The $\bar{K}N\to K\Xi$ reaction in coupled channel chiral models up to next-to-leading order

Abstract

The meson-baryon interaction in s-wave in the strangeness S=-1 sector has been studied, employing a chiral SU(3) Lagrangian up to next-to-leading order (NLO) and implementing unitarization in coupled channels. The parameters of the Lagrangian have been fitted to a large set of experimental data in different two-body channels, paying special attention to the $\bar{K}N\to K\Xi$ reaction, which is particularly sensitive to the NLO terms. With the aim of improving the model in the $K\Xi$ production channels, effects of the high spin hyperon resonances $\Sigma (2030)$ and $\Sigma (2250)$ have been taken into account phenomenologically.