存在 B→D*τ(-)ν(τ) 衰变的过剩证据。
Evidence for an excess of B→D*τ(-)ν(τ) decays.
机构信息
Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France.
出版信息
Phys Rev Lett. 2012 Sep 7;109(10):101802. doi: 10.1103/PhysRevLett.109.101802. Epub 2012 Sep 6.
Based on the full BABAR data sample, we report improved measurements of the ratios R(D())=B(B[over ¯]→D()τ(-)νover ¯)/B(B[over ¯]→D()ℓ(ℓ)(-)νover ¯), 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.
基于完整的 BABAR 数据样本，我们报告了对比值 R(D())=B(B[over ¯]→D()τ(-)νover ¯)/B(B[over ¯]→D()ℓ(ℓ)(-)νover ¯)的改进测量，其中 ℓ 是 e 或 μ。这些比值对以带电荷的 Higgs 玻色子形式存在的新物理贡献敏感。我们测量到 R(D)=0.440±0.058±0.042 和 R(D())=0.332±0.024±0.018，分别比标准模型预期高出 2.0σ 和 2.7σ。总的来说，我们的结果与这些预期在 3.4σ 水平上不一致。这种过剩不能用 II 型双 Higgs doublet 模型中的带电荷 Higgs 玻色子来解释。
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