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.
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Titolo: | Observation of the semileptonic decays B -> D-*tau(-)(nu)over-bar(tau) and evidence for B -> D tau(-)(nu)over-bar(tau) |
Autori: | |
Data di pubblicazione: | 2008 |
Rivista: | |
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. |
Handle: | http://hdl.handle.net/11392/533312 |
Appare nelle tipologie: | 03.1 Articolo su rivista |