SU3 Gauge Theories of Weak and Electromagnetic Interactions and Strong Interaction Symmetry Breaking.

Two models of unified weak electromagnetic interactions based on the groups SU(3) and SU(3)XU(1) are proposed and discussed. In the first theory, the consequences of assigning the electron, the muon and the Perl lepton to an SU(3) octet are explored. The hadron sector of the theory and neutral current reactions are also described as well as the modifications of the theory needed to make it compatible with neutral current experimental data. In the second model, based on SU(3)XU(1), charged gauge bosons are allowed to mix and the resulting phenomenological consequences are described. A current algebra treatment of the low-lying spin zero meson mass spectrum is given on the basis of a Lagrangian which includes not only the quark mass symmetry breaking terms but also the simplest effective term which breaks the U(4)xU(4) down to SU(4)xSU(4) x quark number.