Observation of the semimuonic decay D+→ωμ+νμ
Branching fraction
DOI:
10.1103/physrevd.101.072005
Publication Date:
2020-04-20T18:30:27Z
AUTHORS (489)
ABSTRACT
We report the first observation of semi-muonic decay $D^+\to \omega \mu^+\nu_\mu$ using an $e^+e^-$ collision data sample corresponding to integrated luminosity $2.93~\mathrm{fb}^{-1}$ collected with BESIII detector at a center-of-mass energy 3.773 GeV. The absolute branching fraction is measured be ${\mathcal B}_{D^+\to \omega\mu^+\nu_\mu}=(17.7\pm1.8_{\rm stat}\pm1.1_{\rm syst})\times 10^{-4}$. Its ratio world average value e^+\nu_e$ probes lepton flavor universality and it determined \mu^+\nu_\mu}/{\mathcal B}^{\rm PDG}_{D^+\to e^+\nu_e}=1.05\pm0.14$, in agreement standard model expectation within one deviation.
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