Insights into the quark-gluon vertex from lattice QCD and meson   spectroscopy
  By comparing successful quark-gluon vertex interaction models with the corresponding interaction extracted from lattice-QCD data on the quark's propagator, we identify common qualitative features which could be important to tune future interaction models beyond the rainbow ladder approximation. Clearly, a quantitative comparison is conceptually not simple, but qualitatively the results suggest that a realistic interaction should be relatively broad with a strong support at about $0.4-0.6$~GeV and infrared-finite. 
E. Rojas, B. El-Bennich, J.P.B.C. De Melo, M.Ali Paracha
hep-ph