Using a data sample of 1 475 000 Z → qq̄(γ) events collected during 1994 with the L3 detector at LEP, we have studied the purely leptonic decays of heavy flavour mesons, and . A signal is observed in the invariant mass distribution M(γDs−) corresponding to the decay sequence , , . The branching fraction for decays is measured to be . No signal of decays is observed in the data, corresponding to an upper limit on the branching franction at 90% CL.
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