Observation of a 4ΣHe bound state in the 4He(k, π) reaction at 600MeV/c

T. Nagae, T. Miyachi, T. Fukuda, H. Outa, T. Tamagawa, J. Nakano, R. S. Hayano, H. Tamura, Y. Shimizu, K. Kubota, R. E. Chrien, R. Sutter, A. Rusek, W. J. Briscoe, R. Sawafta, E. V. Hungerford, A. Empl, W. Naing, C. Neerman, K. JohnstonM. Planinic

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135 Citations (Scopus)


We have observed a clear peak below the Σ+ -production threshold in the 4He(k, π) reaction at 600MeV/c and θ = 4°. This is confirmation of the existence of the bound state of 4ΣHe, which was reported in the 4He(stopped k, π) reaction. As in the case of stopped kaons, no such peak was found in the 4He(k, π) spectrum. Quantitatively reliable parameters for this level have been established. The binding energy and the width of the bound state are 4.4±0.3(stat)±1(syst) MeV and 7.0±0.7(stat)−0.0+1.2(syst) MeV, respectively.

Original languageEnglish
Pages (from-to)1605-1609
Number of pages5
JournalPhysical review letters
Issue number8
Publication statusPublished - 1998 Feb 23

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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