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arXiv · 1203.3604

Search for the $\Theta^{+}$ pentaquark via the $\pi^-p\to K^-X$ 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
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Abstract

The $\Theta^+$ pentaquark baryon was searched for via the $\pi^-p\to K^-X$ 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.

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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. 2012-03-16. Search for the $\Theta^{+}$ pentaquark via the $\pi^-p\to K^-X$ reaction at 1.92 GeV/$c$. https://doi.org/10.1103/physrevlett.109.132002

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