Direct Measurement of the Branching Fraction for the Decay of $D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e$ and Determination of $\Gamma (D^0\to K^{-}{e}^{+}{\nu }_e)/\Gamma (D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e)$

Abstract

The absolute branching fraction for the decay $D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e$ 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 $D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e$ is observed. Those yield the absolute branching fraction to be $BF(D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e)=(8.95\pm 1.59\pm 0.67)$. The ratio of the two partial widths for the decays of $D^0\to K^{-}{e}^{+}{\nu }_e$ and $D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e$ is determined to be $\Gamma (D^0\to K^{-}{e}^{+}{\nu }_e)/\Gamma (D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e)=1.08\pm 0.22\pm 0.07$.

arXiv comment6 pages, 6 figures, Submitted to Physics Letters B

References in corpus (2)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Direct Measurements of the Branching Fractions for $D^0\to K^{-}{e}^{+}{\nu }_e$ and $D^0\to {\pi }^{-}{e}^{+}{\nu }_e$ and Determinations of the Form Factors $f_{+}^K(0)$ and $f_{+}^{\pi }(0)$

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• Measurements of the observed cross sections for $e^{+}{e}^{-}\to$ light hadrons at $\sqrt{s}=$ 3.773 and 3.650 GeV
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• Determinations of form factors for semileptonic $D\to K$ decays and leptoquark constraints
• Experimental studies of the ${\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}{\pi }^0$, $K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}{\pi }^0$ and $p\bar{p}{\pi }^{+}{\pi }^{-}{\pi }^0$ final states produced in $e^{+}{e}^{-}$ annihilation at $\sqrt{s}=$ 3.773 and 3.650 GeV
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