A Study of D0 --> K0(S) K0(S) X Decay Channels

Using data from the FOCUS experiment (FNAL-E831), we report on the decay of $D^0$ mesons into final states containing more than one $K^0_S$. We present evidence for two Cabibbo favored decay modes, $D^0\to K^0_SK^0_S K^- π^+$ and $D^0\to K^0_SK^0_S K^+ π^-$, and measure their combined branching fraction relative to $D^0\to \bar{K} ^0π^+π^-$ to be $\frac{Γ(D^0\to K^0_SK^0_SK^{\pm}π^{\mp})}{Γ(D^0\to \bar{K} ^0π^+π^-)}$ = 0.0106 $\pm$ 0.0019 $\pm$ 0.0010. Further, we report new measurements of $\frac{Γ(D^0\to K^0_SK^0_SK^0_S)}{Γ(D^0\to \bar{K} ^0π^+π^-)}$ = 0.0179 $\pm$ 0.0027 $\pm$ 0.0026, $\frac{Γ(D^0\to K^0\bar{K} ^0)}{Γ(D^0\to \bar{K} ^0π^+π^-)}$ = 0.0144 $\pm$ 0.0032 $\pm$ 0.0016, and $\frac{Γ(D^0\to K^0_SK^0_Sπ^+π^-)}{Γ(D^0\to \bar{K} ^0π^+π^-)}$ = 0.0208 $\pm$ 0.0035 $\pm$ 0.0021 where the first error is statistical and the second is systematic.

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