Search for Pentaquark Θ+ in Hadronic Reaction at J-PARC

M. Naruki, S. Adachi, M. Agnello, S. Ajimura, K. Aoki, H. Bang, B. Bassalleck, E. Botta, S. Bufalino, H. Ekawa, P. Evtoukhovitch, A. Feliciello, H. Fujioka, Shuhei Hayakawa, F. Hiruma, Ryotaro Honda, K. Hosomi, Y. Ichikawa, M. Ieiri, Y. IgarashiK. Imai, N. Ishibashi, S. Ishimoto, K. Itahashi, R. Iwasaki, G. G. Joo, S. Kanatsuki, M. J. Kim, S. J. Kim, R. Kiuchi, T. Koike, Y. Komatsu, V. V. Kulikov, S. Marcello, S. Masumoto, Y. Matsumoto, K. Matsuoka, K. Miwa, M. Moritsu, T. Nagae, M. Niiyama, H. Noumi, Y. Nozawa, R. Ota, K. Ozawa, N. Saito, A. Sakaguchi, H. Sako, V. Samoilov, M. Sato, S. Sato, Y. Sato, S. Sawada, M. Sekimoto, K. Shirotori, H. Sugimura, S. Suzuki, T. N. Takahashi, H. Takahashi, T. Takahashi, H. Tamura, T. Tanaka, K. Tanida, A. O. Tokiyasu, N. Tomida, Z. Tsamalaidze, M. Ukai, K. Yagi, T. O. Yamamoto, S. B. Yang, Y. Yonemoto, C. J. Yoon, K. Yoshida

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The first experiment at the J-PARC hadron facility, the J-PARC E19 experiment, aims at searching for the Θ+ pentaquark in the hadronic reaction π- p → K- X using the missing-mass technique. Based on a superconducting magnet excited at 2.5 T, the spectrometer achieved the high mass resolution of 1.4 MeV/c2 for the Θ+ production process. The first data taking was performed in the autumn of 2010. No significant structure was observed in the missing-mass spectrum. The upper limit obtained for the differential cross section is 0.26 μb/sr in the laboratory frame at a 90 % CL.

Original languageEnglish
Pages (from-to)955-960
Number of pages6
JournalFew-Body Systems
Issue number7-10
Publication statusPublished - 2013 Aug

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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