Beyond Rainbow-Ladder in a covariant three-body Bethe-Salpeter approach:   Baryons
  We report on recent results of a calculation of the nucleon and delta masses in a covariant bound-state approach, where to the simple rainbow-ladder gluon-exchange interaction kernel we add a pion-exchange contribution to account for pion cloud effects. We observe good agreement with lattice data at large pion masses. At the physical point our masses are too large by about five percent, signaling the need for more structure in the gluon part of the interaction. 
H\`elios Sanchis-Alepuz, Stanislav D. Kubrak, Christian S. Fischer
hep-ph nucl-th