近日，智利亚原子物理研究所的Téssio B. de Melo及其研究团队取得一项新进展。经过不懈努力，他们提出了三环逆scotogenic跷跷板模型。相关研究成果已于2024年5月3日在国际知名学术期刊《高能物理杂志》上发表。
该研究团队提出了一个创新模型，它能够揭示轻中微子质量的来源，解释宇宙中重子数量的不对称性，并提供了潜在的暗物质候选者。在这些模型中，活动中微子的马约拉纳质量是通过反跷跷板机制产生的，同时三个环上的过程导致了违反右手马约拉纳中微子质量μ的轻子数产生。这种过程是由模型中的离散对称性保护的，确保了候选暗物质的稳定性。
研究人员特别关注其中一个模型，并对其轻子区的现象学进行了详尽的分析。该模型在弱洗脱和强冲刷条件下都能成功模拟重子产生过程。当马约拉纳子矩阵μ的分量处于keV到MeV的范围内时，最轻的重费米子成为了一个可行的暗物质候选者。这些模型解与现有的实验约束条件相符，能够很好地适应活性中微子的质量顺序，特别是电荷-轻子味违反衰变μ→γ、μ→eee等过程，并且在未来的实验中，电子-介子转换过程预计将达到相当高的探测灵敏度。
附：英文原文
Title: Three-loop inverse scotogenic seesaw models
Author: Abada, Asmaa, Bernal, Nicolas, Crcamo Hernndez, A. E., Kovalenko, Sergey, de Melo, Tessio B.
Issue&Volume: 2024-05-03
Abstract: We propose a class of models providing an explanation of the origin of light neutrino masses, the baryon asymmetry of the Universe via leptogenesis and offering viable dark matter candidates. In these models the Majorana masses of the active neutrino are generated by the inverse seesaw mechanism with the lepton number violating right-handed Majorana neutrino masses μ arising at three loops. The latter is ensured by the preserved discrete symmetries, which also guarantee the stability of the dark matter candidate. We focus on one of these models and perform a detailed analysis of the phenomenology of its leptonic sector. The model can successfully accommodate baryogenesis through leptogenesis in both weak and strong washout regimes. The lightest heavy fermion turns out to be a viable dark matter candidate, provided that the entries of the Majorana submatrix μ are in the keV to MeV range. The solutions are consistent with the experimental constraints, accommodating both mass orderings for active neutrinos, in particular charged-lepton flavor violating decays μ → eγ, μ → eee, and the electron-muon conversion processes get sizable rates within future sensitivity reach.
DOI: 10.1007/JHEP05(2024)035
Source: https://link.springer.com/article/10.1007/JHEP05(2024)035