Neutrino masses, leptogenesis and dark matter in hybrid seesaw

Abstract

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.

4 pages

References in corpus (5)

• Right-Handed Neutrinos at LHC and the Mechanism of Neutrino Mass Generation
• Singlet fermionic dark matter
• Neutrino physics overview
• Unified picture for Dirac neutrinos, dark matter, dark energy and matter-antimatter asymmetry
• Origin of matter in the universe

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• Sterile neutrino dark matter, CDMS-II and a light Higgs boson
• Light Neutrinos from a Mini-Seesaw Mechanism in Warped Space
• Dark Matter in the Type Ib Seesaw Model
• Dilution of dark matter relic density in singlet extension models
• Leptogenesis, Dark Matter and Gravitational Waves from Discrete Symmetry Breaking
• Purely Triplet Seesaw and Leptogenesis within Cosmological Bound, Dark Matter and Vacuum Stability
• Singlet Fermion Assisted Dominant Seesaw with Lepton Flavor and Number Violations and Leptogenesis