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Using 980.6 $\rm fb^{-1}$ of data collected with the Belle detector operatingat the KEKB asymmetric-energy $e^+e^-$ collider, we present a measurement ofthe branching fraction of the singly Cabibbo-suppressed decay $\Lambda_c^+ \top \omega$. A clear $\Lambda_c^+$ signal is observed for $\Lambda_c^+ \to p\omega$ with a statistical significance of 9.1 standard deviations, and wemeasure the ratio of branching fractions ${\cal B}(\Lambda_c^+ \to p\omega)/{\cal B}(\Lambda_c^+ \to p K^- \pi^+) = (1.32 \pm 0.12 (\rm stat) \pm0.10 (\rm syst))\times 10^{-2}$, from which we infer the branching fraction${\cal B}(\Lambda_c^+ \to p \omega) = (8.27 \pm 0.75 (\rm stat) \pm 0.62 (\rmsyst) \pm 0.42 (\rm ref))\times 10^{-4}$. The first quoted uncertainty isstatistical, the second systematic, and the third from the reference mode$\Lambda_c^+ \to p K^- \pi^+$.

Measurement of the branching fraction of $\Lambda_c^+ \to p \omega$ decay at Belle