Chiral perturbation theory

TL;DR

Chiral perturbation theory (ChPT) is an effective field theory that models low-energy hadronic interactions using hadrons as degrees of freedom, providing a systematic approximation based on quark masses and momenta.

Contribution

This paper provides a concise overview of ChPT, highlighting its systematic, model-independent approach for describing strongly-interacting systems at low energies.

Findings

ChPT effectively describes low-energy hadron properties.

It offers a systematic expansion in quark masses and momenta.

The approach is model-independent and broadly applicable.

Abstract

Chiral perturbation theory (ChPT) is an effective field theory that describes the properties of strongly-interacting systems at energies far below typical hadron masses. The degrees of freedom are hadrons instead of the underlying quarks and gluons. ChPT is a systematic and model-independent approximation method based on an expansion of amplitudes in terms of light-quark masses and momenta. The following is a brief overview of ChPT that is largely based on Scherer, Schindler, Lect. Notes Phys. 830 (2012), which can be referred to for a more detailed introduction.