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Phys Rev Lett. 2016 May 27;116(21):212301. doi: 10.1103/PhysRevLett.116.212301. Epub 2016 May 26.

Moving Forward to Constrain the Shear Viscosity of QCD Matter.

Author information

1
Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA.
2
RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA.

Abstract

We demonstrate that measurements of rapidity differential anisotropic flow in heavy-ion collisions can constrain the temperature dependence of the shear viscosity to entropy density ratio η/s of QCD matter. Comparing results from hydrodynamic calculations with experimental data from the RHIC, we find evidence for a small η/s≈0.04 in the QCD crossover region and a strong temperature dependence in the hadronic phase. A temperature independent η/s is disfavored by the data. We further show that measurements of the event-by-event flow as a function of rapidity can be used to independently constrain the initial state fluctuations in three dimensions and the temperature dependent transport properties of QCD matter.

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