PI-PI SCATTERING IN A QCD-BASED MODEL FIELD-THEORY

A model field theory, in which the interaction between quarks is media ted by dressed vector boson exchange, is used to analyze the pionic se ctor of QCD. It is shown that this model, which incorporates dynamical chiral symmetry breaking, asymptotic freedom, and quark confinement, allows one to calculate f(pi), m(pi), r(pi), and the partial wave ampl itudes in pi-pi scattering and obtain good agreement with the experime ntal data, with the latter being well described up to energies E congr uent-to 550 MeV.