Electromagnetic form factors of octet baryons with the nonlocal chiral effective theory

TL;DR

This paper uses a nonlocal chiral effective theory to calculate the electromagnetic form factors of octet baryons, achieving good agreement with experimental and lattice data for magnetic moments and radii.

Contribution

It introduces a nonlocal interaction approach that naturally regulates loop integrals and models the $Q^2$ dependence of baryon form factors at tree level.

Findings

Magnetic moments match experimental and lattice results.

Form factors' momentum dependence studied up to 1 GeV$^2$.

Radiuses of octet baryons are accurately predicted.

Abstract

The electromagnetic form factors of octet baryons are investigated with the nonlocal chiral effective theory. The nonlocal interaction generates both the regulator which makes the loop integral convergent and the $Q^2$ dependence of form factors at tree level. Both octet and decuplet intermediate states are included in the one loop calculation. The momentum dependence of baryon form factors are studied up to 1 GeV$^2$ with the same number of parameters as for the nucleon form factors. The obtained magnetic moments of all the baryon octets as well as the radii are in good agreement with the experimental data and/or lattice simulation.