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- W3098081148 abstract "The large samples of tau decays available from CLEO and the four LEP experiment have resulted in new, precise measurements of the leptonic branching ratios of the $tau$. The experimental techniques to obtain these results are reviewed with special emphasis on the DELPHI measurement. World averages are found to be Be = (17.81 +/- 0.06) % and Bmu = (17.36 +/- 0.06) %. These results are consistent with universality in the charged current couplings to a precision of about 0.25 %. The branching ratio measurements can also be used to constrain the low energy parameter eta. It is shown that the sensitivity to eta depends on details of the momentum acceptance for muon identification in the different experiments. Assuming universality in the couplings, the estimate eta = 0.012 +/- 0.024 is obtained." @default.
- W3098081148 created "2020-11-23" @default.
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- W3098081148 date "1999-04-01" @default.
- W3098081148 modified "2023-09-26" @default.
- W3098081148 title "Summary on tau leptonic branching ratios and universality" @default.
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- W3098081148 doi "https://doi.org/10.1016/s0920-5632(99)00439-9" @default.
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