Using $980.6{\mathrm{fb}}^{-1}$ of data collected with the Belle detector operating at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we present a measurement of the branching fraction of the singly Cabibbo-suppressed decay ${\mathrm{\Lambda }}_c^{+}\to p\omega$. A clear ${\mathrm{\Lambda }}_c^{+}$ signal is observed for ${\mathrm{\Lambda }}_c^{+}\to p\omega$ with a statistical significance of 9.1 standard deviations, and we measure the ratio of branching fractions $\mathcal{B}({\mathrm{\Lambda }}_c^{+}\to p\omega )/\mathcal{B}({\mathrm{\Lambda }}_c^{+}\to p{K}^{-}{\pi }^{+})=(1.32\pm 0.12(\mathrm{stat})\pm 0.10(\mathrm{syst}))\times {10}^{-2}$, from which we infer the branching fraction $\mathcal{B}({\mathrm{\Lambda }}_c^{+}\to p\omega )=(8.27\pm 0.75(\mathrm{stat})\pm 0.62(\mathrm{syst})\pm 0.42(\mathrm{ref}))\times {10}^{-4}$. The first quoted uncertainty is statistical, the second systematic, and the third from the reference mode ${\mathrm{\Lambda }}_c^{+}\to p{K}^{-}{\pi }^{+}$.

• Received 25 August 2021
• Accepted 23 September 2021

DOI:https://doi.org/10.1103/PhysRevD.104.072008

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Published by the American Physical Society