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Published on: May 25, 2021
Viscosities of the Baryon-Rich Quark-Gluon Plasma from Beam Energy Scan Data
Chun Shen1,2, Björn Schenke3, Wenbin Zhao1,4,5
1Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, USA.
Abstract:
This work presents the first Bayesian inference study of the (3+1)D dynamics of relativistic heavy-ion collisions and quark-gluon plasma viscosities using an event-by-event (3+1)D hydrodynamics+hadronic transport theoretical framework and data from the Relativistic Heavy Ion Collider Beam energy scan program. Robust constraints on initial state nuclear stopping and the baryon chemical potential-dependent shear viscosity of the produced quantum chromodynamic (QCD) matter are obtained. The specific bulk viscosity of the QCD matter is found to exhibit a preferred maximum around sqrt[s_{NN}]=19.6 GeV. This result allows for the alternative interpretation of a reduction (and/or increase) of the speed of sound relative to that of the employed lattice-QCD based equation of state for net baryon chemical potential μ_{B}∼0.2(0.4) GeV.
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