Abstract
A 3+1 dimensional event-by-event viscous hydrodynamic + cascade model is applied for the simulation of heavy ion collision reactions at = 6.3... 200 GeV. UrQMD cascade is used for the pre-thermal (pre-hydro) and final (post-hydro) stages of the reaction. The baryon, as well as electric charge densities are consistently taken into account in the model. For this aim the equation of state based on a Chiral model coupled to the Polyakov loop is used in hydrodynamic phase of evolution.As a result of the model adjustment to the experimental data, the effective values of the shear viscosity over entropy density η/s are obtained for different collision energies in the BES region. A decrease of the effective values of η/s from 0.2 to 0.08 is observed as collision energy increases from ≈ 7 to 39 GeV.
Highlights
To accommodate the model for a given collision energy range, the initial conditions for hydrodynamic phase are taken from Ultrarelativistic Quantum Molecular Dynamics (UrQMD), and the equation of state at finite baryon density is based on Chiral model coupled to the Polyakov loop
Hydrodynamic approach is well established for description of hot and dense matter created in ultrarelativistic heavy ion collisions at BNL Relativistic Heavy Ion Collider (RHIC) and CERN Large Hadron Collider (LHC)
In this paper we report on the application of the viscous+cascade model tuned to full RHIC energy to heavy ion collisions at lower collision energies
Summary
Hydrodynamic approach is well established for description of hot and dense matter created in ultrarelativistic heavy ion collisions at BNL Relativistic Heavy Ion Collider (RHIC) and CERN Large Hadron Collider (LHC). To accommodate the model for a given collision energy range, the initial conditions for hydrodynamic phase are taken from UrQMD, and the equation of state at finite baryon density is based on Chiral model coupled to the Polyakov loop. We study the collision energy dependence of pion and kaon rapidity distributions and mT spectra, as well as charged hadron elliptic flow and how shear viscosity affects them.
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