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)
CALDERINI, GIOVANNI;ANGELINI, CARLO;BATIGNANI, GIOVANNI;BETTARINI, STEFANO;CARPINELLI, MASSIMO;CERVELLI, ALBERTO;FORTI, FRANCESCO;GIORGI, MARCELLO;MARCHIORI, GIOVANNI;NERI, NICOLA;PAOLONI, EUGENIO;RIZZO, GIULIANA;
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
