A Search for lepton flavor violation in Z0 decays

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1993) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 298, n° 1-2, p. 247-256 (1993)

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A search for lepton flavour violation through the decays Z0 → eμ, eτ and μτ was made with the DELPHI detector at LEP, using a sample corresponding to an integrated luminosity of 11.2 pb−1. The number of candidates was consistent with the estimated background. The upper limit on the branching ratio (at 95% confidence level) forZ0 → eμ was 3.2 × 10−5, for Z0 → eτ was 10.8 × 10−5 and for Z0 → μτ was 13.5 × 10−5.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1993). A Search for lepton flavor violation in Z0 decays. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 298(1-2), 247-256. https://doi.org/10.1016/0370-2693(93)91737-8 (Original work published 1993)