Rare Kaon DecayK+→π+l+l−

A new treatment is proposed for the rare kaon decays $K^{+}\to {\pi }^{+}{e}^{+}{e}^{-}$ and $K^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$. Although the individual rates seem impossible to predict accurately at present because of large cancellations of different amplitudes, it is pointed out that a measurement of certain ratios involving these decays could provide interesting information on the weak nonleptonic interaction.