Search for the proton decay mode p -> ¯νK+ with KamLAND
- Asakura, A.
- Gando, A.
- Gando, Y.
- Hachiya, T.
- Hayashida, S.
- Ikeda, H.
- Inoue, K.
- Ishidoshiro, K.
- Ishikawa, T.
- Ishio, S.
- Koga, M.
- Matsuda, R.
- Matsuda, S.
- Mitsui, T.
- Motoki, D.
- Nakamura, K.
- Obara, S.
- Oki, Y.
- Oura, T.
- Shimizu, I.
- Shirahata, Y.
- Shirai, J.
- Suzuki, A.
- Tachibana, H.
- Tamae, K.
- Ueshima, K.
- Watanabe, H.
- Xu, B.D.
- Yamauchi, Y.
- Yoshida, H.
- Kozlov, A.
- Takemoto, Y.
- Yoshida, S.
- Fushimi, K.
- Grant, C.
- Piepke, A.
- Banks, T.I.
- Berger, B.E.
- Freedman, S.J.
- Fujikawa, B.K.
- O’Donnell, T.
- Learned, J.G.
- Maricic, J.
- Sakai, M.
- Dazeley, S.
- Svoboda, R.
- Winslow, L.A.
- Efremenko, Y.
- Karwowski, H.J.
- Markoff, D.M.
- Tornow, W.
- Detwiler, J.A.
- Enomoto, S.
- Decowski, M.P.
Publication date
January 2015
DOI Publisher
American Physical Society (APS) ISSN
1550-7998Abstract
We present a search for the proton decay mode p→ν¯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→ν¯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±0.2 events. The nonbackground-subtracted limit on the partial proton lifetime is τ/B(p→ν¯K+)>5.4×1032 years at 90% C.L
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