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arXiv 1905.03311hep-phhep-ex
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最大化新物理学对$b\rightarrow c τν$异常的影响

Maximizing the Impact of New Physics in $b\rightarrow c τν$ Anomalies

Pouya Asadi, David Shih

摘要:

我们开发了一个严格的,半解析的方法,最大限度地提高任何$b\to cτν$观察到的全20-实维参数空间的维度6有效的哈密顿量,给定一些固定值的$R_{D^{(*)}}$。我们应用我们的方法找到最大允许值的$F^L_{D^*}$和$R_{J/ψ}$,两个观测值都出来高于他们的SM预测在最近的测量由Belle和LHCb合作。虽然测量仍然有很大的误差线,但它们增加了现有的$R_{D^{(*)}}$异常,值得考虑NP解释。研究表明,文献中现有的极小模型均无法解释$F^L_{D^*}$和$R_{J/ψ}$的观测值。使用我们的方法,我们将推广到极小模型之外,并表明没有6维Wilson算子的组合可以在观测到的$R_{J/ψ}$值的$1σ$范围内。相比之下,我们将表明,观测值的$F^L_{D^*}$可以实现,但只有相当大的贡献,从张量和混合手征矢量威尔逊系数。

英文摘要:

We develop a rigorous, semi-analytical method for maximizing any $b\to cτν$ observable in the full 20-real-dimensional parameter space of the dimension 6 effective Hamiltonian, given some fixed values of $R_{D^{(*)}}$. We apply our method to find the maximum allowed values of $F^L_{D^*}$ and $R_{J/ψ}$, two observables which have both come out higher than their SM predictions in recent measurements by the Belle and LHCb collaborations. While the measurements still have large error bars, they add to the existing $R_{D^{(*)}}$ anomaly, and it is worthwhile to consider NP explanations. It has been shown that none of the existing, minimal models in the literature can explain the observed values of $F^L_{D^*}$ and $R_{J/ψ}$. Using our method, we will generalize beyond the minimal models and show that there is no combination of dimension 6 Wilson operators that can come within $1σ$ of the observed $R_{J/ψ}$ value. By contrast, we will show that the observed value of $F^L_{D^*}$ can be achieved, but only with sizable contributions from tensor and mixed-chirality vector Wilson coefficients.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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