Measurement of the branching fraction of ${\Lambda }_c^{+}\to p\omega$ decay at Belle

Abstract

Using 980.6 $\mathrm{f}{\mathrm{b}}^{-1}$ 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 ${\Lambda }_c^{+}\to p\omega$. A clear ${\Lambda }_c^{+}$ signal is observed for ${\Lambda }_c^{+}\to p\omega$ with a statistical significance of 9.1 standard deviations, and we measure the ratio of branching fractions $\mathcal{B}({\Lambda }_c^{+}\to p\omega )/\mathcal{B}({\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+})=(1.32\pm 0.12(\mathrm{stat})\pm 0.10(\mathrm{syst}))\times 10^{-2}$, from which we infer the branching fraction $\mathcal{B}({\Lambda }_c^{+}\to p\omega )=(8.27\pm 0.75(\mathrm{stat})\pm 0.62(\mathrm{syst})\pm 0.42(\mathrm{ref}))\times 10^{-4}$. The first quoted uncertainty is statistical, the second systematic, and the third from the reference mode ${\Lambda }_c^{+}\to p{K}^{-}{\pi }^{+}$.

Comments: 9 pages, 3 figures, 1 table; accepted for publication as a Regular Article in Physical Review D