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arXiv 2403.13613hep-ph
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中微子质量、暗物质与宇宙重子不对称性模型中的电偶极矩

The electric dipole moment in a model for neutrino mass, dark matter and baryon asymmetry of the Universe

Kazuki Enomoto, Shinya Kanemura, Sora Taniguchi

AI总结:

本文研究了三圈中微子质量模型中的电偶极矩,提出通过Higgs扇区与暗扇区CP破坏相的破坏性干涉抑制eEDM,在满足实验限制下同时解释中微子质量、暗物质与宇宙重子不对称性。

摘要:

本文在最初由Aoki等人[Phys. Rev. Lett. 102, 051805 (2009)]提出的三圈中微子质量模型中,研究了包含暗物质的电偶极矩。该模型在Higgs势中包含一个$CP$破坏相,它在电弱重子生成中起重要作用,因此有望同时解释宇宙的重子不对称性。然而,这样的$CP$破坏相受到电子电偶极矩(eEDM)测量的严格限制,需要一种抑制eEDM的机制来在避免限制的同时解释观测到的重子不对称性。在本文中,我们研究了该模型中的中微子质量、轻子味破坏过程、暗物质和eEDM。我们表明,eEDM可以通过Higgs扇区中的$CP$破坏相与具有大$CP$破坏相的暗扇区之间的破坏性干涉来抑制。我们提出了一些基准场景,包括$O(1)$的$CP$破坏相,其中可以解释微小的中微子质量和暗物质,同时避免所有当前的实验和理论限制。这些$CP$破坏相预计足够大,能够在电弱重子生成场景中产生观测到的重子不对称性。

英文摘要:

The electric dipole moment is examined in a three-loop neutrino mass model with dark matter originally proposed in Aoki et al. [Phys. Rev. Lett. 102, 051805 (2009)]. The model contains a $CP$-violating phase in the Higgs potential which plays an important role in electroweak baryogenesis and is thus expected to explain the baryon asymmetry of the Universe simultaneously. However, such a $CP$-violating phase is severely constrained by the measurements of the electron electric dipole moment (eEDM), and a suppression mechanism for the eEDM is necessary to explain the observed baryon asymmetry while avoiding the constraint. In this paper, we examine neutrino mass, lepton-flavor-violating processes, dark matter, and the eEDM in the model. We show that the eEDM can be suppressed by destructive interference between the $CP$-violating phases in the Higgs sector and the dark sector with large $CP$-violating phases. We propose some benchmark scenarios including $O(1)$ $CP$-violating phases where tiny neutrino mass and dark matter can be explained while avoiding all current experimental and theoretical constraints. These $CP$-violating phases are expected to be large enough to generate the observed baryon asymmetry in the electroweak baryogenesis scenario.

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