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Upper Bound on the Decay<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mstyle displaystyle="false"><mml:mi>τ</mml:mi><mml:mo>→</mml:mo><mml:mi>μ</mml:mi><mml:mi>γ</mml:mi></mml:mstyle></mml:math>from the Belle Detector
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 …