Observation of $D^0\to K_1(1270{)}^{-}{e}^{+}{\nu }_e$

BESIII Collaboration, M. Ablikim, M. N. Achasov +507

Using 2.93 fb${}^{-1}$ of $e^{+}{e}^{-}$ collision data taken with the BESIII detector at a center-of-mass energy of 3.773 $\mathrm{GeV}$, the observation of the $D^0\to K_1(1270{)}^{-}{e}^{+}{\nu }_e$ s…