Low Lying Scalar Resonances and Chiral Symmetry

TL;DR

This paper reviews theoretical evidence supporting the interpretation of the sigma meson as the chiral partner of Nambu-Goldstone bosons within a linear chiral symmetry framework.

Contribution

It consolidates current theoretical studies and emphasizes the consistency of evidence for the sigma meson as a chiral partner in linear chiral symmetry realization.

Findings

Evidence supports sigma as chiral partner of Nambu-Goldstone bosons

Current studies align with linear chiral symmetry models

The sigma resonance is consistent with chiral symmetry expectations

Abstract

Current theoretical studies on the $\sigma$ and $\kappa$ resonances are reviewed. It is emphasized that all evidences accumulated so far are consistent with the picture that the $\sigma$ meson is the chiral partner of the Nambu--Goldstone bosons in a linear realization of chiral symmetry.