A partial wave analysis of the reaction K−n → π−Λ in the C.M. energy region from 1900 MeV to 2100 MeV

Results are presented for a partial wave analysis of the reaction K−n → π−Λ covering a range of c.m. energies from 1900 to 2100 MeV. The events used were obtained from interactions of the type K−n → π−Λps. The analysis was performed both for a sample of events where ps, the spectator proton from the deuteron, was seen, and for all events. Good agreement was found between the two sets of results. Values of the resonance parameters of the Σ(2030) were determined, and some evidence was found supporting the existence of the F5 Σ(1915). In addition, the P3 amplitude was found to be rapidly changing near 2100 MeV, consistent with a resonance in this wave at 2080 MeV.