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This work contains a study of the meson-baryon interaction in the S = −1 sector by means of a chiral S U(3) Lagrangian up to next-to-leading order (NLO) and implementing unitarization in coupled channels. In order to get more reliable values of the parameters which are present in the model, we performed several fits which take a large set of experimental scattering data in different two-body channels, threshold branching ratios, and the precise SIDDHARTA values of the energy shift and width ofdoi:10.1051/epjconf/201713705003 fatcat:cscsslpaxja4xdupapfl5a4vwm