Gauge model with heavy weak bosons and small additional neutral-current interaction proportional to charge squared

Abstract

An SU(2)×U(1)×SU(2)′ model is considered with symmetrical isovector gauge couplings. Heavy fermions with $V+A$ weak interactions are assigned to SU(2)′. The symmetry is broken by scalar multiplets $(T,Y,T^{\prime })=(\frac{1}{2},1,0),(0,1,\frac{1}{2}),(\frac{1}{2},0,\frac{1}{2})$ with respective vacuum expectation values $v\ll w\sim u$. The predictions are specified by one additional weak angle. The lightest weak bosons lie in the ranges $78<~M_{W_1}<~84$ GeV and $89<~M_{Z_1}<~100$ GeV. The smallness of the additional $C{Q}^2$ neutral-current interaction is explained.