Barrie Neil D, Han Chengcheng, Murayama Hitoshi
Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS), Daejeon 34126, Korea.
School of Physics, Sun Yat-Sen University, Guangzhou 510275, China.
Phys Rev Lett. 2022 Apr 8;128(14):141801. doi: 10.1103/PhysRevLett.128.141801.
We find that the triplet Higgs of the type-II seesaw mechanism can simultaneously generate the neutrino masses and observed baryon asymmetry while playing a role in inflation. We survey the allowed parameter space and determine that this is possible for triplet masses as low as a TeV, with a preference for a small vacuum expectation value for the triplet v_{Δ}<10 keV. This requires that the triplet Higgs must decay dominantly into the leptonic channel. Additionally, this model will be probed at the future 100 TeV collider, upcoming lepton flavor violation experiments such as Mu3e, and neutrinoless double beta decay experiments. Thus, this simple framework provides a unified solution to the three major unknowns of modern physics-inflation, the neutrino masses, and the observed baryon asymmetry-while simultaneously providing unique phenomenological predictions that will be probed terrestrially at upcoming experiments.
我们发现，II型跷跷板机制中的三重态希格斯玻色子可以在暴胀过程中发挥作用的同时，产生中微子质量并解释观测到的重子不对称性。我们研究了允许的参数空间，并确定对于低至1 TeV的三重态质量，这是可能的，并且倾向于三重态的小真空期望值v_{Δ}<10 keV。这要求三重态希格斯玻色子必须主要衰变为轻子通道。此外，该模型将在未来的100 TeV对撞机、即将进行的轻子味违反实验（如Mu3e）以及无中微子双β衰变实验中得到检验。因此，这个简单的框架为现代物理学的三个主要未知问题——暴胀、中微子质量和观测到的重子不对称性——提供了一个统一的解决方案，同时提供了独特的唯象学预测，这些预测将在即将进行的实验中在地球上得到检验。
