First Observation of Inclusive $\mathit{B}$ Decays to the Charmed Strange Baryons ${\Xi }_{\mathit{c}}^0$ and ${\Xi }_{\mathit{c}}^{+}$

Using data collected in the region of the $\Upsilon \left(4S\right)$ resonance with the CLEO II detector operating at the Cornell Electron Storage Ring (CESR), we present the first observation of $B$ mesons decaying into the charmed strange baryons ${\Xi }_c^0$ and ${\Xi }_c^{+}$. We find $79\pm 27{\Xi }_c^0$ and $125\pm 28{\Xi }_c^{+}$ candidates from $B$ decays, leading to product branching fractions of $B(\overline{B}\to {\Xi }_c^{0}X)B({\Xi }_c^0\to {\Xi }^{-}{\pi }^{+})=(0.144\pm 0.048\pm 0.021)\times {10}^{-3\mathrm{}}$ and $B(\overline{B}\to {\Xi }_c^{+}X)B({\Xi }_C^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+})=(0.453\pm {0.096}_{-0.065}^{+0.085})\times {10}^{-3\mathrm{}}$.