID

  • 21668145

Electronic International Standard Serial Number (EISSN)

  • 1079-7114

International Standard Serial Number (ISSN)

  • 0031-9007

Digital Object Identifier (DOI)

  • 10.1103/physrevlett.106.192301


  • eng