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Indication of a strange tribaryon S^+ from the ^4He(stopped K^-,n) reaction

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arxiv nucl-ex/0310018 v2 pith:A5XGQSXS submitted 2003-10-17 nucl-ex

M. Iwasaki , T. Suzuki , H. Bhang , G. Franklin , K. Gomikawa , R.S. Hayano , T. Hayashi , K. Ishikawa
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S. Ishimoto K. Itahashi T. Katayama Y. Kondo Y. Matsuda T. Nakamura S. Okada H. Outa B.Quinn M. Sato M. Shindo H. So T. Sugimoto P. Strasser K. Suzuki S. Suzuki D. Tomono A.M. Vinodkumar E. Widmann T. Yamazaki T. Yoneyama
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We measured the neutron time-of-flight spectrum in the ^4He(stopped K^-, n) reaction by stopping negative kaons in a superfluid helium target. A clear enhancement was observed in the neutron spectrum, which indicates the formation of a strange tribaryon of charge +1 with a mass and width of M = 3141 +/- 3 (stat.) +4/-1 (sys.) MeV/c^2 and G < 23 MeV/c^2. This state, denoted as S^+(3140), is about 25 MeV/c^2 higher than the previously observed S^0(3115) T=1.

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