Study of the DecayΛ(1520)→Σ(1385)π

The decay $\Lambda \mathrm{}\left(1520\right)\mathrm{}\to \Sigma \mathrm{}\left(1385\right)\mathrm{}\pi$ has been studied in an energy-independent partial-wave analysis of the reaction $K^{-}p\to \Lambda {\pi }^{+}{\pi }^{-}$ in the momentum range 300 to 470 MeV/c. The width is found to be $\Gamma =1.40\mathrm{}\pm 0.26$ MeV. Combining this result with one recently reported for $\Lambda \mathrm{}\left(1690\right)\mathrm{}$, we obtain a singlet-octet mixing angle $\left|\theta \right|=73\mathrm{}°\pm 10°$, in disagreement with the value $\theta =-25\mathrm{}°\pm 6°$ derived from the two-body decays of the $J^P={\frac{3}{2}}^{-}$ states.