中微子振荡中的μ-τ和CP破缺共同起源

Common origin of the μ-τ and CP breaking in the neutrino oscillation

由中微子的实验数据支持的近似味对称性μ-τ出发,对最小seesaw机制中的中微子性质进行了研究.在中微子质量产生seesaw机制中,μ-τ和CP这两个分离对称性为拉氏量的基本对称性,它们的破缺共同起源于同一个软破缺项,由这个简单的破缺方式,得到软μ-τ破缺在低能时导致了两个小的偏差量δa(≡θa-π/4),δx(≡θx-0)之间的关联,给出θ13混合角的理论取值范围.

All neutrino oscillation data strongly support μ-τ symmetry as a good approximate flavor symmetry of the neutrino sector, exhibited in any viable model building for neutrino mass generation. Both discrete μ-τ and CP symmetries are fundamental symmetries of the minimal seesaw Lagrangian, and they are only softly broken, arising from a common origin. From this conceptually attractive and simple construction from a common origin, the soft μ-τ breaking at low energies, leading to quantitative of the two soft breakings correlations between the apparently two small deviations δa ≡ θa -π/4, and δx ≡ θx - 0 is predicted, and then the value range of mixing angle θ13 is given.