Based on the full BABAR data sample, we report improved measurements of the ratios R(D(*))=B(B̄→D(*)τ-ν̄τ)/B(B̄→D(*)ℓℓ-ν̄ℓ), where ℓ is either e or μ. 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 2.0σ and 2.7σ, respectively. Taken together, our results disagree with these expectations at the 3.4σ level. This excess cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model.
Physical Review Letters
- Pub Date:
- September 2012
- Decays of bottom mesons;
- Bottom mesons;
- High Energy Physics - Experiment
- Expanded section on systematics, text corrections, improved the format of Figure 2 and included the effect of the change of the Tau polarization due to the charged Higgs