Search for strange Tribaryon states in the 4He(stopped K -, p) reaction

M. Sato, H. Bhang, J. Chiba, Seonho Choi, Y. Fukuda, T. Hanaki, R. S. Hayano, M. Iio, T. Ishikawa, S. Ishimoto, T. Ishiwatari, K. Itahashi, M. Iwai, M. Iwasaki, P. Kienle, J. H. Kim, Y. Matsuda, H. Ohnishi, S. Okada, H. OutaS. Suzuki, T. Suzuki, D. Tomono, E. Widmann, T. Yamazaki, H. Yim

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We have measured a proton energy from the stopped K- reaction on 4He to search for strange tribaryon states at KEK 12 GeV PS. No statistically significant signal was observed in the missing mass spectrum obtained by the inclusive 4He(stopped K-, p) measurement. Upper limits of the formation branching ratio at the 95 % C.L. were derived for neutral tribaryon states with strangeness -1 to be (0.4 ∼ 6) × 10 -4, (0.2 ∼ 6) × 10-3 and (0.06 ∼ 5) × 10-2/(stopped K-) for assumed natural widths of 0, 20 and 40 MeV/c2, respectively.

Original languageEnglish
Pages (from-to)442-445
Number of pages4
JournalInternational Journal of Modern Physics A
Issue number2-3
Publication statusPublished - 2009 Jan 30
Externally publishedYes


  • Strangeness
  • Tribaryon states

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Nuclear and High Energy Physics
  • Astronomy and Astrophysics


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