Studying the role of the 't Hooft interaction in QCD, by means of lattice simulations

TL;DR

This paper uses lattice simulations to explore how the 't Hooft interaction influences light quark dynamics in QCD, providing evidence supporting the instanton model and its phenomenological parameters.

Contribution

It presents new lattice simulation results that directly probe the non-perturbative quark-quark interaction and support the instanton-based description of QCD.

Findings

Support for the instanton picture in light quark dynamics

Validation of the phenomenological parameters of the Instanton Liquid Model

Direct evidence of the 't Hooft interaction effects

Abstract

We report on a recent investigation on the dynamics of light quarks, at intermediate and low energy. By measuring some appropriate correlation functions on the lattice, it is possible to probe the Dirac and flavor structure of the non-perturbative quark-quark interaction and look directly for signatures of the 't Hooft Lagrangian. Results obtained with chiral fermions strongly support the instanton picture and the phenomenological parameters of the Instanton Liquid Model