Influence of temperature dependent shear viscosity on elliptic flow at back- and forward rapidities in ultrarelativistic heavy-ion collisions

Molnar, Etele and Holopainen, H. and Huovinen, P. and Niemi, H. (2014) Influence of temperature dependent shear viscosity on elliptic flow at back- and forward rapidities in ultrarelativistic heavy-ion collisions. PHYSICAL REVIEW C, 90 (4). ISSN 2469-9985

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Abstract

We explore the influence of a temperature-dependent shear viscosity over entropy density ratio ηs/s on the azimuthal anisotropies v2 and v4 of hadrons at various rapidities. We find that in Au + Au collisions at full Relativistic Heavy Ion Collider energy, √sNN = 200 GeV, the flow anisotropies are dominated by hadronic viscosity at all rapidities, whereas in Pb + Pb collisions at the Large Hadron Collider energy, √sNN = 2760 GeV, the flow coefficients are affected by the viscosity in both the plasma and hadronic phases at midrapidity, but the further away from midra- pidity, the more dominant the hadronic viscosity becomes. We find that the centrality and rapidity dependence of the elliptic and quadrangular flows can help to distinguish different parametrizations of (ηs/s)(T ). We also find that at midrapidity the flow harmonics are almost independent of the decoupling criterion, but show some sensitivity to the criterion at back- and forward rapidities.

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