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Extracting the shear viscosity of a high temperature hadron gas
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Quark-Gluon plasmas produced in relativistic heavy-ion collisions quickly expand and cool, entering a phase consisting of multiple interacting hadronic resonances just below the QCD deconfinement temperature. The transport properties of this hot hadron gas are poorly understood, yet they play an important role in our ability to infer transport properties of the quark-gluon plasma, because experimental measurements integrate over the whole system evolution. Assuming that the hot hadron gas can be modeled by a hadron cascade code based on kinetic theory assuming binary interactions, the shear viscosity over entropy ratio of a hot hadron gas for temperatures in between 120 MeV and 170 MeV is extracted. Furthermore, we present estimates for a second order transport coefficient, the shear viscous relaxation time at a temperature of 165 MeV.
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Cited by 1 Pith paper
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Viscous coefficients and thermal conductivity of a $\pi K N$ gas mixture in the medium
Transport coefficients of a hot πKN gas are computed with in-medium cross sections from thermal field theory, showing medium effects increase relaxation times and modify η, ζ, and λ.
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