The Chiral Separation Effect from lattice QCD at the physical point

TL;DR

This study uses lattice QCD simulations to analyze the Chiral Separation Effect at the physical point, revealing temperature-dependent behavior of conductivity and emphasizing the importance of conserved currents.

Contribution

First lattice QCD determination of the continuum limit of the Chiral Separation Effect conductivity with physical quark masses and comparison of dynamical and quenched approximations.

Findings

Conductivity suppressed in the confined phase

Conductivity approaches perturbative values at high temperatures

Impact of quenched approximation on results

Abstract

In this paper we study the Chiral Separation Effect by means of first-principles lattice QCD simulations. For the first time in the literature, we determine the continuum limit of the associated conductivity using 2+1 flavors of dynamical staggered quarks at physical masses. The results reveal a suppression of the conductivity in the confined phase and a gradual enhancement toward the perturbative value for high temperatures. In addition to our dynamical setup, we also investigate the impact of the quenched approximation on the conductivity, using both staggered and Wilson quarks. Finally, we highlight the relevance of employing conserved vector and anomalous axial currents in the lattice simulations.