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A4 flavor symmetry model for Dirac neutrinos and sizable Ue3

MPS-Authors
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Memenga,  Nina
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Rodejohann,  Werner
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Zhang,  He
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Fulltext (public)

1301.2963
(Preprint), 1001KB

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Citation

Memenga, N., Rodejohann, W., & Zhang, H. (2013). A4 flavor symmetry model for Dirac neutrinos and sizable Ue3. Physical Review D, 87(5): 053021, pp. 1-7. doi:10.1103/PhysRevD.87.053021.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-F53E-E
Abstract
Models based on flavor symmetries are the most often studied approaches to explain the unexpected structure of lepton mixing. In many flavor symmetry groups a product of two triplet representations contains a symmetric and an anti-symmetric term. If this product of two triplets corresponds to a Majorana mass term, then the anti-symmetric part vanishes, and in economic models tri-bimaximal mixing is achieved. If neutrinos are Dirac particles, the anti-symmetric part is however present and leads to deviations from tri-bimaximal mixing, in particular non-zero U(e3). Thus, the non-vanishing value of U(e3) and the nature of the neutrino are connected. We illustrate this with a model based on A(4) within the framework of a neutrinophilic 2 Higgs doublet scenario.