Golden Littlest Seesaw

Ding, Gui-Jun  (Interdisciplinary Center for Theoretical Study, Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China) ; King, Stephen F. (Physics and Astronomy, University of Southampton, Southampton, SO17 1BJ, UK) ; Li, Cai-Chang (Interdisciplinary Center for Theoretical Study, Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China)

30 October 2017

Abstract: We propose and analyse a new class of Littlest Seesaw models, with two right-handed neutrinos in their diagonal mass basis, based on preserving the first column of the Golden Ratio mixing matrix. We perform an exhaustive analysis of all possible remnant symmetries of the group A5 which can be used to enforce various vacuum alignments for the flavon controlling solar mixing, for two simple cases of the atmospheric flavon vacuum alignment. The solar and atmospheric flavon vacuum alignments are enforced by different remnant symmetries. We examine the phenomenological viability of each of the possible Littlest Seesaw alignments in A5 , which preserve the first column of the Golden ratio mixing matrix, using figures and extensive tables of benchmark points and comparing our predictions to a recent global analysis of neutrino data. A benchmark model is constructed based on A5×Z6×Z5×Z5′ .


Published in: Nuclear Physics B (2017)
Published by: Elsevier
DOI: 10.1016/j.nuclphysb.2017.10.019
License: CC-BY-3.0



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