论文标题
Zee模型具有准代的中微子质量和在哪里可以找到它
Zee model with quasidegenerate neutrino masses and where to find it
论文作者
论文摘要
我们提出了一个Zee模型，具有依赖家庭的$ Z_2 $对称性，用于辐射性中微子质量。我们的动机是获得正确描述中微子振荡现象的模型，同时提供了明确的预测。施加的$ Z_2 $对称性大大减少了模型中的免费参数数量。然后从中微子数据中确定这些参数，从中可以研究其结果。我们的设置仅接受中微子质量100至130 MeV，有效的Majorana质量在20至40 MeV之间以及有效的电子中微子质量之间的中微子质量和48至53 MeV之间的有效主要电子中微子质量。发现Higgs Doublets的真空期望值（$ \ tbeta $）的比率为$ \ tbeta \ lisesim 0.5 $和$ \ tbeta \ tbeta \ gtrsim 10 $。前者被Lepton风味违规（LFV）过程所排除，例如$μ\至Eγ$和$μ\ to e $ conversion，最多确定了两个循环。对于后者，这些LFV过程在下一代实验的范围内。此外，对于$ \ tbeta \ gtrsim10 $，重型中性标量与迪都沟的耦合很重要。如果它们足够轻，即$ \ lyssim200 $ GEV，对撞机搜索的衰减中的衰减对模型参数空间的大多数部分比LFV提供了更强的限制。
We present a Zee model with a family dependent $Z_2$ symmetry for radiative neutrino masses. Our motivation is to get a model that correctly describes neutrino oscillation phenomena, while at the same time offers definite predictions. The imposed $Z_2$ symmetry greatly reduces the number of free parameters in the model. These parameters are then determined from the neutrino data, from which one can study its outcomes. Our setup only admits quasidegenerate neutrino masses with the sum of neutrino masses between 100 and 130 meV, the effective Majorana mass between 20 and 40 meV, and the effective electron neutrino mass between 48 and 53 meV. The ratio of the vacuum expectation values of the Higgs doublets, $\tbeta$, is found to be $\tbeta\lesssim 0.5$ and $\tbeta\gtrsim 10$. The former is ruled out by lepton flavor violation (LFV) processes, such as $μ\to eγ$ and $μ\to e$ conversion, which are determined up to two loops. For the latter, these LFV processes are within reach of the next generation of experiments. Moreover, for $\tbeta\gtrsim10$, the couplings of heavy neutral scalars to dimuon are significant. If they are sufficiently light, i.e., $\lesssim200$ GeV, collider search for their decays into muon pair provides a stronger constraint on most parts of the model parameter space than the LFV ones.
