Publications [#245301] of Steffen A. Bass

Papers Published
  1. Song, H; Bass, SA; Heinz, U; Hirano, T; Shen, C, 200 A GeV Au + Au collisions serve a nearly perfect quark-gluon liquid., Physical Review Letters, vol. 106 no. 19 (Spring, 2011), pp. 192301 [2783], [doi] .

    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.