Measurement of the Semileptonic Decays B --> D tau nubar and B --> D* tau nubar

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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

Cited in the paper.

Throughout this letter, charge-conjugate modes are implied

Cited in the paper.

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

Cited in the paper.

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 − → D 0 ​ ℓ − ​ ν ¯ ℓ ) = ( 2.21 ± 0.15 ) % {\cal B}(B^{-}\rightarrow D^{0}\ell^{-}\overline{\nu}_{\ell})=(2.21\pm 0.15)\% and ℬ ⁡ ( B − → D ∗ 0 ​ ℓ − ​ ν ¯ ℓ ) = ( 5.85 ± 0.20 ) % {\cal B}(B^{-}\rightarrow D^{*0}\ell^{-}\overline{\nu}_{\ell})=(5.85\pm 0.20)\%

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