Scalar Mesons and Chiral Symmetry

TL;DR

This paper explores the unique features of scalar mesons with vacuum quantum numbers using chiral symmetry and unitarized chiral perturbation theory, including explicit resonance fields and low-energy matching.

Contribution

It introduces a method combining unitarized chiral perturbation theory with explicit resonance fields to study scalar mesons and their chiral symmetry properties.

Findings

Highlights the role of unitarity in scalar meson dynamics

Demonstrates the effectiveness of resonance inclusion in CHPT

Provides insights into the chiral symmetry aspects of scalar mesons

Abstract

It is the purpose of the present manuscript to emphasize those aspects that make the scalar sector with vacuum quantum numbers rather unique. Chiral symmetry is the basic tool for our study together with a resummation of Chiral Perturbation Theory (CHPT) that stresses the role of unitarity but also allows one to include explicit resonance fields and to match with the CHPT expansion at low energies.