Form Factors of Baryons in a Confining and Covariant Diquark-Quark Model

Abstract

We treat baryons as bound states of scalar or axialvector diquarks and a constituent quark which interact through quark exchange. This description results as an approximation to the relativistic Faddeev equation for three quarks which yields an effective Bethe-Salpeter equation. Octet and decuplet masses and fully four-dimensional wave functions have been computed for two cases: assuming an essentially pointlike diquark on the one hand, and a diquark with internal structure on the other hand. Whereas the differences in the mass spectrum are fairly small, the nucleon electromagnetic form factors are greatly improved assuming a diquark with structure. First calculations to the pion-nucleon form factor also suggest improvements.

11 pages, uses 'aipproc.sty'. Talk given by M.O. at the Workshop "Effective Theories of Low Energy QCD", Coimbra, Portugal, Sep 10-15 1999