Abstract
A new model of the weak interaction is presented. The renormalizable model, which is based on an SU(3) \ifmmode\times\else\texttimes\fi{} SU(3) intermediate scalar boson coupling scheme, reproduces the successes of the standard ($V\ensuremath{-}A$) theory for leptonic and semileptonic processes. Hadronic $\ensuremath{\Delta}Y=1$ processes arise in the model exclusively from finite one-loop diagrams and obey an exact octet rule. The analogous $\ensuremath{\Delta}Y=0$ graphs renormalize the quark masses to give finite mass differences within isotopic spin multiplets; when added to the electromagnetic mass differences within multiplets, this effect gives a good account of these mass splittings.
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