Baryon form factors

TL;DR

This paper calculates baryon octet form factors using heavy baryon chiral perturbation theory, showing agreement with experimental data and highlighting the importance of kaon loops in neutron form factors.

Contribution

It introduces generalized Caldi-Pagels relations for charge radii that are unaffected by chiral loop effects.

Findings

Charge radius of $\Sigma^-$ matches recent measurements.

Kaon loop effects significantly influence neutron electric form factor.

Derived relations between charge radii are free of chiral loop effects.

Abstract

We calculate the form factors of the baryon octet in the framework of heavy baryon chiral perturbation theory. The calculated charge radius of the $\Sigma^-$ is in agreement with recent measurements from CERN and Fermilab. We show that kaon loop effects can play a significant role in the neutron electric form factor. Furthermore. we derive generalized Caldi-Pagels relations between various charge radii which are free of chiral loop effects.