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| Main Author: | |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.26879 |
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| _version_ | 1866914517149024256 |
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| author | Fazzini, Davide |
| author_facet | Fazzini, Davide |
| contents | The Standard Model (SM) predicts the universality of lepton couplings with the electroweak gauge bosons. Semileptonic decays of $b$-hadrons provide a powerful framework for testing the SM and probing possible New Physics effects. In particular, the processes mediated by charged-current interactions benefit from a relatively large branching fractions and theoretically well-controlled hadronic matrix elements. This contribution presents three recent results from the LHCb experiment: the first measurement of the ratio of branching fractions $\mathcal{R}(D^{**})$ using $B^{-} \to D^{**0} τ^{-} \barν_τ$ decays, the determination of the branching fraction for $Λ\to p μ^{-} \barν_μ$ and the extraction of form-factor parameters from $B^0 \to D^{*-} μ^{+} ν_μ$ decays. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_26879 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Flavour changing charged current decays at LHCb Fazzini, Davide High Energy Physics - Experiment The Standard Model (SM) predicts the universality of lepton couplings with the electroweak gauge bosons. Semileptonic decays of $b$-hadrons provide a powerful framework for testing the SM and probing possible New Physics effects. In particular, the processes mediated by charged-current interactions benefit from a relatively large branching fractions and theoretically well-controlled hadronic matrix elements. This contribution presents three recent results from the LHCb experiment: the first measurement of the ratio of branching fractions $\mathcal{R}(D^{**})$ using $B^{-} \to D^{**0} τ^{-} \barν_τ$ decays, the determination of the branching fraction for $Λ\to p μ^{-} \barν_μ$ and the extraction of form-factor parameters from $B^0 \to D^{*-} μ^{+} ν_μ$ decays. |
| title | Flavour changing charged current decays at LHCb |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2604.26879 |