Observation of the semileptonic decays $D^0\to K_S^0{\pi }^{-}{\pi }^0{e}^{+}{\nu }_e$ and $D^{+}\to K_S^0{\pi }^{+}{\pi }^{-}{e}^{+}{\nu }_e$

BESIII Collaboration, M. Ablikim, M. N. Achasov +611

By analyzing $e^{+}{e}^{-}$ annihilation data corresponding to an integrated luminosity of 2.93 $\mathrm{f}{\mathrm{b}}^{-1}$ collected at a center-of-mass energy of 3.773 GeV with the \text{BESIII} det…