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We discuss the impact of the recent untagged analysis of B-0 -> D*l (nu) over bar (l)) decays by the Belle Collaboration on the extraction of the CKM element vertical bar V-c(b)vertical bar and provide updated SM predictions for the b -> c tau nu observables R(D*), P-tau, and F-L(D*). The value of vertical bar V-cb vertical bar that we find is about 2 sigma from the one from inclusive semileptonic B decays, and is very sensitive to the slope of the form factor at zero recoil which should soon become available from lattice calculations. (C) 2019 The Authors. Published by Elsevier B.V.

The extraction of the Cabibbo-Kobayashi-Maskawa (CKM) matrix from flavour observables can be affected by physics beyond the Standard Model (SM). We provide a general roadmap to take this into account, which we apply to the case of the Standard Model Effective Field Theory (SMEFT). We choose a set of four input observables that determine the four Wolfenstein parameters, and discuss how the effects of dimension-six operators can be included in their definition. We provide numerical values and confidence intervals for the CKM parameters, and compare them with the results of CKM fits obtained in the SM context. Our approach allows one to perform general SMEFT analyses in a consistent fashion, independently of any assumptions about the way new physics affects flavour observables. We discuss a few examples illustrating how our approach can be implemented in practice.