DOCUMENT METADATA
SLAC Publication: SLAC-PUB-15028
SLAC Release Date: October 9, 2012
Evidence for an excess of B to D(*) Tau Nu decays
Lees, J. P..
DOI: 10.1103/PhysRevLett.109.101802
Based on the full BaBar data sample, we report improved measurements of the ratios R(D(*)) = B(B to D(*) Tau Nu)/B(B to 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... Show Full Abstract
DOI: 10.1103/PhysRevLett.109.101802
Based on the full BaBar data sample, we report improved measurements of the ratios R(D(*)) = B(B to D(*) Tau Nu)/B(B to 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 to D Tau Nu, with a significance of 6.8 sigma. Show Partial Abstract Download File:
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