Parity-odd effects in heavy-ion collisions in the HSD model

TL;DR

This paper investigates parity-odd effects, specifically helicity separation, in non-central heavy-ion collisions using the HSD model, analyzing the time evolution and final state particles to identify potential parity violation signals.

Contribution

It introduces a novel analysis method for final state particles to probe parity-odd effects in heavy-ion collisions within the HSD framework.

Findings

Hydrodynamic helicity varies with impact parameter and time.

Comparison with previous studies validates the simulation approach.

A new quantity effectively probes parity-odd effects in the final state.

Abstract

Helicity separation effect in non-central heavy ion collisions is investigated using the Hadron-String Dynamics (HSD) model. Computer simulations are done to calculate velocity and hydrodynamic helicity on a mesh in a small volume around the center of the reaction. The time dependence of hydrodynamic helicity is observed for various impact parameters and different calculation methods. Comparison with a similar earlier work is carried out. A new quantity is used to ananlyze particles in the final state. It is used to probe for p-odd effects in the final state.