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arXiv 1302.2171hep-exhep-ph
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在BABAR寻找新物理

Search For New Physics at BABAR

Romulus Godang

备注：
Contributed to the Proceedings of Hadron Collider Physics Symposium 2012, Kyoto, Japan, November 12-16 2012
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摘要：

使用一个完整的BABAR数据样本的426 $fb^{-1}$，我们提出了改进的测量比${\cal{R}}(D^{(*)}) = {\cal{B}} (\bar{B} \to D^{(*)}τ^{-}\barν_τ)/$ ${\cal{B}} (\bar{B} \to D^{(*)}\ell_{\ell}^{-}\barν_{\ell})$，其中$\ell$是电子或μ子。我们测量${\cal{R}}(D) = 0.440 \pm 0.058 \pm 0.042$和${\cal{R}}(D^*) = 0.332 \pm 0.024 \pm 0.018$。这些比值分别超过了$2.0σ$和$2.7σ$的标准模型预测值。结果与标准模型在$3.4σ$水平上的预测不一致。这个比值对带电希格斯玻色子形式的新物理贡献很敏感。然而，在II型双希格斯玻色子模型中，这种接触不能用带电的希格斯玻色子来解释。

英文摘要：

Using a full BABAR data sample of 426 $fb^{-1}$, we present improved measurements of the ratio ${\cal{R}}(D^{(*)}) = {\cal{B}} (\bar{B} \to D^{(*)}τ^{-}\barν_τ)/$ ${\cal{B}} (\bar{B} \to D^{(*)}\ell_{\ell}^{-}\barν_{\ell})$, where $\ell$ is either electron or muon. We measure ${\cal{R}}(D) = 0.440 \pm 0.058 \pm 0.042$ and ${\cal{R}}(D^*) = 0.332 \pm 0.024 \pm 0.018$. These ratios exceed the Standard Model predictions by $2.0σ$ and $2.7σ$, respectively. The results disagree with the Standard Model predictions at the level of $3.4σ$. The ratios are sensitive to new physics contributions in the form of a charged Higgs boson. However, the access cannot be explained by a charged Higgs boson in the type II two-Higgs-doublet model.

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