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High Energy Physics - Phenomenology, hep-ph,High Energy Physics - Experiment, hep-ex
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.
