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.
Original language | English |
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Pages (from-to) | 955-960 |
Number of pages | 6 |
Journal | Few-Body Systems |
Volume | 54 |
Issue number | 7-10 |
DOIs | |
State | Published - Aug 2013 |