(S3)3flavor symmetry andp→K0e+

We show how to incorporate the lepton sector in a supersymmetric theory of flavor based on the discrete flavor group ${\left(S_3\right)}^3$. Assuming that all possible nonrenormalizable operators are generated at the Planck scale, we show that the transformation properties of the leptons and of the flavor-symmetry-breaking fields are uniquely determined. We then demonstrate that the model has a viable phenomenology and makes one very striking prediction: the nucleon decays predominantly to $\mathrm{Kl}$ where $l$ is a first generation lepton. We show that the modes $n\to K^0{\overline{\nu }}_e$, $p\to K^{+}{\overline{\nu }}_e$, and $p\to K^0{e}^{+}$ occur at comparable rates, and could well be discovered simultaneously at the SuperKamiokande experiment.