Relativistic Meson Spectroscopy and In-Medium Effects
  We extend our earlier model of $q\bar q$ mesons using relativistic quasipotential (QP) wave equations to include open-flavor states and running quark-gluon coupling effects. Global fits to meson spectra are achieved with rms deviations from experiment of 43-50 MeV. We examine in-medium effects through their influence on the confining interaction and predict the confining strength at which the masses of certain mesons fall below the threshold of their dominant decay channel. 
Alan J. Sommerer, A. Abd El-Hady, John R. Spence, and James P. Vary