Search for $D^0\to K^{-}\eta e^{+}{\nu }_e$, $D^{+}\to K_S^0\eta e^{+}{\nu }_e$ and $D^{+}\to \eta \eta e^{+}{\nu }_e$ decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +640

By analyzing $e^{+}{e}^{-}$ annihilation data corresponding to an integrated luminosity of 7.93 fb${}^{-1}$, collected at the center-of-mass energy of 3.773 GeV with the BESIII detector, w…