Studies of charmed strange baryons in the $\Lambda D$ final state at Belle

In this report, we discuss the discovery of ${\Xi }_c(3055{)}^0$, observed by its decay into the final-state $\Lambda D^0$, and present the first observation and evidence of the decays of ${\Xi }_c(3055{)}^{+}$ and ${\Xi }_c(3080{)}^{+}$ into $\Lambda D^{+}$. Furthermore, we perform a combined analysis of the $\Lambda D^{+}$ with the ${\Sigma }_c^{++}{K}^{-}$ and ${\Sigma }_c^{*++}{K}^{-}$ decay modes to measure the ratios of branching fractions, masses and widths with improved accuracy. We measure the ratios of branching fractions $B\left({\Xi }_c\right(3055{)}^{+}\to \Lambda D^{+})/B({\Xi }_c(3055{)}^{+}\to {\Sigma }_c^{++}{K}^{-})=5.09\pm 1.01\pm 0.76$, $B\left({\Xi }_c\right(3080{)}^{+}\to \Lambda D^{+})/B({\Xi }_c(3080{)}^{+}\to {\Sigma }_c^{++}{K}^{-})=1.29\pm 0.30\pm 0.15$, and $B\left({\Xi }_c\right(3080{)}^{+}\to {\Sigma }_c^{*++}{K}^{-})/B({\Xi }_c(3080{)}^{+}\to {\Sigma }_c^{++}{K}^{-})=1.07\pm 0.27\pm 0.04$, where the uncertainties are statistical and systematic. The analysis is performed using a $980{\mathrm{fb}}^{-1}$ data sample collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider.