Precision measurements of $B(D^{+}\to {\mu }^{+}{\nu }_{\mu })$, the pseudoscalar decay constant $f_{D^{+}}$, and the quark mixing matrix element $|V_{\mathrm{cd}}|$

BESIII Collaboration, M. Ablikim, M. N. Achasov +375

We report a measurement of the branching fraction $B(D^{+}\to {\mu }^{+}{\nu }_{\mu })=[3.71\pm 0.19(\mathrm{stat})\pm 0.06(\mathrm{sys})]\times 10^{-4}$ based on 2.92 $\mathrm{f}{\mathrm{b}}^{-1}$ of data a…