# FOCUS Document 762-v7

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# A Study of $D^0\rightarrow K^0_SK^0_SX$ Decay Channels

Document #:
FOCUS-doc-762-v7
Document type:
Publication
Submitted by:
David Lopes Pegna
Updated by:
David Lopes Pegna
Document Created:
15 Oct 2004, 14:18
Contents Revised:
09 Dec 2004, 14:12
03 Feb 2005, 15:00
Actually Revised:
24 Aug 2005, 15:05
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Abstract:
Using data from the FOCUS experiment(FNAL-E831), we report on
the decay of $D^0$ mesons into final states containing two K$^0_S$. We
present the discovery of Cabibbo favored decay modes $D^0\rightarrow K^0_SK^0_S\pi^+K^-$ and $D^0\rightarrow K^0_SK^0_S\pi^-K^+$ and measure
their combined branching fractions relative to $D^0\rightarrow \overline{K}\,\!^0\pi^+\pi^-$
to be
$\frac{\Gamma(D^0\rightarrow K^0_SK^0_SK^{\pm}\pi^{\mp})}{\Gamma(D^0\rightarrow \overline{K}\,\!^0\pi^+\pi^-)}$ =
0.0106 $\pm$ 0.0019 $\pm$ 0.0010. Further, we report new measurements of
$\frac{\Gamma(D^0\rightarrow K^0_SK^0_SK^0_S)}{\Gamma(D^0\rightarrow \overline{K}\,\!^0\pi^+\pi^-)}$ = 0.0179 $\pm$ 0.0027 $\pm$ 0.0026,
$\frac{\Gamma(D^0\rightarrow K^0\overline{K}\,\!^0)}{\Gamma(D^0\rightarrow \overline{K}\,\!^0\pi^+\pi^-)}$ = 0.0144 $\pm$ 0.0032 $\pm$ 0.0016, and
$\frac{\Gamma(D^0\rightarrow K^0_SK^0_S\pi^+\pi^-)}{\Gamma(D^0\rightarrow \overline{K}\,\!^0\pi^+\pi^-)}$ = 0.0208 $\pm$ 0.0035 $\pm$ 0.0021 where the first error is statistical and the second
is systematic.
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Keywords:
KSKSX Paper
Journal References:
Published in Phys. Lett. B vol. 607 pg. 59.
Published in hep-ex/0410077.
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