Model independent analysis of $b\to (c,u)\tau \nu$ leptonic and semileptonic decays

Rupak Dutta, Anupama Bhol

Latest measurement of the ratio of branching ratios $R_D=\mathcal{B}(B\to D\tau \nu )/\mathcal{B}(B\to Dl\nu )$ and $R_{D^{\ast}} = \mathcal B(B \to D^{\ast}\,τ\,ν)/\mathcal B(B \t…