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Direct Measurement of the Branching Fraction for the Decay of $D^+ \to \bar K^0 e^+ν_e$ and Determination of $Γ(D^0 \to K^-e^+ν_e)/ Γ(D^+ \to \bar K^0 e^+ν_e)$

BES Collaboration
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Abstract

The absolute branching fraction for the decay $D^+ \to \bar K^0 e^+ν_e$ is determined using $5321\pm 149 \pm 160$ singly tagged $D^-$ sample from the data collected around 3.773 GeV with the BES-II detector at the BEPC collider. In the system recoiling against the singly tagged $D^-$ meson, $34.4\pm 6.1$ events for $D^+ \to \bar K^0 e ^+ν_e$ is observed. Those yield the absolute branching fraction to be $BF(D^+ \to \bar K^0 e^+ν_e)=(8.95 \pm 1.59\pm 0.67)%$. The ratio of the two partial widths for the decays of $D^0 \to K^-e^+ν_e$ and $D^+ \to \bar K^0 e ^+ν_e$ is determined to be $ Γ(D^0 \to K^-e^+ν_e)/ Γ(D^+ \to \bar K^0 e^+ν_e) = 1.08\pm 0.22 \pm 0.07$.

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BES Collaboration. 2004-12-23. Direct Measurement of the Branching Fraction for the Decay of $D^+ \to \bar K^0 e^+ν_e$ and Determination of $Γ(D^0 \to K^-e^+ν_e)/ Γ(D^+ \to \bar K^0 e^+ν_e)$. https://doi.org/10.1016/j.physletb.2004.12.040

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