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arXiv 2201.01960hep-phhep-ex
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具有准生中微子质量的Zee模型及在哪里找到它

Zee model with quasidegenerate neutrino masses and where to find it

R. Primulando, J. Julio, P. Uttayarat

摘要:

本文提出了一个辐射中微子质量具有家族依赖的$Z_2$对称性的Zee模型。我们的动机是得到一个模型,正确地描述中微子振荡现象,而在同一时间提供明确的预测。强加的$Z_2$对称性大大减少了模型中自由参数的数量。这些参数然后从中微子数据中确定,从中可以研究其结果。我们的设置只承认quasidegenerate中微子质量与中微子质量的总和在100和130 meV之间,有效的马约拉纳质量在20和40 meV之间,和有效的电子中微子质量在48和53 meV之间。发现Higgs二重态的真空期望值$\tbeta$之比为$\tbeta\lesssim 0.5$和$\tbeta\gtrsim 10$。前者被排除的轻子味违反(LFV)过程,如$μ\to eγ$和$μ\to e$转换,这是确定了两个循环。对于后者,这些LFV过程在下一代实验的范围内。此外,对于$\tbeta\gtrsim10$,重中性标量与双μ子的耦合是重要的。如果它们足够轻,即,$\lesssim200$ GeV,对撞机搜索他们的衰变到μ子对提供了一个更强的约束的模型参数空间的大多数部分比LFV的。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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