Light Sterile Neutrinos: Models and Phenomenology

Details Light Sterile Neutrinos: Models and Phenomenology Light Sterile Neutrinos: Models and Phenomenology

2011-05-19

arxiv.org/abs/1105.3911v2

JHEP 1107:091,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

30 pages, 6 figures; v2: minor additions, references added, matches published version

Scientific paper

10.1007/JHEP07(2011)091

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 to strengthen the case for eV-scale sterile neutrinos.

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