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

Sin Kyu Kang, C. S. Kim

Research output: Contribution to journalArticle

47 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)248-252
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number5-6
Publication statusPublished - 2007 Mar 22

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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