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Observation of the Decay D^{0}→K^{-}π^{+}e^{+}e^{-}.

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Author information

Affiliations

  • 1. Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France.
      Authors
    • Lees JP 1
    • Poireau V 1
    • Tisserand V 1
    (3 authors)
  • 2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona, Spain.
      Authors
    • Grauges E 2
    (1 author)
  • 3. INFN Sezione di Bari and Dipartimento di Fisica, Università di Bari, I-70126 Bari, Italy.
      Authors
    • Palano A 3
    (1 author)
  • 4. University of Bergen, Institute of Physics, N-5007 Bergen, Norway.
      Authors
    • Eigen G 4
    (1 author)
  • 5. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720, USA.
      Authors
    • Brown DN 5
    • Kolomensky YG 5
    (2 authors)
    • Show all (69)

ORCIDs linked to this article

Show all (31)

Physical Review Letters, 01 Mar 2019, 122(8):081802
https://doi.org/10.1103/physrevlett.122.081802 PMID: 30932586 

Abstract 

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}.

Full text links 

Read article at publisher's site: https://doi.org/10.1103/physrevlett.122.081802

Read article for free, from open access legal sources, via Unpaywall: http://link.aps.org/pdf/10.1103/PhysRevLett.122.081802Unpaywall

References 

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    Funding 

    Funders who supported this work.

    Alfred P. Sloan Foundation

      Bundesministerium für Bildung und Forschung

        Centre National de la Recherche Scientifique

          Commissariat à l’Énergie Atomique et aux Énergies Alternatives

            Deutsche Forschungsgemeinschaft

              H2020 Marie Sk?odowska-Curie Actions

                Instituto Nazionale di Fisica Nucleare

                  Ministerio de Economía y Competitividad

                    Ministry of Education and Science of the Russian Federation

                      National Science Foundation

                        Natural Sciences and Engineering Research Council of Canada

                          Research Council of Norway

                            Science and Technology Facilities Council (4)

                            Stichting voor Fundamenteel Onderzoek der Materie

                              U.S. Department of Energy

                                United States-Israel Binational Science Foundation