Parameters of Low-EnergyΛ−K0Production

Abstract

A pole-resonance model is used to fit the data for ${\pi }^{-}p\to \Lambda K^0$ from threshold to 1200 MeV. Parameters of the three pole contributions are taken from a study of the 1370-2200-MeV region, with form factors employed. The reduced widths of eight resonances are then determined by minimizing ${\chi }^2$. The most significant contributions to the process are found to be those of the $P_{11}\mathrm{}\left(1470\right)\mathrm{}$ and $S_{11}\mathrm{}\left(1710\right)\mathrm{}$, although other resonances are also important. The results are discussed with consideration given to $\mathrm{SU}\left(3\right)\mathrm{}$ assignments and parity doubling.