Search for Trilepton Nucleon Decay via p → e+vv and p → μ+vv in the Super-Kamiokande Experiment

The trilepton nucleon decay modes p -> e(+)nu nu and p -> mu(+)nu nu violate vertical bar Delta(B - L)vertical bar by two units. Using data from a 273.4 kt yr exposure of Super-Kamiokande a search for these decays yields a fit consistent with no signal. Accordingly, lower limits on the partial lifetimes of tau(p -> e+nu nu) > 1.7 x 10(32) years and tau(p ->mu+nu nu) > 2.2 x 10(32) years at a 90% confidence level are obtained. These limits can constrain Grand Unified Theories which allow for such processes.