Intrinsic Deviation from the Tri-bimaximal Neutrino Mixing in a Class of A 4 
Flavor Models

Araki, Takeshi; Mei, Jianwei; Xing, Zhi-zhong

doi:10.1016/j.physletb.2010.10.061

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Intrinsic Deviation from the Tri-bimaximal Neutrino Mixing in a Class of A 4 Flavor Models

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Mei, Jianwei
Quantum Gravity & Unified Theories, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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1010.3065
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Citation

Araki, T., Mei, J., & Xing, Z.-z. (2011). Intrinsic Deviation from the Tri-bimaximal Neutrino Mixing in a Class of A 4 Flavor Models. Physics Letters B, 695(1-4), 165-168. doi:10.1016/j.physletb.2010.10.061.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-109A-6

Abstract

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 \theta_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.