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Journal Article

"Hidden" O(2) and SO(2) Symmetry in Lepton Mixing

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons37613

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

http://pubman.mpdl.mpg.de/cone/persons/resource/persons30951

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

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Fulltext (public)

1112.3628
(Preprint), 2MB

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There is no public supplementary material available
Citation

Heeck, J., & Rodejohann, W. (2012). "Hidden" O(2) and SO(2) Symmetry in Lepton Mixing. Journal of High Energy Physics, 1202(2): 094. doi:10.1007/JHEP02(2012)094.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-4B3E-8
Abstract
To generate the minimal neutrino Majorana mass matrix that has a free solar mixing angle and Delta m_sol^2 = 0 it suffices to implement an O(2) symmetry, or one of its subgroups SO(2), Z_N (N>2), or D_N (N>2). This O(2) generalizes the hidden Z_2^s of lepton mixing and leads in addition automatically to mu-tau symmetry. Flavor-democratic perturbations, as expected e.g. from the Planck scale, then result in tri-bimaximal mixing. We present a minimal model with three Higgs doublets implementing a type-I seesaw mechanism with a spontaneous breakdown of the symmetry, leading to large theta_13 and small Delta m_sol^2 = 0 due to the particular decomposition of the perturbations under mu-tau symmetry.