Meson and nucleon properties from Dyson-Schwinger QCD
  We present selected results from a calculation of meson and nucleon observables in a Green-function approach. A rainbow-ladder truncation of QCD's Dyson-Schwinger equations is used to solve the respective meson, diquark and quark-diquark Bethe-Salpeter equations. It allows for a simultaneous description of meson and nucleon masses and electromagnetic properties from an effective quark-gluon interaction. The results describe a hadronic quark core which agrees with lattice data for heavy quarks whereas pion-cloud effects are missing towards the chiral limit. The neutron's Dirac form factor is negative due to the presence of axial-vector diquark correlations. 
Gernot Eichmann, Reinhard Alkofer, Andreas Krassnigg, Diana Nicmorus