Elliptic Flow and Shear Viscosity within a Transport Approach from RHIC to LHC Energy

TL;DR

This paper investigates how elliptic flow develops in ultra-relativistic heavy ion collisions using a transport model with fixed and temperature-dependent shear viscosity to understand collective flow behaviors at RHIC and LHC energies.

Contribution

It introduces a transport approach that incorporates temperature-dependent shear viscosity to accurately describe elliptic flow across different collision energies.

Findings

Transport model successfully describes the rise, fall, and saturation of v_2(p_T) at LHC.

Temperature dependence of ta/s(T) influences elliptic flow generation.

Model aligns with experimental data from RHIC and LHC.

Abstract

We have investigated the build up of anisotropic flows within a parton cascade approach at fixed shear viscosity to entropy density \eta/s to study the generation of collective flows in ultra-relativistic heavy ion collisions. We present a study of the impact of a temperature dependent \eta/s(T) on the generation of the elliptic flow at both RHIC and LHC. Finally we show that the transport approach, thanks to its wide validity range, is able to describe naturally the rise - fall and saturation of the v_2(p_T) observed at LHC.