Measurement of the branching fraction of ${\mathrm{\Xi }}_c^0\to {\mathrm{\Lambda }}_c^{+}{\pi }^{-}$ at Belle

Based on a data sample of 983 fb${}^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we present the study of the heavy-flavor-conserving decay ${\mathrm{\Xi }}_c^0\to {\mathrm{\Lambda }}_c^{+}{\pi }^{-}$ with ${\mathrm{\Lambda }}_c^{+}$ reconstructed via its $p{K}^{-}{\pi }^{+}$ decay mode. The branching fraction ratio $\mathcal{B}({\mathrm{\Xi }}_c^0\to {\mathrm{\Lambda }}_c^{+}{\pi }^{-})\mathrm{/}\mathcal{B}({\mathrm{\Xi }}_c^0\to {\mathrm{\Xi }}^{-}{\pi }^{+})$ is measured to be $0.38\pm 0.04\pm 0.04$. Combing with the world average value of $\mathcal{B}({\mathrm{\Xi }}_c^0\to {\mathrm{\Xi }}^{-}{\pi }^{+})$, the branching fraction $\mathcal{B}({\mathrm{\Xi }}_c^0\to {\mathrm{\Lambda }}_c^{+}{\pi }^{-})$ is deduced to be $(0.54\pm 0.05\pm 0.05\pm 0.12)\mathrm{\%}$. Here, the uncertainties above are statistical, systematic, and from $\mathcal{B}({\mathrm{\Xi }}_c^0\to {\mathrm{\Xi }}^{-}{\pi }^{+})$, respectively.