Abstract
The Θ + pentaquark baryon was searched for via the π − p → K − X reaction at J-PARC. π − meson beams were irradiated on the liquid hydrogen target with the beam momentum of 1.92 GeV/c. In the missing mass spectrum, no peak structure corresponding to Θ + mass was observed. The preliminary upper limit of the differential cross section averaged over the scattering angle of 2° to 15° at the laboratory frame was less than 0.3 μb/sr at the 90 % confidence level in the missing mass region over 1.51 to 1.55 GeV/c 2.
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Shirotori, K. Search for Θ + via the Pion Induced Reaction at J-PARC: J-PARC E19. Few-Body Syst 54, 145–150 (2013). https://doi.org/10.1007/s00601-012-0367-5
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DOI: https://doi.org/10.1007/s00601-012-0367-5