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Search for dinucleon decay into kaons in Super-Kamiokande.

Authors
  • Litos, M
  • Abe, K
  • Hayato, Y
  • Iida, T
  • Ikeda, M
  • Iyogi, K
  • Kameda, J
  • Kobayashi, K
  • Koshio, Y
  • Kozuma, Y
  • Miura, M
  • Moriyama, S
  • Nakahata, M
  • Nakayama, S
  • Obayashi, Y
  • Ogawa, H
  • Sekiya, H
  • Shiozawa, M
  • Suzuki, Y
  • Takeda, A
  • And 101 more
Type
Published Article
Journal
Physical Review Letters
Publisher
American Physical Society
Publication Date
Apr 04, 2014
Volume
112
Issue
13
Pages
131803–131803
Identifiers
PMID: 24745406
Source
Medline
License
Unknown

Abstract

A search for the dinucleon decay pp → K+ K+ has been performed using 91.6  kton·yr data from Super-Kamiokande-I. This decay provides a sensitive probe of the R-parity-violating parameter λ112''. A boosted decision tree analysis found no signal candidates in the data. The expected background was 0.28±0.19 atmospheric neutrino induced events and the estimated signal detection efficiency was 12.6%±3.2%. A lower limit of 1.7×10(32)  years has been placed on the partial lifetime of the decay O16 → C14K+ K+ at 90% C.L. A corresponding upper limit of 7.8×10(-9) has been placed on the parameter λ112''.

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