Electromagnetic Properties of Baryons in a Quark-Diquark Model with BrokenSU(6)

Abstract

An investigation of the electromagnetic properties of baryons is made with a quark-diquark model using broken $\mathrm{SU}\left(6\right)\mathrm{}$ wave functions. The magnetic moments are calculated assuming no orbital contributions and equal gyromagnetic ratios for the quarks. The resulting magnetic-moment sum rules deviate slightly from the $\mathrm{SU}\left(3\right)\mathrm{}$ and $\mathrm{SU}\left(6\right)\mathrm{}$ predictions. The electromagnetic mass splittings are assumed to be composed of intrinsic splitting in the quark and diquark, Coulomb terms, and magnetic terms. We obtain fewer sum rules than with the quark model under analogous assumptions about symmetry breaking.