We study the quark-mass dependence of View the MathML sources-wave and View the MathML sourced-wave baryon resonances. Parameter-free results are obtained in terms of the leading order chiral Lagrangian. In the ‘heavy’ SU(3) limit with mπ=mK≃500 MeV the s

The known resonance parameters of the Λ and Σ hyperons were determined almost entirely from energy-dependent partial-wave analyses of View the MathML source scattering data. Some of these analyses attempted to obtain a consistent set of parameters for reactions involving different final states (View the MathML source, πΛ, πΣ), but unitarity was not enforced and various features (e.g., backgrounds) were not treated consistently. Now that K−p→neutrals data are beginning to be published by the Crystal Ball Collaboration, it is timely to take a fresh look at the strangeness −1 hyperons. First results are presented for a new unitary, multichannel description of several View the MathML source reactions.