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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1301.4037hep-ph
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以最小理论输入测试$B \to D τ\bar ν$衰减中的标准模型

Testing the Standard Model in $B \to D τ\bar ν$ decay with minimal theory input

Damir Becirevic, Nejc Kosnik, Andrey Tayduganov

摘要:

最近的实验结果的比率的分支分数的$\bar B \to D^{(*)}τν_τ$和$B\to D^{(*)} μν_μ$衰变来作为一个惊喜,并导致讨论的可能性,以约束新的物理通过这些模式。在这里,我们专注于$Br(B \to D τ\barν_τ)/Br(B \to D μ\barν_μ)$和认为,结果是一致的,与标准模型内$2\,σ$和测试的兼容性,这个比率与标准模型可以做实验与最小的理论输入。我们还表明,这两个衰变通道可以为我们提供相当好的约束的新的物理耦合。

英文摘要:

Recent experimental results for the ratio of the branching fractions of $\bar B \to D^{(*)}τν_τ$ and $B\to D^{(*)} μν_μ$ decays came as a surprise and lead to a discussion of possibility to constraining new physics through these modes. Here we focus on $Br(B \to D τ\barν_τ)/Br(B \to D μ\barν_μ)$ and argue that the result is consistent with the Standard Model within $2\,σ$ and that the test of compatibility of this ratio with the Standard Model can be done experimentally with a minimal theory input. We also show that these two decay channels can provide us with quite good constraints of the new physics couplings.

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