Spectroscopy of doubly heavy baryons
  Spectra of masses are calculated for the families of doubly heavy baryons in the framework of nonrelativistic quark model with the QCD potential by Buchmuller--Tye. We suppose the quark-diquark structure for the wave functions and take into account the spin-dependent splittings. The physical reasons causing the existence of quazi-stable excited states in the subsystem of heavy diquark are considered for the heavy quarks of identical flavors. 
S.S.Gershtein, V.V.Kiselev, A.K.Likhoded, A.I.Onishchenko