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

M. Iwasaki; T. Suzuki; H. Bhang; G. Franklin; K. Gomikawa; R. S. Hayano; T. Hayashi; K. Ishikawa; 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

arXiv · nucl-ex/0310018

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

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Abstract

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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M. Iwasaki, T. Suzuki, H. Bhang, G. Franklin, K. Gomikawa, R. S. Hayano, T. Hayashi, K. Ishikawa, 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. 2004-11-16. Indication of a strange tribaryon S^+ from the ^4He(stopped K^-,n) reaction. https://arxiv.org/abs/nucl-ex/0310018

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