Archivio Istituzionale della RicercaThe 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., S., T., T., S., A., Agnello, M., S., A., K., A., H., B., B., B., E., B., Bufalino, S., N., C., P., E., A., F., H., F., F., H., R., H., K., H., Y., I., M., I., Y., I., et al.. - 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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https://hdl.handle.net/11583/2506344
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