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          Institute: MPI für Kernphysik     Collection: Theoretical Particle and Astro-Particle Physics     Display Documents

ID: 499104.0, MPI für Kernphysik / Theoretical Particle and Astro-Particle Physics
Deviations from tribimaximal mixing due to the vacuum expectation value misalignment in A4 models
Authors:Barry, James; Rodejohann, Werner
Date of Publication (YYYY-MM-DD):2010-06-17
Title of Journal:Physical Review D
Journal Abbrev.:Phys Rev D
Issue / Number:9
Start Page:1
End Page:14
Sequence Number of Article:093002
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The addition of an A_4 family symmetry and extended Higgs sector to the Standard Model can generate the tribimaximal mixing pattern for leptons, assuming the correct vacuum expectation value alignment of the Higgs scalars. Deviating this alignment affects the predictions for the neutrino oscillation and neutrino mass observables. An attempt is made to classify the plethora of models in the literature, with respect to the chosen A_4 particle assignments. Of these models, two particularly popular examples have been analyzed for deviations from tribimaximal mixing by perturbing the vacuum expectation value alignments. The effect of perturbations on the mixing angle observables is studied. However, it is only investigation of the mass-related observables (the effective mass for neutrinoless double beta decay and the sum of masses from cosmology) that can lead to the exclusion of particular models by constraints from future data, which indicates the importance of neutrino mass in disentangling models. The models have also been tested for fine-tuning of the parameters. Furthermore, a well-known seesaw model is generalized to include additional scalars, which transform as representations of A_4 not included in the original model.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Kernphysik/Independent Research Groups/Massive Neutrinos (Werner Rodejohann)
Identifiers:URL:http://arxiv.org/abs/1003.2385 [arxiv version]
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