Ke3andKμ3Decay Modes

A viewpoint is presented in which some boson pairs are included among members which are exerting universal weak interactions on each other. The inclusion of $K$-meson-pion pairs leads to direct terms responsible for $K_{e3\mathrm{}}$ and $K_{\mu 3}$ decay modes. It is shown that these direct terms may result in too rapid decays of $K_{e3\mathrm{}}$ and $K_{\mu 3}$ if one assumes the universality of the weak-coupling constant, while the branching ratio of these decay modes is quite consistent with the data.