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Light sterile neutrinos: models and phenomenology

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Abstract

Motivated by recent hints in particle physics and cosmology, we study the realization of eV-scale sterile neutrinos within both the seesaw mechanism and flavor symmetry theories. We show that light sterile neutrinos can rather easily be accommodated in the popular A 4 flavor symmetry models. The exact tri-bimaximal mixing pattern is perturbed due to active-sterile mixing, which we discuss in detail for one example. In addition, we find an interesting extension of the type I seesaw, which can provide a natural origin for eV-scale sterile neutrinos as well as visible admixtures between sterile and active neutrinos. We also show that the presence of sterile neutrinos would significantly change the observables in neutrino experiments, specifically the oscillation probabilities in short-baseline experiments and the effective mass in neutrino-less double beta decay. The latter can prove particularly helpful in strengthening the case for eV-scale sterile neutrinos.

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Authors and Affiliations

  1. Max-Planck-Institut für Kernphysik, Postfach 103980, 69029, Heidelberg, Germany

    James Barry, Werner Rodejohann & He Zhang

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  1. James Barry
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  2. Werner Rodejohann
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  3. He Zhang
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Correspondence to James Barry.

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ArXiv ePrint: 1105.3911

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Barry, J., Rodejohann, W. & Zhang, H. Light sterile neutrinos: models and phenomenology. J. High Energ. Phys. 2011, 91 (2011). https://doi.org/10.1007/JHEP07(2011)091

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