Journal
PHYSICS LETTERS B
Volume 720, Issue 1-3, Pages 130-136Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2013.01.059
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Funding
- National Science Foundation [PHY-0968854]
- European Council Starting Grant [277591]
- European Research Council (ERC) [277591] Funding Source: European Research Council (ERC)
- Direct For Mathematical & Physical Scien
- Division Of Physics [968854] Funding Source: National Science Foundation
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We discuss aspects of a scenario for co-genesis of matter and dark matter which extends the standard model by adding a fourth generation vector-like lepton doublet and show that if the fourth neutrino is a massive pseudo-Dirac fermion with mass in the few hundred GeV range and mass splitting of about 100 key, its lighter component can be a viable inelastic dark matter candidate. Its relic abundance is produced by the CP violating out-of-equilibrium decay of the type-II seesaw scalar triplet, which also gives rise to the required baryon asymmetry of the Universe via type-ll leptogenesis, thus providing a simultaneous explanation of dark matter and baryon abundance observed today. Moreover, the induced vacuum expectation value of the same scalar triplet is responsible for the sub-eV Majorana masses to the three active neutrinos. A stable fourth generation of neutrinos is elusive at collider, however might be detected by current dark matter direct search experiments. (C) 2013 Elsevier B.V. All rights reserved.
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