Search for strange tribaryon states in the inclusive ^4He(K^{-}_{stopped}, 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. Outa; S. Suzuki; T. Suzuki; D. Tomono; E. Widmann; T. Yamazaki; H. Yim

doi:10.1016/j.physletb.2007.11.024

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arXiv · 0708.2968

Search for strange tribaryon states in the inclusive ^4He(K^{-}_{stopped}, p) reaction

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Abstract

A search for tribaryon states was performed at KEK-PS. We adopted the $^4$He($K^-_{stopped}, p)$ reaction to populate the states with strangeness -1, charge 0 and isospin 1. No significant narrow structure was observed in the mass region from 3000 to 3200 MeV/c^2 in an inclusive missing mass spectrum. The upper limit of the formation branching ratio was determined to be ($1\sim3)\times 10^{-4}$, ($0.7\sim2)\times 10^{-3}$ and ($2\sim8) \times 10^{-3}$/($stopped K^{-}$) with 95 % confidence level for narrow states with an assumed width of 0, 20 and 40 MeV/c^2, respectively.

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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. Outa, S. Suzuki, T. Suzuki, D. Tomono, E. Widmann, T. Yamazaki, H. Yim. 2007-08-22. Search for strange tribaryon states in the inclusive ^4He(K^{-}_{stopped}, p) reaction. https://doi.org/10.1016/j.physletb.2007.11.024

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