Confinement, Spin, and QCD

Abstract

The experimental and theoretical evidence relating spin dependence and long range confinement is reviewed. One of the simplest confinement ideas, the dynamic electric flux tube picture of Buchmüller, can be exploited to yield a complete effective Hamiltonian. In addition to pure Thomas spin-orbit splitting the other relativistic corrections are calculated. It is shown that our effective Hamiltonian is identical to the mechanical relativistic flux tube model and gives relativistic corrections in agreement with QCD predictions.

Comments: 10 pages, Latex, uses sprocl.sty (available from the LANL archives). 2 postscript figures, embedded using epsf.sty. Adapted from talks given at the Quarkonium Physics Workshop, Univ. of Illinois at Chicago, June 13-15, 1996, and at the International Conference on Quark Confinement and the Hadron Spectrum, Como, Italy, 1996. Z-compressed postscript version available at http://phenom.physics.wisc.edu/pub/preprints/1996/madph-96-964 or at ftp://phenom.physics.wisc.edu/pub/preprints/1996/madph-96-964