Study of the decay mode D^0 -> K-K+pi-pi+

the FOCUS Collaboration: J.Link; et al

arXiv:hep-ex/0411031·hep-ex·November 26, 2008

Study of the decay mode D^0 -> K-K+pi-pi+

the FOCUS Collaboration: J.Link, et al

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TL;DR

This paper reports a new measurement of the branching ratio for the decay D^0 -> K^-K^+ ho^- ho^+ and analyzes its resonant substructure, highlighting the dominance of D^0 -> K_1^+ K- modes.

Contribution

It provides the first precise measurement of the branching ratio for D^0 -> K^-K^+ ho^- ho^+ and details its resonant decay components.

Findings

01

Branching ratio measured as 0.0295 ± 0.0011 (stat.) ± 0.0008 (syst.)

02

Dominant contribution from D^0 -> K_1^+ K- modes

03

Analysis of resonant substructure performed

Abstract

Using data from the FOCUS (E831) experiment at Fermilab, we present a new measurement of the branching ratio for the Cabibbo-favored decay mode $D^{0} \to K^{-} K^{+} π^{-} π^{+}$ . From a sample of $2669 \pm 101$ fully reconstructed $D^{0} \to K^{-} K^{+} π^{-} π^{+}$ events, we measure $Γ (D^{0} \to K^{-} K^{+} π^{-} π^{+}) /Γ (D^{0} \to K^{-} π^{-} π^{+} π^{+}) = 0.0295 \pm 0.0011 (s t a t .) \pm 0.0008 (sy s t .)$ . 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.

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