Partial-wave analysis of π-p {\to} ηn and π-p {\to} K0Λ reactions

Abstract

We investigate the hadronic reactions πN {\to} ηN and πN {\to} 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 ηN channel our results differ significantly from previous energy-dependent partial-wave analyses that violate the S-matrix unitarity. We present the first (new) 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 {\to} ηn, whereas the large peak near 1700 MeV in π-p {\to} K0Λ is dominated by contributions from both S11 (1650) and P11 (1710).

20 pages, 5 figures