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arXiv 1406.0083hep-ph
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电子EDM作为PeV标度物理的灵敏探针

Electron EDM as a Sensitive Probe of PeV Scale Physics

Tarek Ibrahim, Ahmad Itani, Pran Nath

摘要:

作为高尺度物理的一种探索,我们给出了电偶极矩的定量分析。我们专注于电子的电偶极矩,因为它的限制是最严格的。此外,它的理论计算是免费的QCD的不确定性。这里提出的分析首先探讨了探测高尺度通过电子EDM内MSSM的贡献电偶极矩(EDM)产生的电荷伴子和中性伴子交换环。这里,它表明,电子EDM可以探测从几十TeV到PeV的范围内的质量scales.The分析,然后扩展到包括一个矢量的一代,可以与三个普通的代混合。在这里,新的CP阶段出现,它表明,电子EDM现在不仅有超对称的贡献,从交换charginos和neutralinos,但也有一个非超对称的贡献,从交换的W和Z玻色子。进一步表明,超对称和非超对称贡献的干涉导致了电子EDM随slepton质量的变化先下降,然后变小,然后随slepton质量的增加而上升的显著现象。在低尺度下,超对称贡献消失,而在高尺度下,非超对称贡献单独控制EDM。EDM可以探测的高质量尺度远远超过加速器能够探测的范围。还讨论了超对称和非超对称扇区中EDM对CP相位的敏感性。

英文摘要:

We give a quantitative analysis of the electric dipole moments as a probe of high scale physics. We focus on the electric dipole moment of the electron since the limit on it is the most stringent. Further, theoretical computations of it are free of QCD uncertainties. The analysis presented here first explores the probe of high scales via electron EDM within MSSM where the contributions to the electric dipole moment (EDM) arise from the chargino and the neutralino exchanges in loops. Here it is shown that the electron EDM can probe mass scales from tens of TeV into the PeV range.The analysis is then extended to include a vectorlike generation which can mix with the three ordinary generations. Here new CP phases arise and it is shown that the electron EDM now has not only a supersymmetric contribution from the exchange of charginos and neutralinos but also a non-supersymmetric contribution from the exchange of W and Z bosons. It is further shown that the interference of the supersymmetric and the non-supersymmetric contribution leads to the remarkable phenomenon where the electron EDM as a function of the slepton mass first falls and become vanishingly small and then rises again as the slepton mass increases This phenomenon arises as a consequence of cancellation between the SUSY and the non-SUSY contribution at low scales while at high scales the SUSY contribution dies out and the EDM is controlled by the non-SUSY contribution alone. The high mass scales that can be probed by the EDM are far in excess of what accelerators will be able to probe. The sensitivity of the EDM to CP phases both in the SUSY and the non-SUSY sectors are also discussed.

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