arxiv: 1903.03102 · v1 · ★pith:E3EDGNOMnew · submitted 2019-03-07 · ✦ hep-ex
Measurement of the D^(ast-) polarization in the decay B⁰ to D^(ast -)τ^+ν_(τ)
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We report the first measurement of the $D^{\ast -}$ meson polarization in the decay $B^0 \to D^{*-} \tau^+\nu_{\tau}$ using the full data sample of 772$\times 10^6$ $B\bar{B}$ pairs recorded with the Belle detector at the KEKB electron-positron collider. Our result, $F_L^{D^\ast} = 0.60 \pm 0.08 ({\rm stat}) \pm 0.04 ({\rm sys})$, where $F_L^{D^\ast}$ denotes the $D^{\ast-}$ meson longitudinal polarization fraction, agrees within about $1.7$ standard deviations of the standard model prediction.
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