Abstract
The first experiment at the J-PARC hadron facility, the J-PARC E19 experiment, aims at searching for the Θ + pentaquark in the hadronic reaction π − p → K − X using the missing-mass technique. Based on a superconducting magnet excited at 2.5 T, the spectrometer achieved the high mass resolution of 1.4 MeV/c2 for the Θ + production process. The first data taking was performed in the autumn of 2010. No significant structure was observed in the missing-mass spectrum. The upper limit obtained for the differential cross section is 0.26 μb/sr in the laboratory frame at a 90 % CL.
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Naruki, M., Adachi, S., Agnello, M. et al. Search for Pentaquark Θ + in Hadronic Reaction at J-PARC. Few-Body Syst 54, 955–960 (2013). https://doi.org/10.1007/s00601-013-0685-2
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DOI: https://doi.org/10.1007/s00601-013-0685-2