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The BaBar measurements of the ratios ${\cal R}(D^{(*)})=\frac{{\cal B}(B \toD^{(*)} \tau {\bar \nu}_\tau)}{{\cal B}(B \to D^{(*)} \mu {\bar \nu}_\mu)}$deviate from the standard model expectation, while new results on the purelyleptonic $B \to \tau {\bar \nu}_\tau$ mode show a better consistency with thestandard model, within the uncertainties. In a new physics scenario, onepossibility to accomodate these two experimental facts consists in consideringan additional tensor operator in the effective weak hamiltonian. We study theeffects of such an operator in a set of observables, in semileptonic $B \toD^{(*)}$ modes as well as in semileptonic $B$ and $B_s$ decays to excitedpositive parity charmed mesons.

On the anomalous enhancement observed in $B \to D^{(*)} \, \tau \, {\bar \nu}_\tau $ decays