Observation of the electromagnetic Dalitz decay $D^{\ast 0}\to D^0{e}^{+}{e}^{-}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +504

Based on 3.19 fb${}^{-1}$ of $e^{+}{e}^{-}$ collision data accumulated at the center-of-mass energy 4.178 GeV with the BESIII detector operating at the BEPCII collider, the electromagnetic…