Electroweak baryogenesis in the three-loop neutrino mass model with dark matter
Electroweak baryogenesis in the three-loop neutrino mass model with dark matter
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DOI：
10.1103/physrevd.107.115022
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发表时间：
2022-12
影响因子：
5
通讯作者：
M. Aoki;Kazuki Enomoto;S. Kanemura
中科院分区：
文献类型：
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作者：
M. Aoki;Kazuki Enomoto;S. Kanemura
宇宙的重子不对称性是在最初在物理评论快报中提出的模型中进行评估的。102（2009）051805，其中中微子的马约拉纳质量是通过由额外的标量玻色子组成的三环图产生的，包括在未破缺的$Z_2$对称性下是奇数的暗物质候选者。为了使模型包括多个CP违反阶段，我们不强加软破$Z_2$对称性强加在原始模型中，以避免在树级的味道改变中性电流。相反，为了简单起见，我们假设汤川相互作用中的风味对齐结构。我们还简单地假设了Higgs势中的排列结构，使得Higgs耦合在树水平上与SM中的耦合一致。在这些唯象的简化下，模型仍然包含多个CP破坏相。通过利用它们之间的相消干涉，它与电偶极矩测量的严格约束相容，从而产生所观察到的重子不对称性沿着电弱重子生成的情景。我们给出了一个能同时解释宇宙中中微子质量、暗物质和重子不对称性的基准方案，该方案能满足所有其它现有的实验数据。一些唯象预测的模型进行了讨论。
Baryon asymmetry of the Universe is evaluated in the model originally proposed in Phys. Rev. Lett. 102 (2009) 051805, where Majorana masses of neutrinos are generated via three-loop diagrams composed of additional scalar bosons including the dark matter candidate which is odd under an unbroken $Z_2$ symmetry. In order for the model to include multiple CP-violating phases, we do not impose the softly broken $Z_2$ symmetry imposed in the original model to avoid the flavor-changing neutral current at tree level. Instead, for simplicity, we assume the flavor alignment structure in the Yukawa interactions. We also simply assume the alignment structure in the Higgs potential so that the Higgs couplings coincide with those in the SM at tree level. Under these phenomenological simplifications, the model still contains multiple CP-violating phases. By using destructive interferences among them, it is compatible with the stringent constraint from the electric dipole moment measurements to generate the observed baryon asymmetry along with the scenario of electroweak baryogenesis. We show a benchmark scenario which can explain neutrino mass, dark matter and baryon asymmetry of the universe simultaneously and can satisfy all the other available experimental data. Some phenomenological predictions of the model are also discussed.