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We search for the rare decay $D^+\to D^0 e^+\nu_{e}$, using a data set withan integrated luminosity of 2.93 $\rm fb^{-1}$ collected at $\sqrt{s}=3.773$GeV with the BESIII detector operating at the BEPCII storage rings. No signalsare observed. We set the upper limit on the branching fraction for $D^+\to D^0e^+\nu_e$ to be $1.0\times 10^{-4}$ at the 90\% confidence level.

Search for the rare decay $D^+ \to D^0 e^+\nu_e$