Search for the proton decay mode $p\to \overline{\nu }{K}^{+}$ with KamLAND

Abstract

We present a search for the proton decay mode $p\to \overline{\nu }{K}^{+}$ based on an exposure of 8.97 kton-years in the KamLAND experiment. The liquid scintillator detector is sensitive to successive signals from $p\to \overline{\nu }{K}^{+}$ with unique kinematics, which allow us to achieve a detection efficiency of 44%, higher than previous searches in water Cherenkov detectors. We find no evidence of proton decays for this mode. The expected background, which is dominated by atmospheric neutrinos, is $0.9\pm 0.2$ events. The nonbackground-subtracted limit on the partial proton lifetime is $\tau /B(p\to \overline{\nu }{K}^{+})>5.4\times 10^{32}$ years at 90% C.L.

9 pages, 9 figures

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• Limit on Neutrinoless ββ Decay of Xe-136 from the First Phase of KamLAND-Zen and Comparison with the Positive Claim in Ge-76
• Improvement of low energy atmospheric neutrino flux calculation using the JAM nuclear interaction model
• Search for Proton Decay via $p\to \nu K^{+}$ using 260 kiloton$\cdot$year data of Super-Kamiokande
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