Observation of the Semileptonic Decays B --> D* tau nubar and Evidence for B --> D tau nubar

et al; the BABAR Collaboration: B. Aubert

arxiv: 0709.1698 · v1 · submitted 2007-09-11 · ✦ hep-ex

Observation of the Semileptonic Decays B --> D* tau nubar and Evidence for B --> D tau nubar

the BABAR Collaboration: B. Aubert , et al This is my paper

classification ✦ hep-ex

keywords nubartau-b0bardecayssemileptonicamplitudesbabarbbbar

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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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Lepton Flavor Universality tests through angular observables of $\overline{B}\to D^{(\ast)}\ell\overline{\nu}$ decay modes
hep-ph 2019-07 unverdicted novelty 5.0

Angular observables in B→D(*)ℓν decays can distinguish Lorentz structures of new physics contributions fitted to measured R(D(*)) ratios, even when those ratios agree with the Standard Model.