Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-10-08
Physics
High Energy Physics
High Energy Physics - Experiment
7 pages, 6 figures
Scientific paper
Based on the data sample of 33 pb$^{-1}$ collected at and around 3.773 GeV with the BES-II detector at the BEPC collider, the absolute branching fractions for the semileptonic decays $D^0\to K^-\mu^+\nu_\mu$ and $D^0\to\pi^-\mu^+\nu_\mu$ have been measured. In the system recoiling against $7584\pm198\pm341$ singly tagged $\bar D^0$ mesons, $87.2\pm13.6$ events for $D^0\to K^-\mu^+\nu_\mu$ and $9.3\pm7.4$ events for $D^0\to\pi^-\mu^+\nu_\mu$ are observed. These yield the absolute branching fractions to be $BF(D^0\to K^-\mu ^+\nu_\mu)= (3.55\pm0.56\pm0.59)%$ and $BF(D^0\to\pi^-\mu^+\nu_\mu)= (0.38\pm0.30\pm0.10)%$. The measured branching fraction for $D^0\to K^-\mu ^+\nu_\mu$ was previously used to determine the ratio $\Gamma(D^0\to K^-\mu^+\nu_\mu)/ \Gamma(D^+\to \bar K^0\mu^+\nu_\mu)$ combining the previously measured branching fraction for $D^+\to \bar K^0\mu^+\nu_\mu$ by the BES Collaboration.
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