학술논문
Search for the $\Theta^{+}$ pentaquark via the $\pi^-p\to K^-X$ reaction at 1.92 GeV/$c$
Document Type
Working Paper
Author
Shirotori, K.; Takahashi, T. N.; Adachi, S.; Agnello, M.; Ajimura, S.; Aoki, K.; Bang, H. C.; Bassalleck, B.; Botta, E.; Bufalino, S.; Chiga, N.; Evtoukhovitch, P.; Feliciello, A.; Fujioka, H.; Hiruma, F.; Honda, R.; Hosomi, K.; Ichikawa, Y.; Ieiri, M.; Igarashi, Y.; Imai, K.; Ishibashi, N.; Ishimoto, S.; Itahashi, K.; Iwasaki, R.; Joo, C. W.; Kim, M. J.; Kim, S. J.; Kiuchi, R.; Koike, T.; Komatsu, Y.; Kulikov, V. V.; Marcello, S.; Masumoto, S.; Matsuoka, K.; Miwa, K.; Moritsu, M.; Nagae, T.; Naruki, M.; Niiyama, M.; Noumi, H.; Ozawa, K.; Saito, N.; Sakaguchi, A.; Sako, H.; Samoilov, V.; Sato, M.; Sato, S.; Sato, Y.; Sawada, S.; Sekimoto, M.; Sugimura, H.; Suzuki, S.; Takahashi, H.; Takahashi, T.; Tamura, H.; Tanaka, T.; Tanida, K.; Tokiyasu, A. O.; Tomida, N.; Tsamalaidze, Z.; Ukai, M.; Yagi, K.; Yamamoto, T. O.; Yang, S. B.; Yonemoto, Y.; Yoon, C. J.; Yoshida, K.
Source
Subject
Language
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.
Comment: 5 pages, 3 figures, 1 table
Comment: 5 pages, 3 figures, 1 table