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Zhang","submitted_at":"2016-12-02T01:03:01Z","abstract_excerpt":"We report the first measurement of the $\\tau$ lepton polarization $P_\\tau(D^*)$ in the decay $\\bar{B} \\rightarrow D^* \\tau^- \\bar{\\nu}_\\tau$ as well as a new measurement of the ratio of the branching fractions $R(D^{*}) = \\mathcal{B}(\\bar {B} \\rightarrow D^* \\tau^- \\bar{\\nu}_\\tau) / \\mathcal{B}(\\bar{B} \\rightarrow D^* \\ell^- \\bar{\\nu}_\\ell)$, where $\\ell^-$ denotes an electron or a muon, and the $\\tau$ is reconstructed in the modes $\\tau^- \\rightarrow \\pi^- \\nu_\\tau$ and $\\tau^- \\rightarrow \\rho^- \\nu_\\tau$. 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