部分简并中微子质量对中微子混合矩阵微扰对sinθ {12}的影响
Effects on sinθ_{12} from perturbation of the neutrino mixing matrix with the partially degenerated neutrino masses
摘要：
我们考虑的情况下，领先的一级中微子质量矩阵是由一个理论的分析和再现的实验数据很好，但不完全。然后，下一阶段是通过添加小扰动项来尝试完全再现数据。本文给出了扰动质量矩阵对角化的解析方法，并找到了参数不改变\sin θ {12}的相容条件。这个条件可以引起参数调整，并在将增加的微扰项与分析预测联系起来方面起着至关重要的作用，特别是对于部分准简并中微子质量（m_2 \simeq m_1）的情况，在第二阶段实验中将观察到无中微子的双β衰变。
英文摘要：
We consider a situation where the leading-order neutrino mass matrix is derived by a theoretical ansatz and reproduces the experimental data well, but not completely. Then, the next stage is to try to fully reproduce the data by adding small perturbation terms. In this paper, we obtain the analytical method to diagonalize the perturbed mass matrix and find a consistency condition that parameters should satisfy not to change \sinθ_{12} much. This condition could cause parameter tuning and plays a crucial role in relating the added perturbation terms with the prediction analytically, in particular, for the case of the partially quasi-degenerated neutrino masses (m_2 \simeq m_1) where neutrinoless double beta decays would be observed in the phase-II experiments.
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