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.

Observation of the semileptonic decays B -> D(*)tau(-)(nu)over-bar(tau) and evidence for B -> D tau(-)(nu)over-bar(tau)

PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;Pompili A.;
2008-01-01

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11586/59678
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