Measurement of the $D^{\ast -}$ polarization in the decay $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$

Belle Collaboration, A. Abdesselam, I. Adachi +457

We report the first measurement of the $D^{\ast -}$ meson polarization in the decay $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$ using the full data sample of 772$\times 10^6$ $B\bar{B}$ pairs recorded…