title: Influence of shear viscosity of quark-gluon plasma on elliptic flow in ultrarelativistic heavy-ion collisions.
abstract: We investigate the influence of a temperature-dependent shear viscosity over entropy density ratio η/s on the transverse momentum spectra and elliptic flow of hadrons in ultrarelativistic heavy-ion collisions. We find that the elliptic flow in √S(NN)=200  GeV Au+Au collisions at RHIC is dominated by the viscosity in the hadronic phase and in the phase transition region, but largely insensitive to the viscosity of the quark-gluon plasma (QGP). At the highest LHC energy, the elliptic flow becomes sensitive to the QGP viscosity and insensitive to the hadronic viscosity.
authors.affiliation: Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, D-60438 Frankfurt am Main, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Niemi
authors.forename: G S
authors.initials: GS
authors.lastname: Denicol
authors.forename: P
authors.initials: P
authors.lastname: Huovinen
authors.forename: E
authors.initials: E
authors.lastname: Molnár
authors.forename: D H
authors.initials: DH
authors.lastname: Rischke