Quarkonia in Hamiltonian Light-Front QCD

Abstract

A constituent parton picture of hadrons with logarithmic confinement naturally arises in weak coupling light-front QCD. Confinement provides a mass gap that allows the constituent picture to emerge. The effective renormalized Hamiltonian is computed to $\mathcal{O}(g^2)$, 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 $\Lambda$. The resultant hyperfine structure is very close to experiment.

Comments: 9 pages, 1 latex figure included in the text. Published version (much more reader-friendly); corrected error in self-energy