Testing the Standard Model in $B\to D\tau \bar{\nu }$ decay with minimal theory input

Damir Becirevic, Nejc Kosnik, Andrey Tayduganov

Recent experimental results for the ratio of the branching fractions of $\bar{B}\to D^{(\ast )}\tau {\nu }_{\tau }$ and $B\to D^{(\ast )}\mu {\nu }_{\mu }$ decays came as a surprise and lead to a discussion of possi…