Measurement of anisotropic radial flow in relativistic heavy ion collisions

TL;DR

This paper proposes a new method to measure anisotropic radial flow in relativistic heavy ion collisions using azimuthal distribution of mean transverse rapidity, providing a more direct insight into the source’s transverse motion.

Contribution

It introduces a novel measurement approach based on azimuthal mean transverse rapidity distribution, linking it to anisotropic radial flow parameters.

Findings

The azimuthal amplitude of the distribution characterizes anisotropic radial flow.

The method aligns with parameters from generalized blast-wave models.

Demonstrated using AMPT model simulations.

Abstract

We suggest the azimuthal distribution of mean transverse (radial) rapidity of the final state particles as a more direct measure of the transverse motion of the source than the standard azimuthal multiplicity distribution. Using a sample generated by the AMPT model with string melting, we demonstrate that the azimuthal amplitude of the suggested distribution characterizes the anisotropic radial flow, and coincides with the parameter of anisotropic radial rapidity extracted from a generalized blast-wave parametrization.