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arXiv 0909.3116hep-ph
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最大混合作为小混合的“总和”

Maximal mixing as a `sum' of small mixings

Joydeep Chakrabortty, Anjan S. Joshipura, Poonam Mehta, Sudhir K. Vempati

摘要:

在模型中有两个来源的中微子质量,我们看看在总质量矩阵中产生最大/大的混合角的可能性,其中两个源只有小的混合角。我们表明,在两代的情况下,最大的混合可以自然地出现时,总中微子质量矩阵有一个准简并模式。证明这一点的最好方法是将准简并谱分解为层次和逆层次质量矩阵,两者都具有小的混合。这种准简并谱的分解实际上是非常普遍的,并且可以与质量矩阵中存在的混合无关地进行。通过三代和两个源,我们证明了总中微子质量矩阵中只有一个或全部三个小混合角可以转化为最大/大混合角。在这种情况下,退化模式的分解最好实现为子矩阵,子矩阵的主特征值具有交替模式。另一方面,如果一个或两个子矩阵包含最大混合,则可以生成两个大混合角和一个小混合角。我们目前的例子纹理。对于三个中微子质量源,只要所有子矩阵的贡献相等,结果几乎保持不变。左-右对称模型,其中I型和II型跷跷板机制相关提供了一个框架,小的混合可以转换为大的混合角,简并中微子。

英文摘要:

In models with two sources of neutrino masses, we look at the possibility of generating maximal/large mixing angles in the total mass matrix, where both the sources have only small mixing angles. We show that in the two generation case, maximal mixing can naturally arise only when the total neutrino mass matrix has a quasi-degenerate pattern. The best way to demonstrate this is by decomposing the quasi-degenerate spectrum in to hierarchial and inverse-hierarchial mass matrices, both with small mixing. Such a decomposition of the quasi-degenerate spectra is in fact very general and can be done irrespective of the mixing present in the mass matrices. With three generations, and two sources, we show that only one or all the three small mixing angles in the total neutrino mass matrix can be converted to maximal/large mixing angles. The decomposition of the degenerate pattern in this case is best realised in to sub-matrices whose dominant eigenvalues have an alternating pattern. On the other hand, it is possible to generate two large and one small mixing angle if either one or both of the sub-matrices contain maximal mixing. We present example textures of this. With three sources of neutrino masses, the results remain almost the same as long as all the sub-matrices contribute equally. The Left-Right Symmetric model where Type I and Type II seesaw mechanisms are related provides a framework where small mixings can be converted to large mixing angles, for degenerate neutrinos.

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