Search for Lepton Flavor Violation in ? (3S) ?e ±µ±

(BaBar Collaboration)

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We report on the first search for electron-muon lepton flavor violation (LFV) in the decay of a b quark and b antiquark bound state. We look for the LFV decay ?(3S)?e±µ± in a sample of 118 million ?(3S) mesons from 27 fb-1 of data collected with the BABAR detector at the SLAC PEP-II e+e- collider operating with a 10.36 GeV center-of-mass energy. No evidence for a signal is found, and we set a limit on the branching fraction B[?(3S)?e±µ±]<3.6×10-7 at 90% C. L. This result can be interpreted as a limit ?NP/gNP2>80 TeV on the energy scale ?NP divided by the coupling-squared gNP2 of relevant new physics (NP).

Original languageEnglish
Article number091804
JournalPhysical Review Letters
Issue number9
StatePublished - 4 Mar 2022


FundersFunder number
A. P. Sloan Foundation
Marie Curie EIF
NSERC (Canada), CEA
National Science Foundation
U.S. Department of Energy
Alfred P. Sloan Foundation
SLAC National Accelerator Laboratory
Science and Technology Facilities Council
British Skin Foundation
European Commission
Deutsche Forschungsgemeinschaft
Stichting voor Fundamenteel Onderzoek der Materie
Bundesministerium für Bildung und Forschung
Ministerio de Economía y Competitividad
Instituto Nazionale di Fisica Nucleare
Ministry of Education and Science


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