Eur. Phys. J. A (2007) 33: 265-268
https://doi.org/10.1140/epja/i2007-10465-7

HYP 2006

First observation of the ΣN decay of the S = - 2 system

¹ Physics Department, Gifu University, Japan
² Department of Physics, Kyoto University, Japan
³ Faculty of Human Development, Kobe University, Japan
⁴ Department of Physics, Toho University, Japan
⁵ Wonkwang University, Korea
⁶ Department of Physics, Korea University, Korea
⁷ Department of Physics and Astronomy, University of New Mexico, Albuquerque, NM, USA
⁸ Department of Physics and Astronomy, University College London, UK
⁹ Institute of Particle and Nuclear Studies, KEK, Japan
¹⁰ Department of Physics, Nagoya University, Japan
¹¹ Chonnam National University, Korea
¹² Department of Physics, Gyeongsang National University, Korea
¹³ Institute for Advanced Physics, Konkuk University, Korea
¹⁴ Department of Physics, Carnegie Mellon University, Pittsburgh, PA, USA
¹⁵ Higashi Nippon International University, Japan
¹⁶ Osaka Prefectural Education Center, Japan
¹⁷ Brookhaven National Laboratory, Upton, NY, USA
¹⁸ Department of Physics, Tohoku University, Japan
¹⁹ Faculty of Science, Kyoto Sangyo University, Japan
²⁰ Aichi University of Education, Japan
²¹ Department of Physics, University of Tokyo, Japan
²² National Institute of Radiological Science, Chiba-city, Japan
²³ Department of Physics, Osaka City University, Japan

^* e-mail: takaomi@phys.ed.gifu-u.ac.jp

Received: 28 February 2007
Accepted: 7 July 2007
Published online: 31 August 2007

Abstract

An event emitting a Σ^- -hyperon from a Ξ^- -hyperon nuclear capture at rest has been observed in a hybrid-emulsion experiment. The event has been analyzed as the first observation of the weak decay of the S = - 2 system.