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

Abstract

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 $2.93{\mathrm{fb}}^{-1}$ collected with the BESIII detector at a center-of-mass energy of 3.773 GeV. The absolute branching fraction of the $D^{+}\to \omega {\mu }^{+}{\nu }_{\mu }$ decay is measured to be ${\mathcal{B}}_{D^{+}\to \omega {\mu }^{+}{\nu }_{\mu }}=(17.7\pm 1.8_{\mathrm{stat}}\pm 1.1_{\mathrm{syst}})\times 10^{-4}$. Its ratio with the world average value of the branching fraction of the $D^{+}\to \omega e^{+}{\nu }_e$ decay probes lepton flavor universality and it is determined to be ${\mathcal{B}}_{D^{+}\to \omega {\mu }^{+}{\nu }_{\mu }}/{\mathcal{B}}_{D^{+}\to \omega e^{+}{\nu }_e}^{\mathrm{PDG}}=1.05\pm 0.14$, in agreement with the standard model expectation within one standard deviation.

arXiv comment8 pages, 2 figures

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