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Based on a sample of $(448.1\pm2.9)\times10^{6}$ $\psi(3686)$ eventscollected with the BESIII detector at BEPCII, the decays of$\psi(3686)\to{}K^{-}\Lambda\overline{\Xi}^{+} + c.c.$ with $\overline{\Xi}^+\to \overline{\Lambda} \pi^+$, $\overline{\Lambda}\to \overline{p} \pi^+$ arestudied.Two excited hyperons, $\Xi(1690)^-$ and $\Xi(1820)^-$, are observedwith large significance ($ \gg 10 \sigma$) in the $K^{-}\Lambda$ invariant massdistributions. A partial wave analysis is performed, and the spin-parities of$\Xi(1690)^-$ and $\Xi(1820)^-$ are determined to be $\frac{1}{2}^{-}$ and$\frac{3}{2}^{-}$, respectively. The masses, widths, and product branchingfractions of $\Xi(1690)^-$ and $\Xi(1820)^-$ are also measured.

Study of excited $\Xi$ states in $\psi(3686)\rightarrow{}K^{-}\Lambda\overline{\Xi}^{+}+c.c.$