Theory of low-energy kaon-nucleon scattering

A phenomenological s-wave K-matrix fit is made for the low energy K-p data, including that reported at this Conference, and using, through dispersion relations, the most accurate KN and anti KN forward amplitudes and total cross sections available at higher energies. Some discussion is given of what types of data are most needed for further progress. The nature of the resonance ν (1405) is discussed briefly in the light of this fit. The physical origin of CDD poles is emphasized and they are used to suggest more general K-matrix forms for future data analyses. (orig.)