Neutrino masses, leptogenesis and dark matter in hybrid seesaw

Details Neutrino masses, leptogenesis and dark matter in hybrid seesaw Neutrino masses, leptogenesis and dark matter in hybrid seesaw

2008-11-06

arxiv.org/abs/0811.0953v1

Phys.Rev.D79:033010,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages

Scientific paper

10.1103/PhysRevD.79.033010

We suggest a hybrid seesaw model where relatively ``light''right-handed neutrinos give no contribution to the neutrino mass matrix due to a special symmetry. This allows their Yukawa couplings to the standard model particles to be relatively strong, so that the standard model Higgs boson can decay dominantly to a left and a right-handed neutrino, leaving another stable right-handed neutrino as cold dark matter. In our model neutrino masses arise via the type-II seesaw mechanism, the Higgs triplet scalars being also responsible for the generation of the matter-antimatter asymmetry via the leptogenesis mechanism.

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