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Low-scale minimal linear seesaw model for neutrino mass and flavor mixing
Modern Physics Letters A ( IF 1.4 ) Pub Date : 2021-07-19 , DOI: 10.1142/s0217732321501595
Ernesto A. Matute 1
Affiliation  

We consider an extension of the Standard Model with three right-handed (RH) neutrinos and a Dirac pair of extra sterile neutrinos, odd under a discrete Z2 symmetry, in order to have left–right symmetry in the neutrino content and obtain tiny neutrino masses from the latter ones only. Our working hypothesis is that the heavy RH neutrinos do not influence phenomenology at low energies. We use the usual high-scale seesaw to suppress all of the mass terms involving RH neutrinos and a low-scale minimal variant of the linear seesaw led by the Dirac mass of the extra sterile neutrinos to provide the small mass of active neutrinos. One of the active neutrinos is massless, which fixes the mass of the other two on the basis of a soft breaking of the Z2 symmetry. The mixing between the extra neutrinos makes for a particle that effectively behaves like a Dirac sterile neutrino with mass around the GeV level.

中文翻译:

中微子质量和风味混合的低尺度最小线性跷跷板模型

我们考虑标准模型的扩展,其中包含三个右手(RH)中微子和一对狄拉克额外无菌中微子,在离散的Z2对称性,以使中微子含量具有左右对称性,并仅从后者中获得微小的中微子质量。我们的工作假设是重 RH 中微子在低能下不会影响现象学。我们使用通常的高尺度跷跷板来抑制所有涉及 RH 中微子的质量项,并使用由额外无菌中微子的狄拉克质量领导的线性跷跷板的低尺度最小变体来提供小质量的活性中微子。一个活跃的中微子是无质量的,它在软中断的基础上固定了另外两个的质量Z2对称。额外的中微子之间的混合使得粒子的行为有效地类似于质量在 GeV 水平附近的狄拉克无菌中微子。
更新日期:2021-07-19
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