Observation of the Semileptonic Decays B→D^{*}τ^{-}ν[over ¯]_{τ} and Evidence for B→Dτ^{-}ν[over ¯]_{τ}

B Aubert, P Del Amo Sanchez, Christopher Hawkes, Alan Watson

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Abstract

We present measurements of the semileptonic decays B--> D-0 tau(-)(nu) over bar (tau), B--> D-*0 tau(-)(nu) over bar (tau), (B) over bar (0)-> D+tau(-)(nu) over bar (tau), and (B) over bar (0)-> D*+tau(-)(nu) over bar (tau), which are potentially sensitive to non-standard model amplitudes. The data sample comprises 232x10(6) Upsilon(4S)-> B (B) over bar decays collected with the BABAR detector. From a combined fit to B- and (B) over bar (0) channels, we obtain the branching fractions B(B -> D tau(-)(nu) over bar (tau))=(0.86 +/- 0.24 +/- 0.11 +/- 0.06)% and B(B -> D-*tau(-)(nu) over bar (tau))=(1.62 +/- 0.31 +/- 0.10 +/- 0.05)% (normalized for the (B) over bar (0)), where the uncertainties are statistical, systematic, and normalization-mode-related.
Original languageEnglish
Article number021801
JournalPhysical Review Letters
Volume100
Issue number2
Early online date1 Jan 2008
DOIs
Publication statusPublished - 1 Jan 2008

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