Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-11-29
JCAP 0804:037,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, double column, references are added, minor change in title, section-III is revised, one figure is added, typos are co
Scientific paper
10.1088/1475-7516/2008/04/037
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 {\it singlet sector} but without B-L 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 {\it neutrino masses, singlet scalar dark matter and leptogenesis at the TeV scale}. The stability of the dark matter is ensured by a surviving $Z_2$ symmetry, which could be lifted at the Planck scale and thereby allowing Planck scale-suppressed decay of singlet scalar dark matter particles of mass $\approx 3$ 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 Large Hadron Collider (LHC) and International Linear Collider (ILC).
McDonald Janece
Sahu Narendra
Sarkar Utpal
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