Search for lepton-flavor violating decays $D^{0}\rightarrow X^{0}e^{\pm}μ^{\mp}$

We present a search for seven lepton-flavor-violating neutral charm decays of the type $D^{0}\rightarrow X^{0} e^{\pm} μ^{\mp}$, where $X^{0}$ represents a $π^{0}$, $K^{0}_{\rm S}$, $\bar{K^{*0}}$, $ρ^{0}$, $ϕ$, $ω$, or $η$ meson. The analysis is based on $468$ fb$^{-1}$ of $e^+e^-$ annihilation data collected at or close to the $Υ(4S)$ resonance with the BaBar detector at the SLAC National Accelerator Laboratory. No significant signals are observed, and we establish 90\% confidence level upper limits on the branching fractions in the range $(5.0 - 22.5)\times 10^{-7}$. The limits are between one and two orders of magnitude more stringent than previous measurements.

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