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We present a study of the $S=-1$ meson-baryon interaction, employing a chiralSU(3) Lagrangian up to next-to-leading order (NLO) and implementingunitarization in coupled channels. The parameters of the model have been fittedto a large set of experimental scattering data in different two-body channels,to threshold branching ratios, and to the precise SIDDHARTA value of the energyshift and width of kaonic hidrogen. In contrast to other groups, we have takeninto consideration the $K^- p\to K^+\Xi^-, K^0\Xi^0$ reaction data, since wefound in a previous work to be especially sensitive to the NLO parameters ofthe chiral Lagrangian. In the present work we also include the Born terms,which usually have very little effect, and find them to be non-negligible inthe $K^- p\to K\Xi$ channels, correspondingly causing significant modificationsto the NLO parameters. We furthermore show that the importance of the Bornterms becomes more visible in the isospin projected amplitudes of the $K^-p \toK\Xi$ reactions. The measurement of processes that filter single isospincomponents, like the $K^0_L p \to K^+ \Xi^0$ reaction that could be measured atthe proposed secondary $K^0_L$ beam at Jlab, would put valuable constraints onthe chiral models describing the meson-baryon interaction in the $S=-1$ sector.

The chiral S=-1 meson-baryon interaction with new constrains on the NLO contributions