Evidence for an excess of B̄→D( *)τ -ν ̄τ decays

doi:10.1103/PHYSREVLETT.109.101802

Open AccessJournal ArticleDOI

Evidence for an excess of B̄→D( *)τ -ν ̄τ decays

J. P. Lees, +365 more

- 06 Sep 2012 -

Physical Review Letters

- Vol. 109, Iss: 10, pp 101802

TLDR

In this article, the BaBar data sample was used to investigate the sensitivity of BaBar ratios to new physics contributions in the form of a charged Higgs boson in the type II two-Higgs doublet model.

Abstract:

Based on the full BaBar data sample, we report improved measurements of the ratios R(D(*)) = B(B -> D(*) Tau Nu)/B(B -> D(*) l Nu), where l is either e or mu. These ratios are sensitive to new physics contributions in the form of a charged Higgs boson. We measure R(D) = 0.440 +- 0.058 +- 0.042 and R(D*) = 0.332 +- 0.024 +- 0.018, which exceed the Standard Model expectations by 2.0 sigma and 2.7 sigma, respectively. Taken together, our results disagree with these expectations at the 3.4 sigma level. This excess cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model. We also report the observation of the decay B -> D Tau Nu, with a significance of 6.8 sigma.

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