Extended double seesaw model for neutrino mass spectrum and low scale leptogenesis

Details Extended double seesaw model for neutrino mass spectrum and low scale leptogenesis Extended double seesaw model for neutrino mass spectrum and low scale leptogenesis

2006-07-06

arxiv.org/abs/hep-ph/0607072v3

Phys.Lett.B646:248-252,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTex 12 pages, 1 figure, title changed, typos corrected, numerical results improved, to appear in Phys. Lett. B

Scientific paper

10.1016/j.physletb.2006.12.071

We consider a variant of seesaw mechanism by introducing extra singlet neutrinos, with which we show how the low scale leptogenesis is realized without imposing the tiny mass splitting between two heavy Majorana neutrinos required in the resonant leptogenesis. Thus, we can avoid the so-called gravitino problem when our scenario is supersymmetrized. We show that an introduction of the new singlet fermion leads to a new contribution which can enhance the lepton asymmetry for certain range of parameter space. We also examine how both the light neutrino mass spectrum and relatively light sterile neutrinos of order a few 100 MeV can be achieved without being in conflict with the constraints on the mixing between the active and sterile neutrinos.

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