Search for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>D</mml:mi><mml:mn>0</mml:mn></mml:msup><mml:mo>−</mml:mo><mml:msup><mml:mover accent="true"><mml:mi>D</mml:mi><mml:mo>¯</mml:mo></mml:mover><mml:mn>0</mml:mn></mml:msup></mml:math>mixing using doubly flavor tagged semileptonic decay modes

We have searched for ${D}^{0}\ensuremath{-}{\overline{D}}^{0}$ mixing in ${D}^{*+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{D}^{0}$ decays with ${D}^{0}\ensuremath{\rightarrow}{K}^{(*)}e\ensuremath{\nu}$ in a sample of ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}c\overline{c}$ events produced near 10.58 GeV. The charge of the slow pion from charged ${D}^{*}$ decay tags the charm flavor at production, and it is required to be consistent with the flavor of a fully reconstructed second charm decay in the same event. We observe 3 mixed candidates compared to 2.85 background events expected from simulation. We ascribe a 50% systematic uncertainty to this expected background rate. We find a central value for the mixing rate of $0.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. Using a frequentist method, we set corresponding 68% and 90% confidence intervals at $(\ensuremath{-}5.6,7.4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ and $(\ensuremath{-}13,12)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, respectively.

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