Search for nucleon decay via modes favored by supersymmetric grand unification models in Super-Kamiokande-I

We report the results for nucleon decay searches via modes favored by supersymmetric grand unified models in Super-Kamiokande. Using 1489 days of full Super-Kamiokande-I data, we searched for p→νK⁺, n→νK⁰, p→μ⁺K⁰, and p→e⁺K⁰ modes. We found no evidence for nucleon decay in any of these modes. We set lower limits of partial nucleon lifetime 2.3×10³³, 1.3×10³², 1.3×10³³, and 1.0×10³³ years at 90% confidence level for p→νK⁺, n→νK⁰, p→μ⁺K⁰, and p→e⁺K⁰ modes, respectively. These results give a strong constraint on supersymmetric grand unification models.