The QGP shear viscosity -- elusive goal or just around the corner?
Abstract
With the new viscous hydrodynamic + hadron cascade hybrid code VISHNU, a rather precise (O(25%)) extraction of the QGP shear viscosity (eta/s)_QGP from heavy-ion elliptic flow data is possible if the initial eccentricity of the collision fireball is known with <5% accuracy. At this point, eccentricities from initial state models differ by up to 20%, leading to an O(100%) uncertainty for (eta/s)_QGP. It is shown that a simultaneous comparison of elliptic and triangular flow, v_2 and v_3, puts strong constraints on initial state models and can largely eliminate the present uncertainty in (eta/s)_QGP. The variation of the differential elliptic flow v_2(p_T) for identified hadrons between RHIC and LHC energies provides additional tests of the evolution model.
Keywords
Cite
@article{arxiv.1106.6350,
title = {The QGP shear viscosity -- elusive goal or just around the corner?},
author = {Chun Shen and Steffen A Bass and Tetsufumi Hirano and Pasi Huovinen and Zhi Qiu and Huichao Song and Ulrich W Heinz},
journal= {arXiv preprint arXiv:1106.6350},
year = {2012}
}
Comments
4 pages, 4 figures. Contribution to the proceedings for Quark Matter 2011, to appear in J. Phys. G