Type II See-Saw at Collider, Lepton Asymmetry and Singlet Scalar Dark Matter.

McDonald, John and Sahu, Narendra and Sarkar, Utpal (2008) Type II See-Saw at Collider, Lepton Asymmetry and Singlet Scalar Dark Matter. Journal of Cosmology and Astroparticle Physics, 2008 (4). p. 37. ISSN 1475-7516

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Abstract

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 (Λ) giving rise to neutrino masses is independent of the scale of leptogenesis (Λ'). 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 Z2 symmetry, which could be lifted at the Planck scale, thereby allowing Planck scale suppressed decay of singlet scalar dark matter particles of mass 3 MeV to e+e- 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).

Item Type: Journal Article
Journal or Publication Title: Journal of Cosmology and Astroparticle Physics
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/qc
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 11387
Deposited By: Dr John McDonald
Deposited On: 14 Aug 2008 10:04
Refereed?: Yes
Published?: Published
Last Modified: 18 Aug 2019 00:35
URI: https://eprints.lancs.ac.uk/id/eprint/11387

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