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We report the first observation of the doubly-strange baryon $\Xi(1620)^0$ inits decay to $\Xi^-\pi^+$ via $\Xi_c^+ \rightarrow \Xi^- \pi^+ \pi^+$ decaysbased on a $980\,{\rm fb}^{-1}$ data sample collected with the Belle detectorat the KEKB asymmetric-energy $e^+ e^-$ collider. The mass and width aremeasured to be 1610.4 $\pm$ 6.0 (stat) $^{+5.9}_{-3.5}$ (syst)~MeV$/c^2$ and59.9 $\pm$ 4.8 (stat) $^{+2.8}_{-3.0}$ (syst)~MeV, respectively. We obtain4.0$\sigma$ evidence of the $\Xi(1690)^0$ with the same data sample. Theseresults shed light on the structure of hyperon resonances with strangeness$S=-2$.

Observation of $\Xi(1620)^0$ and evidence for $\Xi(1690)^0$ in $\Xi_c^+ \rightarrow \Xi^-\pi^+\pi^+$ decays