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- W2996317591 abstract "We report the observation of the rare charm decay $D^0rightarrow K^-pi^+e^+e^-$ and a search for nine lepton-number-violating (LNV) and three lepton-flavor-violating (LFV) neutral charm decays of the type $D^0rightarrow h^{prime-}h^{-}l^{prime+}l^+$ and $D^0rightarrow h^{prime-}h^+ l^{primepm}l^{mp}$, where $h$ and $h^{prime}$ represent a $K$ or $pi$ meson and $l$ and $l^{prime}$ an electron or muon. The analysis is based on $468$ fb$^{-1}$ of $e^+e^-$ annihilation data collected at or close to the $Upsilon(4S)$ resonance with the BaBar detector at the SLAC National Accelerator Laboratory. We find the $D^0rightarrow K^-pi^+e^+e^-$ branching fraction in the invariant mass range $0.675< m(e^+e^-) < 0.875$ GeV/c$^{2}$ of the electron-positron pair to be $mathcal{B}(D^0rightarrow K^-pi^+e^+e^-) = (4.0 pm 0.5 pm 0.2 pm 0.1) times 10^{-6}$, where the first uncertainty is statistical, the second systematic, and the third due to the uncertainty in the branching fraction of the decay $D^0rightarrow K^-pi^+pi^+pi^-$ used as a normalization mode. In a set of regions of $m(e^+e^-)$ where long-distance effects are potentially small, we determine a 90% confidence level (C.L.) upper limit on the branching fraction $mathcal{B}(D^0rightarrow K^-pi^+pi^+pi^-) < 3.1times 10^{-6}$. No significant signal is observed for any of the LFV and LNV modes, and we establish 90% C.L. upper limits on the branching fractions in the range $(1.0 - 30.6)times 10^{-7}$. The limits are between one and three orders of magnitude more stringent than previous measurements." @default.
- W2996317591 created "2019-12-26" @default.
- W2996317591 creator A5087597559 @default.
- W2996317591 date "2019-10-15" @default.
- W2996317591 modified "2023-09-24" @default.
- W2996317591 title "Search for lepton-flavour violating and lepton-number violating decays of the $D^0$ meson and observation of $D^0to K^-pi^+e^+e^-$" @default.
- W2996317591 doi "https://doi.org/10.22323/1.367.0073" @default.
- W2996317591 hasPublicationYear "2019" @default.
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