Exclusive weak B decays involving $τ$ lepton in the relativistic quark model

Semileptonic and leptonic B decays are analyzed in the framework of the relativistic quark model. Special attention is payed to the decays involving $τ$ lepton. It is found that the calculated particular decay branching fractions are consistent with available experimental data within error bars. However, the predicted and recently measured ratios $R(D^{(*)})$ of the $B\to D^{(*)}τν_τ$ and $B\to D^{(*)}lν_l$ branching fractions differ by 1.75$σ$ for $R(D)$ and by 2.4$σ$ for $R(D^*)$.

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