Hyperon elastic electromagnetic form factors in the space-like momentum region

TL;DR

This paper calculates the electromagnetic form factors of octet and decuplet baryons, including strange quarks, using Dyson-Schwinger and Bethe-Salpeter equations, providing results consistent with lattice data and predictions at high momentum transfer.

Contribution

It introduces a non-perturbative approach combining Dyson-Schwinger and Bethe-Salpeter equations to compute baryon form factors including strange quarks, with good agreement to lattice data.

Findings

Form factors agree with lattice data at finite Q^2

Deviations in magnetic moments due to missing meson cloud effects

Predictive power at larger Q^2 for both octet and decuplet baryons

Abstract

We present a calculation of the electric and magnetic form factors of ground-state octet and decuplet baryons including strange quarks. We work with a combination of Dyson-Schwinger equations for the quark propagator and covariant Bethe-Salpeter equations describing baryons as bound states of three (non-perturbative) quarks. Our form factors for the octet baryons are in good agreement with corresponding lattice data at finite $Q^2$; deviations in some isospin channels for the magnetic moments can be explained by missing meson cloud effects. At larger $Q^2$ our quark core calculation has predictive power for both, the octet and decuplet baryons.