Improved Measurements of $D^{+}\to \eta e^{+}{\nu }_e$ and $D^{+}\to \eta {\mu }^{+}{\nu }_{\mu }$

BESIII Collaboration, M. Ablikim, M. N. Achasov +677

Using 20.3 fb${}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector, we measure the branching fractions of $D^{+}\to \eta e^{+}{\nu }_e$…