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Standard Model predictions for Lepton Flavour Universality ratios of inclusive semileptonic $B$ decays

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arxiv 2207.03432 v1 pith:QASL6JXV submitted 2022-07-07 hep-ph

classification hep-ph
keywords ratiosinclusivepredictionsflavourleptonmodelmodesstandard
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

We present Standard Model predictions for lepton flavour universality ratios of inclusive $B\to X_{(c)} \ell \bar\nu_\ell$. For the $\ell=\mu,e$, these ratios are very close to unity as expected. For the $\tau$ 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 $B\to D^{(*)}\ell\bar\nu_\ell$ modes, in which tensions exists between the predictions and measurements in those modes.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Total decay rates of $B$ mesons at NNLO-QCD

    hep-ph 2024-12 conditional novelty 7.0 of 10

    At NNLO in QCD, the heavy quark expansion predicts the B+, Bd, and Bs decay widths and semileptonic branching fractions within experimental uncertainties, with a systematic 4% shortfall in the central width values.

  2. Predictions for $b$-baryon lifetimes at NNLO-QCD

    hep-ph 2026-07 accept novelty 6.0 of 10

    NNLO-QCD corrections to the free b-quark decay and NLO corrections to dimension-five operators reduce uncertainties in HQE predictions for b-baryon lifetimes, yielding excellent agreement with experiment.

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