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An Upper Bound on the Decay tau -> mu gamma from Belle
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hep-ex
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gammabelledecayupperaccumulatedboundbranchingconfidence
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We have performed a search for the lepton-flavor-violating decay tau -> mu gamma using a data sample of 86.3fb^{-1} accumulated by the Belle detector at KEK. No evidence for a signal is seen, and we set an upper limit for the branching fraction of B(tau -> mu gamma) < 3.1 x 10^{-7} at the 90% confidence level.
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