Search for the proton decay mode p -> ¯νK+ with KamLAND

Open Access
Authors
  • A. Asakura
  • A. Gando
  • Y. Gando
  • T. Hachiya
  • S. Hayashida
  • H. Ikeda
  • K. Inoue
  • K. Ishidoshiro
  • T. Ishikawa
  • S. Ishio
  • M. Koga
  • R. Matsuda
  • S. Matsuda
  • T. Mitsui
  • D. Motoki
  • K. Nakamura
  • S. Obara
  • Y. Oki
  • T. Oura
  • I. Shimizu
  • Y. Shirahata
  • J. Shirai
  • A. Suzuki
  • H. Tachibana
  • K. Tamae
  • K. Ueshima
  • H. Watanabe
  • B.D. Xu
  • Y. Yamauchi
  • H. Yoshida
  • A. Kozlov
  • Y. Takemoto
  • S. Yoshida
  • K. Fushimi
  • C. Grant
  • A. Piepke
  • T.I. Banks
  • B.E. Berger
  • S.J. Freedman
  • B.K. Fujikawa
  • T. O’Donnell
  • J.G. Learned
  • J. Maricic
  • M. Sakai
  • S. Dazeley
  • R. Svoboda
  • L.A. Winslow
  • Y. Efremenko
  • H.J. Karwowski
  • D.M. Markoff
  • W. Tornow
  • J.A. Detwiler
  • S. Enomoto
  • M.P. Decowski
Publication date 2015
Journal Physical Review D. Particles and Fields
Article number 052006
Volume | Issue number 92 | 5
Number of pages 10
Organisations
  • Faculty of Science (FNWI) - Institute of Physics (IoP) - Institute for High Energy Physics (IHEF)
Abstract 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.
Document type Article
Note KamLAND Collaboration
Language English
Published at https://doi.org/10.1103/PhysRevD.92.052006
Downloads
Search for the proton decay mode (Final published version)
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