The deviation of the measurement of $R_{D}$ ($R_{D^{*}}$) from the Standard Model (SM) expectation is $2.3\sigma$ ($3.1\sigma$). $R_{D}$ ($R_{D^{*}}$) is the ratio of the branching fraction of $\overline{B} \rightarrow D\tau\overline{\nu}_{\tau}$ ($\overline{B} \rightarrow D^{*}\tau\overline{\nu}_{\tau}$) to that of $\overline{B} \rightarrow Dl\overline{\nu}_{l}$ ($\overline{B} \rightarrow D^{*}l\overline{\nu}_{l}$), where $l = e$ or $\mu$... (read more)

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