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We have searched for lepton flavour violation in Z0 boson decays into lepton pairs, Z0→μτ, Z0→eτ, and Z0→eμ. The data sample is based on an integrated luminosity of 10.4 pb-1 corresponding to 370 000 Z0's produced. We obtain upper limits on the branching ratios of 4.8×10-5 for the μτ, 3.4×10-5 for the eτ and 2.4×10-5 for the eμ decay modes at the 95% confidence level.
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Adeva et al. (1991) studied this question.
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