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The current world averages of the ratios $R_{D^{(*)}}$ are about $4\sigma$away from their Standard Model prediction. These measurements indicate towardsthe violation of lepton flavor universality in $b\rightarrow c\,l\,\bar{\nu}$decay. The different new physics operators, which can explain the $R_{D^{(*)}}$measurements, have been identified previously. We show that a simultaneousmeasurement of the polarization fractions of $\tau$ and $D^*$ and the angularasymmetries $A_{FB}$ and $A_{LT}$ in $B\rightarrow D^*\tau\bar{\nu}$ decay candistinguish all the new physics amplitudes and hence uniquely identify theLorentz structure of new physics.

Resolving $R_D$ and $R_{D^*}$ anomalies