Hyperon Axial Charges in Two-Flavor Chiral Perturbation Theory

TL;DR

This paper employs two-flavor heavy baryon chiral perturbation theory to derive hyperon axial charges at next-to-leading order, comparing theoretical predictions with phenomenological and lattice QCD data to evaluate convergence.

Contribution

It provides the first derivation of hyperon axial charges at NLO in two-flavor chiral perturbation theory and assesses the theory's convergence using empirical inputs.

Findings

Convergence is best for cascade hyperons.

Derived explicit expressions for hyperon axial charges.

Comparison with lattice QCD supports the theoretical approach.

Abstract

We use two-flavor heavy baryon chiral perturbation theory to investigate the isovector axial charges of the spin one-half hyperons. Expressions for these hyperon axial charges are derived at next-to-leading order in the chiral expansion. We utilize phenomenological and lattice QCD inputs to assess the convergence of the two-flavor theory, which appears to be best for cascades.