Observation of $D^{+}\to \hat{I}{\cdot }^{\prime }\hat{I}{¼}^{+}\hat{I}{½}_{\hat{I}}¼$ and First Study of $D^{+}\to \hat{I}{\cdot }^{\prime }{\ell }^{+}\hat{I}{½}_{\ell }$ Decay Dynamics

BESIII Collaboration, M. Ablikim, M. N. Achasov +648

Using $20.3\mathrm{f}{\mathrm{b}}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at the center-of-mass energy 3.773\,GeV with the BESIII detector, we report the first observation of the semileptonic…