Search for $D^0$ meson decays to ${\pi }^{+}{\pi }^{-}{e}^{+}{e}^{-}$ and $K^{+}{K}^{-}{e}^{+}{e}^{-}$ final states

Abstract

A search for $D^0$ meson decays to the ${\pi }^{+}{\pi }^{-}{e}^{+}{e}^{-}$ and $K^{+}{K}^{-}{e}^{+}{e}^{-}$ final states is reported using a sample of proton-proton collisions collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb${}^{-1}$. The decay $D^0\to {\pi }^{+}{\pi }^{-}{e}^{+}{e}^{-}$ is observed for the first time when requiring that the two electrons are consistent with coming from the decay of a $\varphi$ or ${\rho }^0/\omega$ meson. The corresponding branching fractions are measured relative to the $D^0\to K^{-}{\pi }^{-}[e^{+}{e}^{-}{]}_{{\rho }^0/\omega }$ decay, where the two electrons are consistent with coming from the decay of a ${\rho }^0$ or $\omega$ meson. No evidence is found for the $D^0\to K^{+}{K}^{-}{e}^{+}{e}^{-}$ decay and world-best limits are set on its branching fraction. The results are compared to, and found to be consistent with, the branching fractions of the $D^0\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ and $D^0\to K^{+}{K}^{-}{\mu }^{+}{\mu }^{-}$ decays recently measured by LHCb and confirm lepton universality at the current precision.

arXiv commentAll figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/1611/ (LHCb public pages)

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Cited by in corpus (2)

• Search for resonance-enhanced $CP$ and angular asymmetries in the ${\Lambda }_c^{+}\to p{\mu }^{+}{\mu }^{-}$ decay at LHCb
• Measurement of the $D^0\to K^{-}{\pi }^{+}{e}^{+}{e}^{-}$ branching fraction and search for $D^0\to {\pi }^{+}{\pi }^{-}{e}^{+}{e}^{-}$ and $D^0\to K^{+}{K}^{-}{e}^{+}{e}^{-}$ decays at Belle