Abstract
We present Standard Model predictions for lepton flavour universality ratios of inclusive B → X(c)\( \ell {\overline{\nu}}_{\ell } \). For the ℓ = μ, e, these ratios are very close to unity as expected. For the τ mode, we update the SM prediction for the branching ratio including power-corrections in the heavy-quark expansion up to 1/\( {m}_b^3 \). These inclusive ratios serve as an important cross-check of the exclusive B → D(*)\( \ell {\overline{\nu}}_{\ell } \) modes, in which tensions exists between the predictions and measurements in those modes.
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Rahimi, M., Vos, K.K. Standard Model predictions for lepton flavour universality ratios of inclusive semileptonic B decays. J. High Energ. Phys. 2022, 7 (2022). https://doi.org/10.1007/JHEP11(2022)007
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DOI: https://doi.org/10.1007/JHEP11(2022)007