Delta and Omega electromagnetic form factors in a three-body covariant Bethe-Salpeter approach

Abstract

The electromagnetic form factors of the Delta and Omega baryons are calculated in the framework of Poincare-covariant bound-state equations. The quark-quark interaction is truncated to a single dressed-gluon exchange where for the dressings we use two different models and compare the results. The calculation predicts an oblate shape for the electric charge distribution and a prolate shape for the magnetic dipole distribution. We also identify the necessity of including pion-cloud corrections at low photon-momentum transfer.

Comments: 12 pages, 6 figures. Submitted to Phys.Rev.D