Space-like electromagnetic form factors of lambda- and sigma-baryons from quark-diquark Faddeev equations

Abstract

An important goal of ongoing and future experiments is to explore spectra and transition form factors of baryons with non-zero strangeness. Of particular interest is the transition form factor γ(*) Σ0 -> Λ in the time-like momentum region that can be extracted from Dalitz decays. On the road towards a theoretical description of these form factors we extend a covariant dynamical quark-diquark model for the baryon Faddeev equation to the strange-quark sector. Based on an excellent description of the mass spectrum of selected baryon octet and decuplet states and reasonable results for the nucleon form factors we determine the elastic electromagnetic form factors of Λ and Σ+, Σ0, Σ- hyperons in the space-like region as well as the ones for the octet transition γ(*) Σ0 -> Λ. We discuss qualitative and quantitative features of the diquark-quark picture and compare systematically with previous results from a three-body Faddeev approach and lattice data where available.