Abstract
Assuming three generations of Majorana neutrinos, we study the different mixing patterns that arise from the non-trivial breaking of the flavor group A5 and CP to the residual symmetries Z3, Z5 or Z2 × Z2 in the charged lepton and to Z2 × CP in the neutrino sector. All patterns contain only one free parameter θ and thus mixing angles as well as the Dirac and the two Majorana phases are strongly correlated. We perform an analytical and a numerical study of all possible mixing patterns. It turns out that only four patterns can describe the experimentally measured values of the mixing angles for a particular choice of θ well. All of them predict trivial Majorana phases, while the Dirac phase δ is maximal for two patterns and trivial for the two remaining ones. If δ is maximal, also the atmospheric mixing angle is fixed to be maximal.
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Di Iura, A., Hagedorn, C. & Meloni, D. Lepton mixing from the interplay of the alternating group A5 and CP. J. High Energ. Phys. 2015, 37 (2015). https://doi.org/10.1007/JHEP08(2015)037
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DOI: https://doi.org/10.1007/JHEP08(2015)037