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Besides being important to determine Standard Model parameters such as theCKM matrix elements $|V_{cb}|$ and $|V_{ub}|$, semileptonic $B$ decays seemalso promising to reveal new physics (NP) phenomena, in particular inconnection with the possibility of uncovering lepton flavour universality (LFU)violating effects. In this view, it could be natural to connect the tensions inthe inclusive versus exclusive determinations of $|V_{cb}|$ to the anomalies inthe ratios $R(D^{(*)})$ of decay rates into $\tau$ vs $\mu, e$. However, thequestion has been raised about the role of the parametrization of the hadronic$B \to D^{(*)}$ form factors in exclusive $B$ decay modes. We focus on thefully differential angular distributions of $\bar B \to D^* \ell^-{\bar\nu}_\ell$ with $D^* \to D \pi$ or $D^* \to D \gamma$, the latter mode beingimportant in the case of $B_s \to D_s^*$ decays. We show that the angularcoefficients in the distributions can be used to scrutinize the role of theform factor parametrization and to pin down deviations from SM. As an exampleof a NP scenario, we include a tensor operator in the $b \to c$ semileptoniceffective Hamiltonian, and discuss how the angular coefficients allow toconstruct observables sensitive to this structure, also defining ratios usefulto test LFU.

Scrutinizing $\bar B \to D^*(D \pi) \ell^- \bar \nu_\ell$ and $\bar B \to D^*(D \gamma) \ell^- \bar \nu_\ell$ in search of new physics footprints

Scrutinizing $\bar B \to D^(D \pi) \ell^- \bar \nu_\ell$ and $\bar B \to D^(D \gamma) \ell^- \bar \nu_\ell$ in search of new physics footprints