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

Abstract

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 $p\to \bar{\nu }{K}^{+}$, $n\to \bar{\nu }{K}^0$, $p\to {\mu }^{+}{K}^0$ and $p\to e^{+}{K}^0$ modes. We found no evidence for nucleon decay in any of these modes. We set lower limits of partial nucleon lifetime 2.3$\times 10^{33}$, 1.3$\times 10^{32}$, 1.3$\times 10^{33}$ and 1.0$\times 10^{33}$ years at 90% confidence level for $p\to \bar{\nu }{K}^{+}$, $n\to \bar{\nu }{K}^0$, $p\to {\mu }^{+}{K}^0$ and $p\to e^{+}{K}^0$ modes, respectively. These results give a strong constraint on supersymmetric grand unification models.

14 pages, 13 figures