Observation of the Semileptonic Decays B --> D* tau nubar and Evidence for B --> D tau nubar

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Charge-conjugate modes are implied throughout

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Throughout this letter, we use the symbol ℓ \ell to refer only to the light charged leptons e e and μ \mu . The symbol D ( ∗ ) D^{(*)} refers either to a D D or a D ∗ D^{*} meson

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This constraint follows from isospin symmetry in both the signal and normalization modes but is more general

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We use PDG to normalize the four individual branching fractions. For the B − B^{-} – B ¯ 0 \kern 1.79993pt\overline{\kern-1.79993ptB}{}^{0} -constrained measurement, we use our own averages of the values in PDG : ℬ ( B ¯ → 0 D + ℓ − ν ¯ ℓ ) = ( 2.07 ± 0.14 ) % {\cal B}(\kern 1.79993pt\overline{\kern-1.79993ptB}{}^{0}\rightarrow D^{+}\ell^{-}\overline{\nu}_{\ell})=(2.07\pm 0.14)\% and ℬ ( B ¯ → 0 D ∗ ⁣ + ℓ − ν ¯ ℓ ) = ( 5.46 ± 0.18 ) % {\cal B}(\kern 1.79993pt\overline{\kern-1.79993ptB}{}^{0}\rightarrow D^{*+}\ell^{-}\overline{\nu}_{\ell})=(5.46\pm 0.18)\%

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