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

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 ($1\sim 3)\times 10^{-4}$, ($0.7\sim 2)\times 10^{-3}$ and ($2\sim 8)\times 10^{-3}$/($stopped{K}^{-}$) with 95 % confidence level for narrow states with an assumed width of 0, 20 and 40 MeV/c^2, respectively.

11 pages, 6 figures, submitted to Physics Letters B

References in corpus (3)

• Emission spectra and invariant masses of Lambda and p in the stopped-K-NN absorption process in 4He and 6Li
• Indication of a strange tribaryon S^+ from the ^4He(stopped K^-,n) reaction
• Search for a kaonic nuclear state via ${}^4$He$(K^{-},N)$

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• Search for the deeply bound $K^{-}pp$ state from the semi-inclusive forward-neutron spectrum in the in-flight $K^{-}$ reaction on helium-3
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