Search for proton decay through p → ¯νK+ in a large water cherenkov detector

  • Y. Hayato
  • , M. Earl
  • , Y. Fukuda
  • , T. Hayakawa
  • , K. Inoue
  • , K. Ishihara
  • , H. Ishino
  • , Y. Itow
  • , T. Kajita
  • , J. Kameda
  • , S. Kasuga
  • , K. Kobayashi
  • , Y. Kobayashi
  • , Y. Koshio
  • , M. Miura
  • , M. Nakahata
  • , S. Nakayama
  • , Y. Obayashi
  • , A. Okada
  • , K. Okumura
  • N. Sakurai, M. Shiozawa, Y. Suzuki, H. Takeuchi, Y. Takeuchi, Y. Totsuka, S. Yamada, A. Habig, E. Kearns, M. D. Messier, K. Scholberg, J. L. Stone, L. R. Sulak, C. W. Walter, M. Goldhaber, T. Barszczak, D. Casper, W. Gajewski, W. R. Kropp, S. Mine, L. R. Price, M. Smy, H. W. Sobel, M. R. Vagins, K. S. Ganezer, W. E. Keig, R. W. Ellsworth, S. Tasaka, A. Kibayashi, J. G. Learned, S. Matsuno, V. J. Stenger, D. Takemori, T. Ishii, J. Kanzaki, T. Kobayashi, K. Nakamura, K. Nishikawa, Y. Oyama, A. Sakai, M. Sakuda, O. Sasaki, S. Echigo, M. Kohama, A. T. Suzuki, T. J. Haines, E. Blaufuss, B. K. Kim, R. Sanford, R. Svoboda, M. L. Chen, J. A. Goodman, G. W. Sullivan, J. Hill, C. K. Jung, K. Martens, C. Mauger, C. McGrew, E. Sharkey, B. Viren, C. Yanagisawa, W. Doki, M. Kirisawa, S. Inaba, K. Miyano, H. Okazawa, C. Saji, M. Takahashi, M. Takahata, K. Higuchi, Y. Nagashima, M. Takita, T. Yamaguchi, M. Yoshida, S. B. Kim, M. Eton, A. Hasegawa, T. Hasegawa, S. Hatakeyama, T. Iwamoto, M. Koga, T. Maruyama, H. Ogawa, J. Shirai, A. Suzuki, F. Tsushima, M. Koshiba, Y. Hatakeyama, M. Koike, M. Nemoto, K. Nishijima, H. Fujiyasu, T. Futagami, Y. Kanaya, K. Kaneyuki, Y. Watanabe, D. Kielczewska, J. S. George, A. L. Stachyra, L. L. Wai, R. J. Wilkes, K. K. Young

Research output: Contribution to journalArticlepeer-review

114 Scopus citations

Abstract

We present results of a search for proton decays, p → ¯νK+, using data from a 33kt?yr exposure of the Super-Kamiokande detector. Two decay modes of the kaon, K+ → µ+νµ and K+ → π+π0, were studied. The data were consistent with the background expected from atmospheric neutrinos; therefore a lower limit on the partial lifetime of the proton τ/B(p → ¯νK+) was found to be 6.7 × 1032 years at 90% confidence level.

Original languageEnglish (US)
Pages (from-to)1529-1533
Number of pages5
JournalPhysical review letters
Volume83
Issue number8
DOIs
StatePublished - 1999

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