Search for the proton decay mode p → [bar over v]K[superscript +] with KamLAND
Author(s)
Asakura, K.; 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.; Efremenko, Y.; Karwowski, H. J.; Markoff, D. M.; Tornow, W.; Detwiler, J. A.; Enomoto, S.; Decowski, M. P.; Winslow, Lindley; ... Show more Show less
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We present a search for the proton decay mode p → [bar over ν]K[superscript +] based on an exposure of 8.97 kton-years in the KamLAND experiment. The liquid scintillator detector is sensitive to successive signals from p → [bar over ν]K[superscript +] 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 → [bar over ν]K[superscript +]) > 5.4 × 10[superscript 32] years at 90% C.L.
Date issued
2015-09Department
Massachusetts Institute of Technology. Department of PhysicsJournal
Physical Review D
Publisher
American Physical Society
Citation
Asakura, K., et al. "Search for the proton decay mode p → [bar over v]K[superscript +] with KamLAND." Phys. Rev. D 92, 052006 (September 2015). © 2015 American Physical Society
Version: Final published version
ISSN
1550-7998
1550-2368