Faddeev equation for heavy baryons in the quark-diquark picture
  We describe heavy baryons as bound states of a quark and a diquark. For this purpose we derive the Faddeev equation for baryons containing a single heavy quark from a Nambu-Jona-Lasinio type of model which is appropriately extended to include also heavy quarks. The latter are treated in the heavy mass limit. The heavy baryon Faddeev equation is then solved using a static approximation for the exchanged quark. 
D. Ebert, T. Feldmann (HU Berlin), C. Kettner, H. Reinhardt (U.   Tuebingen)