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arXiv 0909.1463hep-ph
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弗里德伯格-李对称性与最小跷跷板模型

The Friedberg-Lee Symmetry and Minimal Seesaw Model

Xiao-Gang He, Wei Liao

摘要:

Friedberg-Lee(FL)对称性是由费米场$q$到$q + ξz$的变换产生的。这种对称性对拉格朗日量中的允许项提出了非常严格的约束。将这种对称性应用于$N$费米子场,我们发现,如果场具有规范相互作用或变换是局域的,则独立场的数目减少到$N-1$。利用这一性质,我们发现,原来的跷跷板模型与三代左右手中微子,左手中微子不受影响,但右手中微子下的本地FL翻译转换,是减少到一个有效的理论最小的跷跷板只有两个右手中微子。对称性预言其中一个轻中微子的质量必须为零。

英文摘要:

The Friedberg-Lee (FL) symmetry is generated by a transformation of a fermionic field $q$ to $q + ξz$. This symmetry puts very restrictive constraints on allowed terms in a Lagrangian. Applying this symmetry to $N$ fermionic fields, we find that the number of independent fields is reduced to $N-1$ if the fields have gauge interaction or the transformation is a local one. Using this property, we find that a seesaw model originally with three generations of left- and right-handed neutrinos, with the left-handed neutrinos unaffected but the right-handed neutrinos transformed under the local FL translation, is reduced to an effective theory of minimal seesaw which has only two right-handed neutrinos. The symmetry predicts that one of the light neutrino masses must be zero.

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