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Evidence for an excess of B -> D(*) Tau Nu decays

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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Submitted on : Friday, May 25, 2012 - 10:27:56 AM
Last modification on : Tuesday, November 16, 2021 - 4:56:32 AM

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J. P. Lees, V. Poireau, V. Tisserand, D. Bernard, M. Verderi, et al.. Evidence for an excess of B -> D(*) Tau Nu decays. Physical Review Letters, American Physical Society, 2012, 109, pp.101802. ⟨10.1103/PhysRevLett.109.101802⟩. ⟨in2p3-00701319⟩



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