Constraining the initial temperature and shear viscosity in a hybrid hydrodynamic model of sNN=200 GeV Au+Au collisions using pion spectra, elliptic flow, and femtoscopic radii
Abstract
A new framework for evaluating hydrodynamic models of relativistic heavy ion collisions has been developed. This framework, a Comprehesive Heavy Ion Model Evaluation and Reporting Algorithm (CHIMERA) has been implemented by augmenting UVH 2+1D viscous hydrodynamic model with eccentricity fluctuations, pre-equilibrium flow, and the Ultra-relativistic Quantum Molecular Dynamic (UrQMD) hadronic cascade. A range of initial temperatures and shear viscosity to entropy ratios were evaluated for four initial profiles, Npart and Ncoll scaling with and without pre-equilibrium flow. The model results were compared to pion spectra, elliptic flow, and femtoscopic radii from 200 GeV Au+Au collisions for the 0--20% centrality range.Two sets of initial density profiles, Npart scaling with pre-equilibrium flow and Ncoll scaling without were shown to provide a consistent description of all three measurements.