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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...
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