Measurement ofK−p→ηΛnear threshold

We present measurements of the differential and total cross sections and the $\Lambda$ polarization for the reaction $K^{-}\overrightarrow{p}\eta \Lambda$ from threshold to $p_{K^{-}}=770\mathrm{}\mathrm{MeV}/c,$ with much better precision than previous measurements. Our cross-section data show a remarkable similarity to the $\mathrm{SU}\mathrm{}\left(3\right)\mathrm{}$ flavor-related ${\pi }^{-}\overrightarrow{p}\eta n$ cross-section results. The reaction $K^{-}\overrightarrow{p}\eta \Lambda$ at threshold is dominated by formation of the intermediate $\Lambda \mathrm{}\left(1670\right)\mathrm{}{\frac{1}{2}}^{-}$ state.