The role of resonances in non-leptonic hyperon decays

TL;DR

This paper investigates how resonances influence non-leptonic hyperon decays using chiral perturbation theory, incorporating resonances into the effective theory and fitting decay amplitudes to match experimental data.

Contribution

It introduces a resonance saturation scheme within chiral perturbation theory to estimate coupling constants and improve decay amplitude predictions.

Findings

Reasonable agreement with experimental decay amplitudes achieved.

Higher order counterterms derived from resonance integration improve theoretical modeling.

Effective inclusion of resonances enhances understanding of hyperon decay mechanisms.

Abstract

We examine the importance of resonances for the non-leptonic hyperon decays in the framework of chiral perturbation theory. Lower lying resonances are included into the effective theory. Integrating out the heavy degrees of freedom in the resonance saturation scheme generates higher order counterterms in the effective Lagrangian, providing an estimate of the pertinent coupling constants. A fit to the eight independent decay amplitudes that are not related by isospin symmetry is performed and reasonable agreement for both s- and p- waves is achieved.