Observation of the decay $D^0\to K^{-}{\pi }^{+}{e}^{+}{e}^{-}$

We report the observation of the rare charm decay $D^0\rightarrow K^-\pi^+e^+e^-$,basedon$468$fb$^{-1}$of$e^+e^-$ annihilation data collected at or close to the center-of-mass energy of the $Y(4S)$ resonance with the BaBar detector at the SLAC National Accelerator Laboratory. We find the branching fraction in the invariant mass range $0.675< m(e^+e^-) < 0.875 GeV/c^2$oftheelectron-positronpairtobe${\cal B}(D^0\rightarrow K^-\pi^+e^+e^-) = (4.0\pm0.5\pm0.2\pm0.1) \times 10^{-6}$, where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty in the branching fraction of the decay $D^0\rightarrow K^-\pi^+\pi^+\pi^-$ used as a normalization mode. The significance of the observation corresponds to 9.7 standard deviations including systematic uncertainties. This result is consistent with the recently reported $D^0\to K^{-}{\pi }^{+}{\mu }^{+}{\mu }^{-}$ branching fraction, measured in the same invariant mass range, and with the value expected in the Standard Model. In a set of regions of $m(e^{+}{e}^{-})$ where long-distance effects are potentially small, we determine a 90% confidence level upper limit on the branching fraction $\mathcal{B}(D^0\to K^{-}{\pi }^{+}{e}^{+}{e}^{-})<3.1\times {10}^{-6}$.