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arXiv 1303.0571hep-ex
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B -> D(*)Tau Nu衰变过量的测量及其对荷电希格斯玻色子玻色子的影响

Measurement of an Excess of B -> D(*) Tau Nu Decays and Implications for Charged Higgs Bosons

The BABAR Collaboration, J. P. Lees, others

摘要:

基于完整的BaBar数据样本,我们报告了比率R(D(*))= B(B -> D(*)Tau Nu)/B(B -> D(*)l Nu)的改进测量,其中l是e或mu。这些比率对带电希格斯玻色子形式的新物理贡献很敏感。我们测量R(D)= 0.440 +- 0.058 +- 0.042和R(D*)= 0.332 +- 0.024 +- 0.018,分别超出标准模型预期2.0 sigma和2.7 sigma。总之,我们的结果不同意这些期望在3.4西格玛水平。在II型双希格斯玻色子模型中,带电的希格斯玻色子不能解释这种过剩。这里提出的运动学分布排除了更一般的III型双希格斯偶模型的大部分,但在这个模型中有与结果兼容的解决方案。

英文摘要:

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. Kinematic distributions presented here exclude large portions of the more general type III two-Higgs-doublet model, but there are solutions within this model compatible with the results.

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