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We discuss the possibility of using the observables deduced from the angulardistribution of the $B\to D^{(\ast)} \ell\bar{\nu}$ decays to test the effectsof lepton flavor universality violation (LFUV). We show that the measurement ofeven a subset of these observables could be very helpful in distinguishing theLorentz structure of the New Physics contributions to these decays. To do so weuse the low energy effective theory in which besides the Standard Modelcontribution we add all possible Lorentz structures with the couplings (Wilsoncoefficients) that are determined by matching theory with the measured ratios$R{(D^{(\ast)})}^\mathrm{exp}$. We argue that even in the situation in whichthe measured $R{(D^{(\ast)})}^\mathrm{exp}$ becomes fully compatible with theStandard Model, one can still have significant New Physics contributions thesize of which could be probed by measuring the observables discussed in thispaper and comparing them with their Standard Model predictions.

Lepton Flavor Universality tests through angular observables of $\overline{B}\to D^{(\ast)}\ell\overline{\nu}$ decay modes