Radiative corrections toβandμdecays inSU(2)L×U(1)models involving2nflavors

The analysis of the radiative corrections to $\beta$ and $\mu$ decays is generalized to a class of $\mathrm{SU}{\mathrm{}\left(2\right)\mathrm{}}_L\times \mathrm{U}\mathrm{}\left(1\right)\mathrm{}$ models with $n$ left-handed doublets on the basis of the current-algebra formulation. With some rather mild qualifications, the corrections turn out to be the same as in the four-flavor case. They are important in studying the tenability of the generalized as well as the standard models. We also discuss the question whether the radiative corrections may distinguish between $\mathrm{SU}{\mathrm{}\left(2\right)\mathrm{}}_L\times \mathrm{U}\mathrm{}\left(1\right)\mathrm{}$ and $\mathrm{SU}{\mathrm{}\left(2\right)\mathrm{}}_L\times \mathrm{SU}{\mathrm{}\left(2\right)\mathrm{}}_R\times \mathrm{U}\mathrm{}\left(1\right)\mathrm{}$ models with the same low-energy phenomenology.