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A study of the meson-baryon interaction in the $S=-1$ sector is performed,employing a chiral SU(3) lagrangian up to next-to-leading order (NLO) andimplementing unitarization in coupled channels. The model is constrained by alarge set of experimental data, paying a especial attention to processes thatare sensitive to the NLO contributions, such as the $K^- p\to K^+\Xi^-,K^0\Xi^0$ reactions. The consideration of additional cross sections in singleisospin channels, $K^-p\to \eta\Lambda, \eta\Sigma$, has been found to providemore homogeneous and reliable values of the low-energy constants, the stabilityof which has also been tested by the inclusion of explicit resonant terms.Predictions for new isospin filtering processes, like the $I=1$ $K^0_L p \toK^+ \Xi^0$ reaction that could be measured at the proposed secondary $K^0_L$beam at Jlab, or the weak decay of the $\Lambda_b$ into a $J/\Psi$ anddifferent meson-baryon pairs in $I=0$, available at LHCb, are presented. Themeasurement of such reactions would put valuable constraints on the chiralmodels describing the $S=-1$ meson-baryon interaction.

$S=-1$ meson-baryon interaction and the role of isospin filtering processes