  Starting from the standard Lagrangian for a SU(2) x U(1) gauge theory plus a
Higgs field we derive the corresponding "maximal helicity violating" (MHV)
Lagrangian. From this MHV Lagrangian one deduces simple diagrammatic rules for
the calculation of multi-particle scattering amplitudes. We arrive at the MHV
Lagrangian by a canonical change of the field variables in the light-cone
gauge. We comment on the modifications which occur in a spontaneously broken
gauge theory as compared to a pure (unbroken) Yang-Mills theory.
