J-PARC E27 Experiment to Search for a Nuclear Kaon Bound State K-pp

Y. Ichikawa, H. C. Bhang, S. Bufalino, H. Ekawa, P. Evtoukhovitch, A. Feliciello, H. Fujioka, S. Hasegawa, Shuhei Hayakawa, Ryotaro Honda, K. Hosomi, K. Imai, S. Ishimoto, C. W. Joo, S. Kanatsuki, R. Kiuchi, Takeshi Koike, H. Kumawat, Y. Matsumoto, K. MiwaM. Moritsu, T. Nagae, M. Naruki, M. Niiyama, Y. Nozawa, R. Ota, A. Sakaguchi, H. Sako, V. Samoilov, S. Sato, K. Shirotori, H. Sugimura, S. Suzuki, T. Takahashi, T. N. Takahashi, H. Tamura, T. Tanaka, K. Tanida, A. O. Tokiyasu, Z. Tsamalaidze, B. J. Roy, M. Ukai, T. O. Yamamoto, S. B. Yang

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12 Citations (Scopus)


In the J-PARC E27 experiment, we search for a K - pp bound state via the d(π +, K +) reaction at 1.7 GeV/c at the K1.8 beam line. The binding energy and decay width of the K - pp bound state can be obtained in the missing mass measurement with a good energy resolution of 2 MeV/c 2. A range counter array (RCA) was constructed to detect the two high-momentum protons from the K - pp decay and to reduce the background such as quasi-free hyperon production. Recently, we have carried out a pilot run in June, 2012. The d(π +, K +) missing-mass spectrum has been obtained for the first time. In this report, an overview of the E27 experiment and a preliminary result on this pilot run are presented.

Original languageEnglish
Pages (from-to)1191-1194
Number of pages4
JournalFew-Body Systems
Issue number7-10
Publication statusPublished - 2013 Aug

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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