Speaker
Description
Charged-current semileptonic b-hadron decays are a prime arena for precision tests of the Standard Model and sensitive probes of physics beyond it. At LHCb, large heavy-flavour yields enable measurements of both high-rate modes (with light leptons) and lepton-universality–testing channels with taus, alongside detailed studies of differential and angular observables. Interpreting these results hinges on non-perturbative QCD information, most notably hadronic form factors and their shapes, whose uncertainties directly propagate into extractions of CKM parameters and effective-field-theory constraints on short-distance couplings. This contribution presents a selection of recent LHCb results on b → c ℓ ν decays (ℓ = μ, τ), highlighting their impact on global phenomenology and emphasizing the role of heavy-flavour QCD inputs in controlling the dominant theory systematics.
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