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27 April 2024

» arxiv » 1203.3604

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Search for the $Theta^{+}$ pentaquark via the $pi^-p o K^-X$ reaction at 1.92 GeV/$c$
K. Shirotori ; T. N. Takahashi ; S. Adachi ; M. Agnello ; S. Ajimura ; K. Aoki ; H. C. Bang ; B. Bassalleck ; E. Botta ; S. Bufalino ; N. Chiga ; P. Evtoukhovitch ; A. Feliciello ; H. Fujioka ; F. Hiruma ; R. Honda ; K. Hosomi ; Y. Ichikawa ; M. Ieiri ; Y. Igarashi ; K. Imai ; N. Ishibashi ; S. Ishimoto ; K. Itahashi ; R. Iwasaki ; C. W. Joo ; M. J. Kim ; S. J. Kim ; R. Kiuchi ; T. Koike ; Y. Komatsu ; V. V. Kulikov ; S. Marcello ; S. Masumoto ; K. Matsuoka ; K. Miwa ; M. Moritsu ; T. Nagae ; M. Naruki ; M. Niiyama ; H. Noumi ; K. Ozawa ; N. Saito ; A. Sakaguchi ; H. Sako ; V. Samoilov ; M. Sato ; S. Sato ; Y. Sato ; S. Sawada ; M. Sekimoto ; H. Sugimura ; S. Suzuki ; 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 ;
Date:	16 Mar 2012
Abstract:	The $Theta^+$ pentaquark baryon was searched for via the $pi^-p o K^-X$ reaction in a missing-mass resolution of 1.4 MeV/$c^2$(FWHM) at J-PARC. $pi^-$ meson beams were incident on the liquid hydrogen target with the beam momentum of 1.92 GeV/$c$. No peak structure corresponding to the $Theta^+$ mass was observed. The upper limit of the production cross section averaged over the scattering angle of 2$^{circ}$ to 15$^{circ}$ in the laboratory frame was obtained to be 0.26 $mu$b/sr in the mass region of 1.51$-$1.55 GeV/$c^2$.The upper limit of the $Theta^+$ decay width using the effective Lagrangian approach was obtained to be 0.72 MeV/$c^2$ and 3.1 MeV/$c^2$ for $J^P_{Theta}=1/2^+$ and $J^P_{Theta}=1/2^-$, respectively.
Source:	arXiv, 1203.3604
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