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[en] A measurement of B0- B0 mixing from a sample of ∼500 000 hadronic Z0 decays recorded with the OPAL detector at LEP is presented. A signal for mixing is observed and an average B0- B0 mixing parameter χ=0.125-0.016+0.017±0.015 is extracted from the excess of like sign lepton pairs in events containing two lepton candidates
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