Towards a quantum theory of chiral magnetic effect

TL;DR

This paper explores three theoretical approaches to understanding the quantum physics of the chiral magnetic effect and charge fluctuations in heavy ion collisions, analyzing their implications and calculating relevant form-factors.

Contribution

It introduces three distinct frameworks for analyzing the quantum aspects of the chiral magnetic effect, including form-factor calculations in different regimes.

Findings

Charge fluctuation asymmetry saturates at large magnetic fields for free fermions.

The effect is negligible in the P-parity violation approach.

Form-factors are computed for weak and strong magnetic field regimes.

Abstract

We discuss three possible ways to address quantum physics behind chiral magnetic effect and electric charge fluctuation patterns in heavy ion collisions. The first one makes use of P-parity violation probed by local order parameters, the second considers CME in quantum measurement theory framework and the third way is to study P-odd * P-odd contributions to P-even observables. In the latter approach relevant form-factor is extracted and computed for weak magnetic field in confinement region and for free quarks in strong field regime. It is shown that the effect is negligible in the former case. We also discuss saturation effect - charge fluctuation asymmetry for free fermions reaches constant value at asymptotically large fields.