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arXiv 1106.4359hep-phhep-ex
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三-双极大混合的极小修正

Minimal Modification to Tri-bimaximal Mixing

Xiao-Gang He, A. Zee

摘要:

我们探索了一些最小限度地修改中微子混合矩阵的方法,其特征在于引入最多一个混合角和CP破坏相,从而扩展了我们以前的工作。一个最小的修改,在一定程度上由群论的考虑,是一个简单的情况下,在混合矩阵中的第二列的元素$V_{α2}$等于$1/\sqrt{3}$。通过保持其中一列或其中一行不变的修改都属于最小修改类。其中一些案例具有有趣的实验可检验的结果。特别是,T2 K和MINOS合作最近报告了非零$θ_{13}$的迹象。对于我们考虑的情况,新的数据明显地限制了CP违反相位角$δ$,其中$δ$接近于0(在某些情况下)并且$π$不受欢迎。

英文摘要:

We explore some ways of minimally modifying the neutrino mixing matrix from tribimaximal, characterized by introducing at most one mixing angle and a CP violating phase thus extending our earlier work. One minimal modification, motivated to some extent by group theoretic considerations, is a simple case with the elements $V_{α2}$ of the second column in the mixing matrix equal to $1/\sqrt{3}$. Modifications by keeping one of the columns or one of the rows unchanged from tri-bimaximal mixing all belong to the class of minimal modification. Some of the cases have interesting experimentally testable consequences. In particular, the T2K and MINOS collaborations have recently reported indications of a non-zero $θ_{13}$. For the cases we consider, the new data sharply constrain the CP violating phase angle $δ$, with $δ$ close to 0 (in some cases) and $π$ disfavored.

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