Direct measurement of the absolute branching fraction for $D^{+}\to {\bar{K}}^0{\mu }^{+}{\nu }_{\mu }$ and determination of $\Gamma (D^0\to K^{-}{\mu }^{+}{\nu }_{\mu })/\Gamma (D^{+}\to {\bar{K}}^0{\mu }^{+}{\nu }_{\mu })$

Abstract

The absolute branching fraction for the decay $D^{+}\to {\bar{K}}^0{\mu }^{+}{\nu }_{\mu }$ is determined using $5321\pm 149\pm 160$ singly tagged $D^{-}$ sample from the data collected around 3.773 GeV with the BESII detector at the BEPC collider. In the system recoiling against the singly tagged $D^{-}$ mesons, $28.7\pm 6.4$ events for $D^{+}\to {\bar{K}}^0{\mu }^{+}{\nu }_{\mu }$ are observed. These yield the absolute branching fraction to be $BF(D^{+}\to {\bar{K}}^0{\mu }^{+}{\nu }_{\mu })=(10.3\pm 2.3\pm 0.8)$. The ratio of the two partial widths for the decays $D^0\to K^{-}{\mu }^{+}{\nu }_{\mu }$ and $D^{+}\to {\bar{K}}^0{\mu }^{+}{\nu }_{\mu }$ is determined to be $\Gamma (D^0\to K^{-}{\mu }^{+}{\nu }_{\mu })/\Gamma (D^{+}\to {\bar{K}}^0{\mu }^{+}{\nu }_{\mu })=0.87\pm 0.24\pm 0.15$.

arXiv comment6 pages, 5 figures

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• Direct Measurement of the Branching Fraction for the Decay of $D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e$ and Determination of $\Gamma (D^0\to K^{-}{e}^{+}{\nu }_e)/\Gamma (D^{+}\to {\bar{K}}^0{e}^{+}{\nu }_e)$
• Direct Measurement of the Pseudoscalar Decay Constant fD+
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Cited by in corpus (7)

• Improved measurement of the absolute branching fraction of $D^{+}\to {\bar{K}}^0{\mu }^{+}{\nu }_{\mu }$
• On the origin of the D0 like-sign dimuon charge asymmetry
• Determinations of form factors for semileptonic $D\to K$ decays and leptoquark constraints
• Improved measurements of $D^0\to K^{-}{\ell }^{+}{\nu }_{\ell }$ and $D^{+}\to {\bar{K}}^0{\ell }^{+}{\nu }_{\ell }$
• Direct Measurements of Absolute Branching Fractions for D0 and D+ Inclusive Semimuonic Decays
• Probing the R-parity violating supersymmetric effects in the exclusive $c\to d/s\ell {\nu }_{\ell }$ decays
• Direct Measurements of the Branching Fractions for Inclusive $K^{\pm }$ and Inclusive Semileptonic Decays of $D^{+}$ and $D^0$ Mesons