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Using 0.8 million D^+D^- pairs collected with the CLEO-c detector at thepsi(3770) resonance, we have searched for flavor-changing neutral current andlepton-number-violating decays of D^+ mesons to final states with dielectrons.We find no indication of either, obtaining 90% confidence level upper limits ofB(D^+ -> \pi^+ e^+ e^-) < 7.4 X 10^{-6}$, B(D^+ -> \pi^- e^+ e^+) < 3.6 X10^{-6}$, B(D^+ -> K^+ e^+ e^-) < 6.2 X 10^{-6}$, and B(D^+ -> K^- e^+ e^+) <4.5 X 10^{-6}$.

physical review letters

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Search for Rare and Forbidden DecaysD+→h±e∓e+