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We perform a simultaneous analysis of s- and p-waves of the $S=-1$meson-baryon scattering amplitude using all low-energy experimental data. Forthe first time, differential cross section data are included for chiral unitarycoupled-channel models. From this model s- and p-wave amplitudes are extractedand we observe both well-known $I(J^P)=0(1/2^-)$ s-wave states as well as a new$I(J^P)=1(1/2^+)$ state absent in quark models and lattice QCD results.Multiple statistical and phenomenological tests suggest that, while the dataclearly require an $I=1$ p-wave resonance, the new state just accounts for theabsence of the decuplet $\Sigma(1385)3/2^+$ in the model.

S- and p-wave structure of $S=-1$ meson-baryon scattering in the resonance region