Partial-wave analysis of the pi- + proton goes to eta meson + neutron and pi- + proton goes to neutral kaon + Lambda reactions10/01/2012
We investigate the hadronic reactions πN→ηN and πN→KΛ via single-energy partial-wave analyses in the c.m. energy range 1080 to 2100 MeV. Our results for the KΛ channel are consistent with prior works; however, for the ηNchannel our results differ significantly from previous energy-dependent partial-wave analyses that violate the S-matrix unitarity. We present results of ηN and KΛ partial-wave amplitudes constrained by a unitary energy-dependent model. We obtain excellent predictions of integrated cross sections for the two reactions from a global energy-dependent solution. Our results imply that the region just above S11(1535) has a major contribution from P11(1710) for π−p→ηn, whereas the large peak near 1700 MeV in π−p→K0Λ is dominated by contributions from both S11(1650) and P11(1710).