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  • Observation of the Decay D^{0}→K^{-}π^{+}e^{+}e^{-}
    Lees, J P; Tisserand, V; Schroeder, T; Mattison, T S; McKenna, J A; Blinov, V E; Druzhinin, V P; Serednyakov, S I; Skovpen, Yu I; Todyshev, K Yu; Gary, J W; Long, O; Panduro Vazquez, W; Cheng, C H; Echenard, B; Kim, J; Ongmongkolkul, P; Huard, Z; Meadows, B T; Sun, L; Verderi, M; Bettoni, D; Fioravanti, E; Santoro, V; Peruzzi, I M; Zallo, A; Patrignani, C; Mallik, U; Gritsan, A V; Arnaud, N; Davier, M; Le Diberder, F; Lutz, A M; Lange, D J; Coleman, J P; Bevan, A J; Di Lodovico, F; Sacco, R; Davis, C L; Schubert, K R; Barlow, R J; Lafferty, G D; Jawahery, A; Robertson, S H; Neri, N; Summers, D J; Taras, P; De Nardo, G; Raven, G; Jessop, C P; Kass, R; Margoni, M; Akar, S; Ben-Haim, E; Calderini, G; Ocariz, J; Biasini, M; Manoni, E; Rossi, A; Carpinelli, M; Casarosa, G; Chrzaszcz, M; Paoloni, E; Rama, M; Rizzo, G; Ferrarotto, F; Ferroni, F; Pilloni, A; Bünger, C; Grünberg, O; Heß, M; Voß, C; Adye, T; Emery, S; Convery, M R; Field, R C; Fulsom, B G; Kim, P; Luitz, S; MacFarlane, D B; Muller, D R; Roodman, A; Va'vra, J; Purohit, M V; Ahmed, H; Burchat, P R; Ernst, J A; Guttman, N; Peimer, D R; Soffer, A; Spanier, S M; Izen, J M; Filippi, A; Albert, J; Kowalewski, R; Roney, J M; Gershon, T J; Harrison, P F; Prepost, R; Wu, S L

    Physical review letters, 2019-Mar-01, 20190301, Letnik: 122, Številka: 8
    Journal Article

    We report the observation of the rare charm decay D^{0}→K^{-}π^{+}e^{+}e^{-}, based on 468  fb^{-1} of e^{+}e^{-} annihilation data collected at or close to the center-of-mass energy of the ϒ(4S) resonance with the BABAR detector at the SLAC National Accelerator Laboratory. We find the branching fraction in the invariant mass range 0.675<m(e^{+}e^{-})<0.875  GeV/c^{2} of the electron-positron pair to be B(D^{0}→K^{-}π^{+}e^{+}e^{-})=(4.0±0.5±0.2±0.1)×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^{0}→K^{-}π^{+}π^{+}π^{-} used as a normalization mode. The significance of the observation corresponds to 9.7 standard deviations including systematic uncertainties. This result is consistent with the recently reported D^{0}→K^{-}π^{+}μ^{+}μ^{-} branching fraction, measured in the same invariant mass range, and with the value expected in the standard model. In a set of regions of m(e^{+}e^{-}), where long-distance effects are potentially small, we determine a 90% confidence level upper limit on the branching fraction B(D^{0}→K^{-}π^{+}e^{+}e^{-})<3.1×10^{-6}.

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