(B+L)-conserving nucleon decays in supersymmetric models

The presence of the (B+L)-conserving decay modes n→${\mathit{K}}^{+}$ ${\mathit{e}}^{\mathrm{-}}$, n→${\mathit{K}}^{+}$ ${\mathrm{\mu }}^{\mathrm{-}}$, p→${\mathit{K}}^{+}$ ${\mathit{e}}^{\mathrm{-}}$ ${\mathrm{\pi }}^{+}$, and p→${\mathit{K}}^{+}$ ${\mathrm{\mu }}^{\mathrm{-}}$ ${\mathrm{\pi }}^{+}$ is shown to be a characteristic feature of a class of models with explicit breaking of R parity. These modes dominate over the (B-L)-conserving ones in certain regions of parameter space; the impact of this scenario for nucleon decay search at the Super-Kamiokande is discussed.