Systematic study of octet-baryon electromagnetic form factors in covariant chiral perturbation theory

TL;DR

This paper systematically calculates octet-baryon electromagnetic form factors using covariant SU(3) chiral perturbation theory at O(p^3), including vector mesons and decuplet states, to match data and predict unmeasured observables.

Contribution

It provides a comprehensive covariant chiral perturbation theory analysis of octet-baryon form factors with explicit inclusion of vector mesons and decuplet states, and determines low-energy constants.

Findings

Predicted magnetic moments and radii for hyperons.

Determined low-energy constants from existing data.

Made predictions for unmeasured hyperon properties.

Abstract

We perform a complete and systematic calculation of the octet-baryon form factors within the fully covariant approach of SU(3) chiral perturbation theory at O(p^3). We use the extended on-mass shell renormalization scheme, and include explicitly the vector mesons and the spin-3/2 decuplet intermediate states. Comparing these predictions with data including magnetic moments, charges, and magnetic radii, we determine the unknown low-energy constants, and give predictions for yet unmeasured observables, such as the magnetic moment of the Sigma^0, and the charge and magnetic radii of the hyperons.