Stability and leptogenesis in the left-right symmetric seesaw mechanism

Details Stability and leptogenesis in the left-right symmetric seesaw mechanism Stability and leptogenesis in the left-right symmetric seesaw mechanism

2006-12-15

arxiv.org/abs/hep-ph/0612194v3

JHEP 0704:022,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 11 figures, latex; minor changes, published version

Scientific paper

10.1088/1126-6708/2007/04/022

We analyze the left-right symmetric type I+II seesaw mechanism, where an eight-fold degeneracy among the mass matrices of heavy right-handed neutrinos M_R is known to exist. Using the stability property of the solutions and their ability to lead to successful baryogenesis via leptogenesis as additional criteria, we discriminate among these eight solutions and partially lift their eight-fold degeneracy. In particular, we find that viable leptogenesis is generically possible for four out of the eight solutions.

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