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Analysis of the Crystal Ball data on K^-ptoπ⁰Sigma⁰ reaction with center-of-mass energies of 1536sim 1676 MeV
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Analysis of the Crystal Ball data on K^-ptoπ⁰Sigma⁰ reaction with center-of-mass energies of 1536sim 1676 MeV
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With an effective Lagrangian approach, we analyze the $K^-p\to \pi^0\Sigma^0$ reaction to study the $\Lambda$ hyperon resonances by fitting the Crystal Ball data on differential cross sections and $\Sigma^0$ polarization with the center-of-mass energies of $1536\sim 1676$ MeV. Besides well established PDG 4-star $\Lambda$ resonances around this energy range, the $\Lambda(1600){1\over 2}^+$ resonance, listed as a 3-star resonance in PDG, is found to be definitely needed. In addition, there is strong evidence for the existence of a new $\Lambda({3\over 2}^+)$ resonance around 1680 MeV.
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