Splitting of elliptic flow in non-central relativistic heavy-ion collisions

TL;DR

This paper predicts a novel splitting of the elliptic flow parameter $v_2$ at non-zero rapidity caused by global vorticity in non-central relativistic heavy-ion collisions, offering a new observable for experimental constraints.

Contribution

It introduces the concept of elliptic flow splitting due to vorticity and demonstrates its potential as an experimental probe using numerical simulations.

Findings

Prediction of $v_2$ splitting at non-zero rapidity

Numerical demonstration using BAMPS model

Potential for experimental constraint on initial vorticity

Abstract

We predict a new effect due to the presence of the global vorticity in non-central relativistic heavy-ion collisions, namely a splitting of the elliptic flow parameter $v_2$ at non-zero rapidity. The size of the splitting is proposed as a new observable that can be used to constrain the initial vortical configuration of the produced QCD matter in experiments. The new findings are demonstrated by numerical calculations employing the parton cascade model, Boltzmann Approach of MultiParton Scatterings (BAMPS), for non-central Au + Au collisions at $\sqrt{s_{NN}} = 200 \ GeV$.