Some Cabibbo-suppressed decays of theD0meson

Using data from the Fermilab photoproduction experiment E691, we have measured branching ratios for the Cabibbo-suppressed decays $D^0\to {\overline{K}}^0{K}^{+}{\pi }^{-}$, $D^0\to K^0{K}^{-}{\pi }^{+}$, $D^0\to K^{-}{K}^{+}{\pi }^{-}{\pi }^{+}$, and $D^0\to {\pi }^{+}{\pi }^{+}{\pi }^{-}{\pi }^{-}$. The data show evidence for several quasi-two-body decays including $D^0\to K^{*+}{K}^{-}$ and $D^0\to {\overline{K}}^{*0\mathrm{}}{K}^{*0\mathrm{}}$, but not $D^0\to K^{*-}{K}^{+}$. The relative rates of the charged decays indicates that final-state mesons containing virtual-$W^{+}$-decay quarks are more likely to emerge as vector mesons than are those containing the spectator quarks. The high rate observed for $D^0\to {\overline{K}}^{*0\mathrm{}}{K}^{*0\mathrm{}}$ indicates that hadronic final-state interactions play a measurable role in charm decays.