New limits on $K_L$,S→${\mathrm{\pi }}^0$${\mathrm{e}}^{+}$${\mathrm{e}}^{\mathrm{-}}$

Data taken in a Fermilab experiment designed to measure to CP-violation parameter ε’/ε from a study of K→2π decays were used to look for the as yet unseen decay modes $K_L$,S→${\mathrm{\pi }}^0$ ${\mathrm{e}}^{+}$ ${\mathrm{e}}^{\mathrm{-}}$. The detector was optimized for the detection of kaon decays with four electromagnetic showers in the final state. The results (90% confidence) are branching ratios <4.2×${10}^{\mathrm{-}8}$ and <4.5×${10}^{\mathrm{-}5}$ for $K_L$→${\pi }^0$ $e^{+}$ $e^{\mathrm{-}}$ and $K_S$→${\pi }^0$ $e^{+}$ $e^{\mathrm{-}}$, respectively.