# FOCUS Document 872-v1

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# Study of the decay mode $D^0\toK^-K^+\pi^+\pi^-$

Document #:
FOCUS-doc-872-v1
Document type:
Publication
Submitted by:
Eduardo Luiggi
Updated by:
Eduardo Luiggi
Document Created:
23 Aug 2005, 15:00
Contents Revised:
23 Aug 2005, 15:00
24 Mar 2005, 16:20
Actually Revised:
23 Aug 2005, 16:22
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• Public document
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Using data from the FOCUS (E831) experiment at Fermilab, we present a new measurement of the branching ratio for the Cabibbo-favored decay mode $D^0 \to K^-K^+\pi^-\pi^+$. From a sample of $2669 \pm 101$ fully reconstructed $D^0 \to K^-K^+\pi^-\pi^+$ events, we measure $\Gamma(D^0 \to K^-K^+\pi^-\pi^+)/\Gamma(D^0 \to K^-\pi^-\pi^+\pi^+) = 0.0295 \pm 0.0011(stat.) \pm 0.0008(syst.)$.
A coherent amplitude analysis has been performed to determine the resonant substructure of this decay mode. This analysis reveals a dominant contribution from $D^0 \to K_1^+ K-$ modes.