Search for Proton Decay through p --> ν̄K + in a Large Water Cherenkov Detector

  title={Search for Proton Decay through p --> $\nu$̄K + in a Large Water Cherenkov Detector},
  author={Super-Kamiokande Collaboration Y. Hayato and Matthew Earl and},
  journal={Physical Review Letters},
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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