Lepton Universality and Lepton Flavour Violation tests at the B-factories
1 Scuola Normale Superiore, Pisa, Italy
2 INFN sezione di Pisa, Pisa, Italy
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Published online: 26 April 2016
We review the experimental status of the lepton universality tests and lepton flavour violation searches after the completion of the data-taking and most of the data analysis of the B-factories BABAR and Belle. The universality of the Standard Model charged weak couplings has been confirmed and moderately improved in precision by the B-factories results. Lepton Flavour violation in the τ lepton decays has been searched in several decay modes and no evidence has been found. We set 90% confidence level upper limits on the Lepton Flavour violating branching ratios in the 10−7–10−8 range, greatly extending the previous limits set mainly by CLEO in the 10−6 range.
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