Analysis of the new Crystal Ball data on K−p→π0Λ reaction with beam momenta of 514–750 MeV/c

The Crystal Ball Collaboration has recently reported the differential cross sections and Λ polarization for the reaction K−p→π0Λ using an incident K− beam with momenta between 514 and 750 MeV/c. We make an analysis for this process with an effective Lagrangian approach and study the properties of some Σ resonances around this energy range. With the inclusion of the 4-star resonances Σ(1189), Σ⁎(1385), , , as well as a , which is compatible with the 3-star in PDG, our results can well reproduce the experimental data. The parameters on the Σ resonances and related couplings are studied.