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J. A.Waterlaat, M.Watson, N. K.Websdale, D.Wei, Y.Wendel, J.Westhenry, B. D. C.White, C.Whitehead, M.Whiter, E.Wiederhold, A. R.Wiedner, D.Wilkinson, G.Wilkinson, M. K.Williams, M.Williams, M. J.Williams, M. R. J.Williams, R.Williams, Z.Wilson, F. F.Winn, M.Wislicki, W.Witek, M.Witola, L.Wormser, G.Wotton, S. A.Wu, H.Wu, J.Wu, X.Wu, Y.Wu, Z.Wyllie, K.Xian, S.Xiang, Z.Xie, Y.Xing, T. X.Xu, A.Xu, L.Xu, L.Xu, M.Xu, Z.Xu, Z.Xu, Z.Yang, K.Yang, S.Yang, X.Yang, Y.Yang, Z.Yeroshenko, V.Yeung, H.Yin, H.Yin, X.Yu, C. Y.Yu, J.Yuan, X.Yuan, YZaffaroni, EttoreZavertyaev, M.Zdybal, M.Zenesini, F.Zeng, C.Zeng, M.Zhang, C.Zhang, D.Zhang, J.Zhang, L.Zhang, S.Zhang, S.Zhang, Y.Zhang, Y. Z.Zhang, Z.Zhao, Y.Zhelezov, A.Zheng, S. Z.Zheng, X. Z.Zheng, Y.Zhou, T.Zhou, X.Zhou, Y.Zhovkovska, V.Zhu, L. Z.Zhu, X.Zhu, X.Zhukov, V.Zhuo, J.Zou, Q.Zuliani, D.Zunica, Gianluca2025-05-072025-05-072025-05-062025-05-0510.1103/PhysRevD.111.L091101https://infoscience.epfl.ch/handle/20.500.14299/249942A search for D 0 meson decays to the π + π − 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 → π + π − e + e − is observed for the first time when requiring that the two electrons are consistent with coming from the decay of a ϕ or ρ 0 / ω meson. The corresponding branching fractions are measured relative to the D 0 → K − π − [ e + e − ] ρ 0 / ω decay, where the two electrons are consistent with coming from the decay of a ρ 0 or ω meson. No evidence is found for the D 0 → 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 → π + π − μ + μ − and D 0 → K + K − μ + μ − decays recently measured by LHCb and confirm lepton universality at the current precision.entext::journal::journal article::research article