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

Abstract

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

11 pages, 3 figures, typos corrected