Observation of the Decay D0 →k-π+e+e-

(B a B ar Collaboration)

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Abstract

We report the observation of the rare charm decay D0→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 (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/c2 of the electron-positron pair to be B(D0→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 D0→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 D0→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(D0→K-π+e+e-)<3.1×10-6.

Original languageEnglish
Article number081802
JournalPhysical Review Letters
Volume122
Issue number8
DOIs
StatePublished - 27 Feb 2019

Funding

FundersFunder number
Stichting voor Fundamenteel Onderzoek der Materie
Marie Curie EIF
Ministry of Education and Science
USA-Israel
National Science Foundation
CNRS-IN2P3
Instituto Nazionale di Fisica Nucleare
Norsk Sykepleierforbund
Ministerio de Economía y Competitividad
Bundesministerium für Bildung und Forschung
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
Deutsche Forschungsgemeinschaft
European Commission
California Department of Fish and Game
NFR
U.S. Department of Energy
Bundesministerium für Bildung und Frauen
Bloom's Syndrome Foundation
British Skin Foundation
Natural Sciences and Engineering Research Council of Canada
Alfred P. Sloan Foundation
NSERC (Canada), CEA
Foundation for Fundamental Research on Matter
Science and Technology Facilities CouncilST/N000331/1, ST/N000455/1, ST/N000420/1
UK Research and Innovation53706

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