Type-II seesaws at colliders, lepton asymmetry and singlet scalar dark matter
- Cosmology and Astroparticle Physics Group, University of Lancaster, Lancaster LA1 4YB (United Kingdom)
- Theory Division, Physical Research Laboratory, Navarangpura, Ahmedabad, 380 009 (India)
We propose an extension of the standard model with a B-L global symmetry that is broken softly at the TeV scale. The neutrinos acquire masses through a type-II seesaw while the lepton (L) asymmetry arises in the singlet sector but without B-L-number violation. The model has the virtue that the scale of L-number violation ({Lambda}) giving rise to neutrino masses is independent of the scale of leptogenesis ({Lambda}'). As a result the model can explain neutrino masses, singlet scalar dark matter and leptogenesis at the TeV scale. The stability of the dark matter is ensured by a surviving Z{sub 2} symmetry, which could be lifted at the Planck scale, thereby allowing Planck scale suppressed decay of singlet scalar dark matter particles of mass Almost-Equal-To 3 MeV to e{sup +}e{sup -} pairs in the Galactic halo. The model also predicts a few hundred GeV doubly charged scalar and a long-lived charged fermion, whose decay can be studied at the Large Hadron Collider (LHC) and International Linear Collider (ILC)
- OSTI ID:
- 22137862
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2008, Issue 04; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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