Search for proton decay through p->\barν K^+ in a large water Cherenkov detector

Details Search for proton decay through p->\barν K^+ in a large water Cherenkov detector Search for proton decay through p->\barν K^+ in a large water Cherenkov detector

1999-04-21

arxiv.org/abs/hep-ex/9904020v1

Phys.Rev.Lett.83:1529-1533,1999

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 5 eps figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.83.1529

We present results of a search for proton decays, $p \to \bar{\nu} K^+$, using data from a 33 kton$\cdot$year exposure of the Super-Kamiokande detector. Two decay modes of the kaon, $K^+ \to \mu^+ \nu_{\mu}$ and $K^+ \to \pi^+ \pi^0$, were studied. The data were consistent with the background expected from atmospheric neutrinos; therefore a lower limit on the partial lifetime of the proton $\tau / B(p \to \bar{\nu} K^+)$ was found to be $6.7 \times 10^{32}$ years at 90% confidence level.

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