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We present the first observation of the $\Omega_{c}^{0} \to \Omega^{-}\mu^{+} \nu_{\mu}$ decay and present measurements of the branching fractionratios of the $\Omega_{c}^{0} \to \Omega^{-} \ell^{+} \nu_{\ell}$ decayscompared to the reference mode $\Omega_{c}^{0} \to \Omega^{-} \pi^+$, ($\ell =e$ or $\mu$). This analysis is based on 89.5 fb$^{-1}$, 711 fb$^{-1}$, and121.1 fb$^{-1}$ data samples collected with the Belle detector at the KEKBasymmetric-energy $e^+e^-$ collider at the center-of-mass energies of 10.52GeV, 10.58 GeV, and 10.86 GeV, respectively. The $\Omega_{c}^{0}$ signal yieldsare extracted by fitting $M_{\Omega^{-} \ell^{+}}$ and $M_{\Omega^{-}\pi^+}$spectra. The branching fraction ratios ${\cal B}(\Omega_{c}^{0} \to \Omega^{-}e^{+} \nu_{e})/{\cal B}(\Omega_{c}^{0} \to \Omega^{-} \pi^+)$ and ${\calB}(\Omega_{c}^{0} \to \Omega^{-} \mu^{+} \nu_{\mu})/{\cal B}(\Omega_{c}^{0} \to\Omega^{-} \pi^+)$ are measured to be $1.98 \pm0.13~({\rm stat.}) \pm0.08~({\rm syst.})$ and $ 1.94 \pm 0.18~({\rm stat.}) \pm 0.10~({\rm syst.})$,respectively. The ratio of ${\cal B}(\Omega_{c}^{0} \to \Omega^{-} e^{+}\nu_{e})/{\cal B}(\Omega_{c}^{0} \to \Omega^{-} \mu^{+} \nu_{\mu})$ is measuredto be $1.02 \pm 0.10~({\rm stat.}) \pm 0.02~({\rm syst.})$, which is consistentwith the expectation of lepton flavor universality.

physical review. d/physical review. d.

First test of Lepton Flavor Universality in the charmed baryon decays  $\Omega^{0}_{c} \to \Omega^{-} \ell^{+} \nu_{\ell}$ using data of the Belle  experiment