Viscosity from elliptic flow: the path to precision

TL;DR

This paper demonstrates that analyzing the impact parameter dependence of elliptic flow in viscous hydrodynamics can accurately determine the initial source eccentricity, thereby reducing uncertainties in measuring the matter's viscosity in heavy-ion collisions.

Contribution

It introduces a method to distinguish initial eccentricity models using elliptic flow data, improving precision in viscosity extraction.

Findings

Impact parameter dependence helps differentiate initial eccentricity models.

Reduces uncertainty in extracting the specific viscosity of quark-gluon plasma.

Provides a pathway for more precise characterization of the created matter.

Abstract

Using viscous relativistic hydrodynamics we show that systematic studies of the impact parameter dependence of the eccentricity scaled elliptic flow can distinguish between different models for the calculation of the initial source eccentricity. This removes the largest present uncertainty in the extraction of the specific viscosity of the matter created in relativistic heavy-ion collisions from precise elliptic flow measurements.