Cancellation mechanism in the predictions of electric dipole moments
Cancellation mechanism in the predictions of electric dipole moments
复制标题
电偶极矩预测中的抵消机制
DOI：
10.1103/physrevd.95.115029
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发表时间：
2017
影响因子：
5
通讯作者：
Chen Ning
中科院分区：
文献类型：
--
作者：
Bian Ligong;Chen Ning
对宇宙重子不对称性的解释需要超出标准模型 (SM) 的 CP 破坏。我们在电子电偶极矩（EDM）、夸克色电偶极矩和温伯格算子的理论预测中提出了一种通用的抵消机制。 ACME 合作组织于 2013 年发布的当前电子 EDM 约束以及最近的 $^{199}$Hg EDM 实验允许希格斯扇区出现相对较大的 CP 破坏。抵消机制可以由重希格斯玻色子在 $\sim\mathcal{O}(0.1-1)$ GeV 周围的质量分裂引起，质量简并的程度决定了 CP 破坏相的大小。我们通过研究 CP 破坏双希格斯模型和最小超对称标准模型来阐明这一点。当新物理模型的希格斯扇区存在CP破坏和混合时，抵消机制是通用的。这种情况下的 CP 破坏相可以通过预计的 $^{225}$Ra EDM 实验以及未来的对撞机排除或检测，精度达到 $\sim10^{-28}\,e\cdot{\rm cm}$。
The interpretation of the baryon asymmetry of the Universe necessitates the CP violation beyond the Standard Model (SM). We present a general cancellation mechanism in the theoretical predictions of the electron electric dipole moments (EDM), quark chromo-EDMs, and Weinberg operators. A relative large CP violation in the Higgs sector is allowed by the current electron EDM constraint released by the ACME collaboration in 2013, and the recent $^{199}$Hg EDM experiment. The cancellation mechanism can be induced by the mass splitting of heavy Higgs bosons around $\sim\mathcal{O}(0.1-1)$ GeV, and the extent of the mass degeneracy determines the magnitude of the CP-violating phase. We explicate this point by investigating the CP-violating two-Higgs-doublet model and the minimal supersymmetric Standard Model. The cancellation mechanism is general when there are CP violation and mixing in the Higgs sector of new physics models. The CP-violating phases in this scenario can be excluded or detected by the projected $^{225}$Ra EDM experiments with precision reaching $\sim10^{-28}\,e\cdot{\rm cm}$, as well as the future colliders.