QUARKONIA IN HAMILTONIAN LIGHT-FRONT QCD

A constituent parton picture of hadrons with logarithmic confinement n aturally arises in weak coupling light-front QCD. Confinement provides a mass gap that allows the constituent picture to emerge. The effecti ve renormalized Hamiltonian is computed to O(g(2)), and used to study charmonium and bottomonium. Radial and angular excitations can be used to fix the coupling alpha, the quark mass M, and the cutoff Lambda. T he resultant hyperfine structure is very close to experiment.