Search For Proton Decay Through P -> (Nu)Over-Bark(+) In A Large Water Cherenkov Detector

PHYSICAL REVIEW LETTERS(1999)

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摘要
We present results of a search for proton decays, p --> <(nu)over bar>K+, using data from a 33 kt . yr exposure of the Super-Kamiokande detector. Two decay modes of the kaon, K+ --> mu(+)nu(mu) and K+ --> 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 --> <(nu)over bar>K+) was found to be 6.7 X 10(32) years at 90% confidence level.
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