Baryons in and beyond the quark-diquark model

Abstract

We examine the nucleon's electromagnetic form factors in a Poincare-covariant Faddeev framework. The three-quark core contributions to the form factors are obtained by employing a quark-diquark approximation. We implement the self-consistent solution for the quark-photon vertex from its inhomogeneous Bethe-Salpeter equation. We find that the resulting transverse parts which add to the Ball-Chiu vertex have no significant impact on nucleon magnetic moments. The current-quark mass evolution of the form factors agrees with results from lattice QCD.

Comments: 4 pages, 1 figure, 1 table. Talk given at the MENU 2010 conference, Williamsburg, VA, USA, May 31-June 4, 2010