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- W4312369226 abstract "We present a new proposal, J-PARC E90, to measure a missing-mass spectrum near the Σ N threshold for the d ( K − , π − ) reactions at 1.4 GeV/ c . While many previous experiments support apparent enhancement near the ΣN thresh-old, the dynamical origin of this so-called “Σ N cusp” remains yet unsolved. The enhancement suggests either a cusp structure or a weakly bound state. One of the keys to making it clear is improving the missing-mass resolution and statistics. Our new experiment can achieve the missing-mass resolution of 0.4 MeV in σ using the K1.8 beam line and S-2S spectrometers at J-PARC. Further-more, we can suppress quasi-free background processes with the time projection chamber (HypTPC), which operated nicely for the H-dibaryon search experi-ment (J-PARC E42). The J-PARC E90 aims to extract the scattering length of the Σ N system with isospin T = 1/2 and spin-triplet channels." @default.
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- W4312369226 date "2022-01-01" @default.
- W4312369226 modified "2023-09-27" @default.
- W4312369226 title "High resolution spectroscopy of the “Σ<i>N</i> cusp” by using the <i>d</i>(<i>K</i><sup>−</sup>, <i>π</i><sup>−</sup>) reaction" @default.
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- W4312369226 doi "https://doi.org/10.1051/epjconf/202227102012" @default.
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