Event-by-event fluctuations in a perturbative QCD + saturation + hydrodynamics model: Determining QCD matter shear viscosity in ultrarelativistic heavy-ion collisions

This paper introduces an event-by-event perturbative QCD plus saturation framework for the initial state of high-energy heavy-ion collisions and evolves the matter using dissipative fluid dynamics. The results favor a ratio of shear viscosity-to-entropy density that has a minimum near a temperature of 150 MeV, in line with theoretical expectations.