An upper limit on the lifetime dierence of short-and long-lived B 0 s mesons has been obtained using an inclusive bottom hadron sample from 2 million hadronic Z decays collected by the L3 experiment at LEP. A lifetime t has been performed on data samples separately enriched in neutral and charged b hadrons. An experimental upper limit on the decay rate dierence of short-and long-lived B 0 s mesons of
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