2007

New Search for tau -> mu gamma and tau -> e gamma Decays at Belle

Hayasaka, K.

Understand

We report on a search for the lepton flavor violating tau- -> mu- gamma and tau- -> e- gamma decays based on 535/fb of data accumulated at the Belle experiment.

  • No signal is found and we set 90% confidence level upper limits on the branching ratios Br(tau- -> mu- gamma) < 4.5x10^-8 and Br(tau- -> e- gamma) < 1.2x10^-7.

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  • We restricted s s to be positive in the previous analysis. Due to BG fluctuations, however, s s can be negative as we found in this case. Our previous upper limit is then reduced by a factor of ≃ 3 \simeq 3 when negative s s is allowed

    Cited in the paper.

  • A method to incorporate the systematic uncertainties into a branching ratio is discussed in Ref. [ 10 ]

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