PoS - Proceedings of Science
Volume 340 - The 39th International Conference on High Energy Physics (ICHEP2018) - Parallel: Quark and Lepton Flavor Physics
Tests of lepton universality with semitauonic b-quark decays
O. Leroy*  on behalf of the LHCb collaboration
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Published on: August 02, 2019
Tests of Lepton Flavor Universality are presented using ratios of branching fractions $\BR(B \to X_c \tau^+ \nu_{\tau})/\BR(B \to X_c \mu^+\nu_{\mu})$, with $X_c=D^{*-}$ or $\jpsi$, using the data collected by the LHCb experiment during 2011 and 2012. When combined with the results from the BaBar and Belle experiments, the Standard Model is challenged at the $3.8\sigma$ level.
We also give implications and prospects of these key measurements.
DOI: https://doi.org/10.22323/1.340.0126
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