Helicity separation in Heavy-Ion Collisions

TL;DR

This paper investigates P-odd effects related to vorticity in noncentral heavy-ion collisions, revealing vortical structures and helicity behaviors that vary with collision energy, especially prominent at NICA and FAIR energies.

Contribution

It provides numerical simulations of vorticity and helicity in heavy-ion collisions, highlighting the presence of vortical structures and their mirror behaviors relative to the reaction plane.

Findings

Vortical structures occupy small fractions of the fireball volume.

Noticeable hydrodynamical helicity exhibits mirror behavior with respect to the reaction plane.

Helicity effects are maximal at NICA and FAIR energy ranges.

Abstract

We study the P-odd effects related to the vorticity of the medium formed in noncentral heavy ion collisions. Using the kinetic Quark-Gluon Strings Model we perform the numerical simulations of the vorticity and hydrodynamical helicity for the various atomic numbers, energies and centralities. We observed the vortical structures typically occupying the relatively small fraction of the fireball volume. In the course of numerical simulations the noticeable hydrodanamical helicity was observed manifesting the specific mirror behaviour with respect to the reaction plane. The effect is maximal at the NICA and FAIR energy range.