Comment on theKL−KSmass difference in the left-right model

Abstract

It is pointed out, with the help of Ward identities, that the box diagrams contributing to the $K_L-K_S$ mass difference in ${\mathrm{SU}\mathrm{}\left(2\right)\mathrm{}}_L\times {\mathrm{SU}\mathrm{}\left(2\right)\mathrm{}}_R\times \mathrm{U}\mathrm{}\left(1\right)\mathrm{}$ models are not gauge independent.