Evidence for the decay ${\mathrm{\Omega }}_c^0\to {\pi }^{+}\mathrm{\Omega }(2012{)}^{-}\to {\pi }^{+}(\bar{K}\mathrm{\Xi }{)}^{-}$

Using a data sample of 980~fb${}^{-1}$ collected with the Belle detector operating at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we present evidence for the $\mathrm{\Omega }(2012{)}^{-}$ in the resonant substructure of $\Omega_{c}^{0} \to \pi^+ (\bar{K}\Xi)^{-}$($(\bar{K}\Xi)^{-}$=$K^-\Xi^0$+$\bar{K}^0 \Xi^-$) decays. The significance of the $\mathrm{\Omega }(2012{)}^{-}$ signal is 4.2$\sigma$ after considering the systematic uncertainties. The ratio of the branching fraction of ${\mathrm{\Omega }}_c^0\to {\pi }^{+}\mathrm{\Omega }(2012{)}^{-}\to {\pi }^{+}(\bar{K}\mathrm{\Xi }{)}^{-}$ relative to that of ${\mathrm{\Omega }}_c^0\to {\pi }^{+}{\mathrm{\Omega }}^{-}$ is calculated to be 0.220 $\pm$ 0.059(stat.) $\pm$ 0.035(syst.). The individual ratios of the branching fractions of the two isospin modes are also determined, and found to be ${\cal B}(\Omega_{c}^0 \to \pi^+ \Omega(2012)^-) \times {\cal B}(\Omega(2012)^- \to K^-\Xi^0)/{\cal B}(\Omega_{c}^0 \to \pi^+ K^- \Xi^0)$ = (9.6 $\pm$ 3.2(stat.) $\pm$ 1.8(syst.))% and ${\cal B}(\Omega_{c}^0 \to \pi^+ \Omega(2012)^-) \times {\cal B}(\Omega(2012)^- \to \bar{K}^0 \Xi^-)/{\cal B}(\Omega_{c}^0 \to \pi^+ \bar{K}^0 \Xi^-)$=(5.5$\pm$2.8(stat\mathrm{.})$\pm$ 0.7(syst.))%.