Octet baryon electromagnetic form factors in a relativistic quark model

TL;DR

This paper models octet baryon electromagnetic form factors using a covariant quark approach, integrating lattice QCD data and phenomenological pion cloud effects to improve understanding of baryon structure.

Contribution

It introduces a covariant parametrization combining lattice QCD and pion cloud effects within a unified framework for baryon electromagnetic properties.

Findings

Valence quark contributions extrapolated from lattice QCD data.

Pion cloud effects parameterized phenomenologically with SU(3) symmetry.

Impact of pion cloud on baryon form factors and radii analyzed.

Abstract

We study the octet baryon electromagnetic properties by applying the covariant spectator quark model, and provide covariant parametrization that can be used to study baryon electromagnetic reactions. While we use the lattice QCD data in the large pion mass regime (small pion cloud effects) to determine the parameters of the model in the valence quark sector, we use the nucleon physical and octet baryon magnetic moment data to parameterize the pion cloud contributions. The valence quark contributions for the octet baryon electromagnetic form factors are estimated by extrapolating the lattice parametrization in the large pion mass regime to the physical regime. As for the pion cloud contributions, we parameterize them in a covariant, phenomenological manner, combined with SU(3) symmetry. We also discuss the impact of the pion cloud effects on the octet baryon electromagnetic form factors and their radii.