Estimating ?/s of QCD matter at high baryon densities

15th International Conference on Strangeness in Quark Matter

Karpenko, I.^1,2 ; Bleicher, M.^1,3 ; Huovinen, P.^1,3 ; Petersen, H.^1,3,4

Frankfurt Institute for Advanced Studies, Ruth-Moufang-Straße 1, Frankfurt am Main

60438, Germany^1

Bogolyubov Institute for Theoretical Physics, 14-b, Metrolohichna st., Kiev

03680, Ukraine^2

Institute for Theoretical Physics, Johann Wolfgang Goethe Universität, Max-von-Laue-Str. 1, Frankfurt am Main

60438, Germany^3

GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, Darmstadt

64291, Germany^4

关键词: Baryon density;    Beam energies;    CASCADE model;    Collision energies;    Constraining models;    Entropy density;    Heavy ion collision;    Scan range;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/668/1/012063/pdf
DOI  :  10.1088/1742-6596/668/1/012063

来源: IOP

【 摘 要 】

We report on the application of a cascade + viscous hydro + cascade model for heavy ion collisions in the RHIC Beam Energy Scan range, √snn = 6.3...200 GeV. By constraining model parameters to reproduce the data we find that the effective (average) value of the shear viscosity over entropy density ratio η/s decreases from 0.2 to 0.08 when collision energy grows from √sNN ≈ 7 to 39 GeV.