Using the CLEO III detector at CESR, we have measured the branching ratio of the decay ${\Xi }_c^0\to {\mathrm{pK}}^{-}{K}^{-}{\pi }^{+}$ relative to ${\Xi }_c^0\to {\Xi }^{-}{\pi }^{+}.$ We find $\mathcal{B}({\Xi }_c^0\to {\mathrm{pK}}^{-}{K}^{-}{\pi }^{+})/\mathcal{B}({\Xi }_c^0\to {\Xi }^{-}{\pi }^{+})=0.35\mathrm{}\pm 0.06\left(\mathrm{stat}\right)\pm 0.03\left(\mathrm{syst}\right).\mathrm{}$ In the resonant substructure of this mode, we find evidence for ${\Xi }_c^0$ decays to $p\overline{K^{*}}{\mathrm{}\left(892\right)\mathrm{}}^0{K}^{-},$ and measure $\mathcal{B}({\Xi }_c^0\to p\overline{K^{*}}{\mathrm{}\left(892\right)\mathrm{}}^0{K}^{-})\times \mathcal{B}(\overline{K^{*}}{\mathrm{}\left(892\right)\mathrm{}}^0\to K^{-}{\pi }^{+})/\mathcal{B}({\Xi }_c^0\to {\Xi }^{-}{\pi }^{+})=0.14\mathrm{}\pm 0.03\left(\mathrm{stat}\right)\pm 0.01\left(\mathrm{syst}\right)$ and $\mathcal{B}({\Xi }_c^0\to {\mathrm{pK}}^{-}{K}^{-}{\pi }^{+})/\mathcal{B}({\Xi }_c^0\to {\Xi }^{-}{\pi }^{+})=0.21\mathrm{}\pm 0.04\left(\mathrm{stat}\right)\pm 0.02\left(\mathrm{syst}\right)$ for the $\mathrm{n}\mathrm{o}\mathrm{n}-\overline{K^{*}}{\mathrm{}\left(892\right)\mathrm{}}^0{\Xi }_c^0\to {\mathrm{pK}}^{-}{K}^{-}{\pi }^{+}$ decays.

• Received 3 September 2003

DOI:https://doi.org/10.1103/PhysRevD.69.052004