惰性中微子暗物质呼唤GeV重中性轻子
Sterile Neutrino Dark Matter Cries for GeV Heavy Neutral Leptons
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中文总结 AI 辅助
该研究通过首次完整参数扫描中微子最小标准模型，发现重中性轻子可在受限参数空间内统一解释中微子质量、重子不对称和暗物质，且质量可被SHiP、LHC等实验探测。
中文摘要 AI 辅助
在标准模型通过三个右手中微子进行最小扩展的框架下，宇宙中的普通物质和暗物质可能具有共同起源。一对这样的重中性轻子（HNLs）可以赋予中微子质量，在电弱尺度产生重子不对称性，并在QCD尺度产生大的轻子不对称性，该不对称性随后通过共振转化为第三种态的数量，该态充当惰性中微子暗物质。这一设置的最小性，即所谓的中微子最小标准模型（$ν$MSM），使其具有高度可预测性。早期基于同时解释中微子质量以及重子和暗物质丰度的要求来确定HNLs性质的尝试，因对描述HNLs在整个宇宙历史中演化的量子动力学方程理解不完整而受阻。我们进行了首次克服这一缺点的$ν$MSM参数扫描。我们发现，$ν$MSM仅在一个在所有方向上均受限的明确定义参数空间内为上述所有现象提供统一解释，其中HNL质量在SHiP实验以及LHC和未来轻子对撞机搜索的运动学可达范围内。对HNL衰变分支比、CP破坏和轻子数破坏（LNV）的进一步预测使该模型具有高度可测试性，使发现中微子质量和宇宙中所有物质的共同起源在现有和计划中的实验范围内成为可能。
英文摘要
The ordinary and dark matter in the Universe may share a common origin in the framework of a minimal extension of the Standard Model by three right-handed neutrinos. A pair of such heavy neutral leptons (HNLs) can give masses to neutrinos, generate the baryon asymmetry at the electroweak scale and produce a large lepton asymmetry at the QCD scale, which is then resonantly transformed into an abundance of the third state that acts as sterile neutrino dark matter. The minimality of this setup, known as Neutrino Minimal Standard Model ($ν$MSM), makes it highly predictive. Earlier attempts to pin down the properties of the HNLs based on the requirement to simultaneously explain the neutrino masses as well as the baryonic and dark matter abundances were hampered by an incomplete understanding of the quantum kinetic equations describing the HNLs throughout cosmic history. We perform the first parameter scan of the $ν$MSM in which this shortcoming has been overcome. We find that the $ν$MSM provides a common explanation for all aforementioned phenomena only within a well-defined parameter space that is limited in all directions, with HNL masses kinematically accessible by the SHiP experiment as well as searches at the LHC and future lepton colliders. Further predictions for the HNL decay branching ratios, CP-violation, and lepton number violation (LNV) make the model highly testable, bringing a discovery of the common origin of neutrino masses and all matter in the Universe within reach of existing and planned experiments.
发表机构
- Université catholique de Louvain（天主教鲁汶大学）
- Technische Universität München（慕尼黑工业大学）
- University of Tokyo（东京大学）
- University of Zagreb（萨格勒布大学）
- École Polytechnique Fédérale de Lausanne (EPFL)（洛桑联邦理工学院）
- University of Copenhagen（哥本哈根大学）
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