Observation of the Doubly Cabibbo-Suppressed Decay $D^+_s \to K^+ K^+   \pi^-$

Belle Collaboration: B.R. Ko; E. Won

arXiv:0903.5126·hep-ex·November 18, 2014

Observation of the Doubly Cabibbo-Suppressed Decay $D^+_s \to K^+ K^+ \pi^-$

Belle Collaboration: B.R. Ko, E. Won

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TL;DR

This paper reports the first observation of a rare doubly Cabibbo-suppressed decay of the $D_s^+$ meson and provides improved measurements of a similar decay of the $D^+$ meson, using a large dataset from the Belle experiment.

Contribution

The study presents the first observation of the decay $D_s^+ o K^+K^+\pi^-$ and improves the measurement of $D^+ o K^+\pi^+\pi^-$ branching ratios, expanding knowledge of charm meson decays.

Findings

01

First observation of $D_s^+ o K^+K^+\pi^-$ decay.

02

Measured branching ratio $rac{(D_s^+ o K^+K^+\pi^-)}{(D_s^+ o K^+K^-\pi^+)} = (0.229 \pm 0.028 ext{(stat)} \pm 0.012 ext{(syst)}) ext{%}.

03

Improved measurement of $D^+ o K^+\pi^+\pi^-$ branching ratio.

Abstract

We report the first observation of the doubly Cabibbo-suppressed decay $D_{s}^{+} \to K^{+} K^{+} π^{-}$ using 605 fb $^{- 1}$ of data collected with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. The branching ratio with respect to its Cabibbo-favored counterpart $B (D_{s}^{+} \to K^{+} K^{+} π^{-})$ / $B (D_{s}^{+} \to K^{+} K^{-} π^{+})$ is (0.229 $\pm 0.028 \pm$ 0.012)%, where the first uncertainty is statistical and the second is systematic. We also report a significantly improved measurement of the doubly Cabibbo-suppressed decay $D^{+} \to K^{+} π^{+} π^{-}$ , with a branching ratio $B (D^{+} \to K^{+} π^{+} π^{-})$ / $B (D^{+} \to K^{-} π^{+} π^{+})$ =(0.569 $\pm 0.018 \pm$ 0.014)%.

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