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arXiv 1010.3065hep-ph
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一类A_4味模型中三双峰中微子混合的内禀偏差

Intrinsic Deviation from the Tri-bimaximal Neutrino Mixing in a Class of A_4 Flavor Models

Takeshi Araki, Jianwei Mei, Zhi-zhong Xing

摘要:

众所周知,三双峰中微子混合模式V_0可以从一类具有非阿贝尔A_4对称性的味模型中导出。我们指出,对V_0的小修正是A_4模型固有的,并且来自带电轻子和中微子扇区,但在以前的工作中被省略了。结果表明,这种修正可能导致3 \times 3中微子混合矩阵V偏离V0,但不会导致θ 13的非零值或新的CP破坏相.目前的实验条件对V的么正性的限制,使我们能够在一定程度上限制模型参数。

英文摘要:

It is well known that the tri-bimaximal neutrino mixing pattern V_0 can be derived from a class of flavor models with the non-Abelian A_4 symmetry. We point out that small corrections to V_0, which are inherent in the A_4 models and arise from both the charged-lepton and neutrino sectors, have been omitted in the previous works. We show that such corrections may lead the 3 \times 3 neutrino mixing matrix V to a non-unitary deviation from V_0, but they cannot result in a nonzero value of θ_13 or any new CP-violating phases. Current experimental constraints on the unitarity of V allow us to constrain the model parameters to some extent.

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