Chiral symmetry and resonances in QCD

TL;DR

This paper investigates how resonances form in QCD using chiral SU(3) Lagrangian, predicting known and new resonances through unitarized scattering amplitudes with a focus on light axial-vector mesons.

Contribution

It provides parameter-free leading order predictions for meson-hadron scattering and details the properties of light axial-vector mesons, recovering known resonances and predicting new ones.

Findings

Recovered many empirically established resonances.

Predicted so far unseen resonances.

Provided detailed properties of light axial-vector mesons.

Abstract

We study the formation of resonances in terms of the chiral SU(3) Lagrangian. At leading order parameter-free predictions are obtained for the scattering of Goldstone bosons off any hadron once we insist on approximate crossing symmetry of the unitarized scattering amplitude. A wealth of empirically established resonances are recovered and so far unseen resonances are predicted. Here we review in some detail the properties of light axial-vector mesons.