| Abstract |
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We present measurements of the semileptonic decays
B- --> D0 tau- nubar, B- --> D*0 tau- nubar,
B0bar --> D+ tau- nubar, and B0bar --> D*+ tau- nubar,
which are potentially sensitive to non--Standard Model amplitudes.
The data sample comprises 232x10^6 Upsilon(4S) --> BBbar decays
collected with the BaBar detector.
From a combined fit to B- and B0bar channels, we obtain the branching fractions
B(B --> D tau- nubar) = (0.86 +/- 0.24 +/- 0.11 +/- 0.06)%
and B(B --> D* tau- nubar) = (1.62 +/- 0.31 +/- 0.10 +/- 0.05)%
(normalized for the B0bar),
where the uncertainties are statistical, systematic, and normalization-mode-related.
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