Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-05-19
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.
Barry James
Rodejohann Werner
Zhang He
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