The Theta(+) pentaquark baryon was searched for via the pi(-) p -> K- X reaction with a missing mass resolution of 1.4 MeV/c(2) (FWHM) at the Japan Proton Accelerator Research Complex (J-PARC). pi(-) meson beams were incident on the liquid hydrogen target with a 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 degrees to 15 degrees in the laboratory frame is 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 is obtained to be 0.72 and 3.1 MeV for J(Theta)(P) = 1/2(+) and J(Theta)(P) = 1/2(-), respectively, using the effective Lagrangian approach.

Search for the Θ^{+} Pentaquark via the π^{-}p→K^{-}X Reaction at 1.92  GeV/c / K., Shirotori; T., Takahashi; S., Adachi; Agnello, Michelangelo; S., Ajimura; K., Aoki; H., Bhang; B., Bassalleck; E., Botta; Bufalino, Stefania; 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., Joo; M., Kim; S., Kim; R., Kiuchi; T., Koike; Y., Komatsu; 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., Tokiyasu; N., Tomida; Z., Tsamalaidze; M., Ukai; K., Yagi; T., Yamamoto; S., Yang; Y., Yonemoto; C., Yoon; K., Yoshida. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 109:13(2012), pp. 132002-1-132002-5. [10.1103/PhysRevLett.109.132002]

Search for the Θ^{+} Pentaquark via the π^{-}p→K^{-}X Reaction at 1.92  GeV/c

AGNELLO, MICHELANGELO;BUFALINO, STEFANIA;
2012

Abstract

The Theta(+) pentaquark baryon was searched for via the pi(-) p -> K- X reaction with a missing mass resolution of 1.4 MeV/c(2) (FWHM) at the Japan Proton Accelerator Research Complex (J-PARC). pi(-) meson beams were incident on the liquid hydrogen target with a 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 degrees to 15 degrees in the laboratory frame is 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 is obtained to be 0.72 and 3.1 MeV for J(Theta)(P) = 1/2(+) and J(Theta)(P) = 1/2(-), respectively, using the effective Lagrangian approach.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2506344
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