Two- and three-body resonances in the $\bar{K}$NN−πΣNsystem

Abstract

Abstract.One of the most important characteristics of a two-body interaction is existence and properties of its bound states or resonances. When the interaction is used in a few-or many-body calculation they also strongly influence the properties of the few-or many-body system. We investigate the dependence of the three-body resonance properties in theKNN system on the different models ofKN interaction, providing one or two poles for Λ(1405) resonance. TheKNN − πΣN system is described by coupled-channel Faddeev equations in AGS form, our two-bodyKN − πΣ interaction models reproduce all existing experimental data on K − p scattering and K − p atom level shift.