Observation of the semi-muonic decay $D^{+}\to \omega {\mu }^{+}{\nu }_{\mu }$

BESIII Collaboration

We report the first observation of the semi-muonic decay $D^{+}\to \omega {\mu }^{+}{\nu }_{\mu }$ using an $e^{+}{e}^{-}$ collision data sample corresponding to an integrated luminosity of $2.93~\mathrm{fb}^{-1…