Masses and Boost-Invariant Wave Functions of Heavy Quarkonia from the   Light-Front Hamiltonian of QCD
  A new scheme for calculating masses and boost-invariant wave functions of heavy quarkonia is developed in a light-front Hamiltonian formulation of QCD. Only the simplest approximate version with one flavor of quarks and an ansatz for the mass gap for gluons is discussed. The resulting spectra look reasonably good in view of the crude approximations made in the simplest version. 
Stanislaw D. Glazek