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The latest BaBar measurements of the ratios ${\calR}(D^{(*)})=\displaystyle{\frac{{\cal B}(B \to D^{(*)} \tau {\bar\nu}_\tau)}{{\cal B}(B \to D^{(*)} \mu {\bar \nu}_\mu)}}$ deviate from theStandard Model predictions at the global level of 3.4$\sigma$. A possibility toreproduce these experimental ratios without affecting other modes which do notshow similar deviations is to consider new physics scenarios producing anadditional tensor operator in the effective weak Hamiltonian. I describe theimpact of such an operator in semileptonic $B \to D^{(*)}$ modes and insemileptonic $B$ and $B_s$ decays to excited positive parity charmed mesons. Inparticular, I discuss the most effective observables able to discriminate newphysics from the Standard Model.

New Physics Scenarios in $b \to c \ell {\bar \nu}_\ell$ decays