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arXiv 1208.4558hep-ph
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轻子味破坏和跷跷板对称性

Lepton flavor violation and seesaw symmetries

D. Aristizabal Sierra

摘要:

当标准模型推广到右手中微子时,所得到的拉格朗日量的对称性被一个新的整体U(1)R阿贝尔因子所扩大.在最小跷跷板模型的背景下,我们分析了轻微破缺的U(1)R对称性对带电轻子味违反衰变的影响。我们发现,根据R-电荷分配,模型带电轻子味违反率可以在可测量的范围内。特别是,我们表明,在由此产生的模型中,由于轻中微子质量矩阵的结构μ介子味道违反衰变完全由中微子数据(归一化因子),并可以在很宽的右手中微子质量范围内是相当大的。

英文摘要:

When the standard model is extended with right-handed neutrinos the symmetries of the resulting Lagrangian are enlarged with a new global U(1)R Abelian factor. In the context of minimal seesaw models we analyze the implications of a slightly broken U(1)R symmetry on charged lepton flavor violating decays. We find, depending on the R-charge assignments, models where charged lepton flavor violating rates can be within measurable ranges. In particular, we show that in the resulting models due to the structure of the light neutrino mass matrix muon flavor violating decays are entirely determined by neutrino data (up to a normalization factor) and can be sizable in a wide right-handed neutrino mass range.

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