The (K)over-bar N → K Ξ reaction in coupled-channels chiral models up to next-to-leading order

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 (K) over bar N -> 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.