Light Hadron Spectrum in the Instanton Liquid Model

TL;DR

This paper reviews how instanton-induced chiral interactions explain the ordering and realistic masses of light hadrons, including mesons, baryons, and glueballs, within the instanton liquid model.

Contribution

It demonstrates that the instanton liquid model can account for the spectrum and structure of the lowest-lying light hadrons with realistic mass predictions.

Findings

All studied hadrons are bound with realistic masses.

The instanton-induced interactions explain the ordering of meson and baryon excitations.

The model successfully describes scalar glueball properties.

Abstract

We review our recent study of the role played by the chiral interactions induced by instantons, in the lowest-lying sector of the light hadron spectrum. We discuss how the ordering of the lowest meson and baryon excitations is explained by the structure of the instanton-induced quark-quark and gluon-gluon interaction. We focus on the pion, nucleon, vector- and axial-vector mesons, and on the scalar glueball. We find that all these hadrons are bound in this model and have realistic masses.