Regge behaviour within the Bethe-Salpeter approach
  We present a calculation of the spectrum of light and heavy quark bound states in the rainbow-ladder truncation of Dyson-Schwinger/Bethe-Salpeter equations. By extending the formalism include the case of total angular momentum J=3, we are able to explore Regge trajectories and make prediction of tensor bound states for light and heavy quarkonia. 
Stanislav Kubrak, Christian S Fischer and Richard Williams
hep-ph