Measurement of the $\tau$ lepton polarization and $R(D^{\ast })$ in the decay $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$

S. Hirose, T. Iijima, I. Adachi +191

We report the first measurement of the $\tau$ lepton polarization $P_{\tau }(D^{\ast })$ in the decay $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$ as well as a new measurement of the ratio of the branch…