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arXiv 1810.09413hep-ph
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电子电偶极矩的双圈水平EFT方法

EFT approach to the electron Electric Dipole Moment at the two-loop level

Giuliano Panico, Alex Pomarol, Marc Riembau

摘要:

ACME协作组最近报告了电子电偶极矩(EDM)的新界限,$|d_e|< 1.1 \times 10^{-29}\, {\rm e\cdot cm}$在90 $\%$置信水平下,达到了前所未有的精度水平。这可以转化为新的相关限制的理论超越SM奠定在TeV规模,即使当他们有助于电子EDM在两个回路的水平。我们使用EFT的方法来分类这些修正,提出的贡献的CP违反偶极运营商的电子到两个循环的水平的异常尺寸。基于螺旋度和CP的选择规则在简化该分析方面起着重要作用。我们使用这个结果提供新的边界BSM与leptoquarks,额外的希格斯粒子,或限制在MSSM和复合希格斯模型的部门。新的ACME界限将自然理论大大推向微调领域,除非它们有办法意外地保持CP。

英文摘要:

The ACME collaboration has recently reported a new bound on the electric dipole moment (EDM) of the electron, $|d_e|< 1.1 \times 10^{-29}\, {\rm e\cdot cm}$ at 90$\%$ confidence level, reaching an unprecedented accuracy level. This can translate into new relevant constraints on theories beyond the SM laying at the TeV scale, even when they contribute to the electron EDM at the two-loop level. We use the EFT approach to classify these corrections, presenting the contributions to the anomalous dimension of the CP-violating dipole operators of the electron up to the two-loop level. Selection rules based on helicity and CP play an important role to simplify this analysis. We use this result to provide new bounds on BSM with leptoquarks, extra Higgs, or constraints in sectors of the MSSM and composite Higgs models. The new ACME bound pushes natural theories significantly more into fine-tune territory, unless they have a way to accidentally preserve CP.

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