Chiral symmetry and the properties of hadrons in the Generalised Nambu-Jona-Lasinio model

TL;DR

This paper reviews the Generalised Nambu-Jona-Lasinio model for QCD, focusing on mesonic excitations, chiral symmetry breaking, and effective symmetry restoration in excited hadrons.

Contribution

It provides a detailed microscopic analysis of chiral symmetry and meson properties within the G-NJL model, highlighting new insights into symmetry restoration at high energies.

Findings

Chiral pion properties are elucidated.

Spontaneous chiral symmetry breaking in the vacuum is characterized.

Effective chiral symmetry restoration occurs in highly excited states.

Abstract

Various aspects of the Generalised Nambu-Jona-Lasinio model for QCD in four dimensions are reviewed. The properties of mesonic excitations are discussed in detail, with special attention paid to the chiral pion. The spontaneous chiral symmetry breaking in the vacuum and the effective chiral symmetry restoration in the spectrum of highly excited mesons and baryons are described microscopically.