Type-II Seesaw at Collider, Lepton Asymmetry and Singlet Scalar Dark Matter

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 {\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 (${\Lambda }^{\prime }$). 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).

8 pages, double column, references are added, minor change in title, section-III is revised, one figure is added, typos are corrected

References in corpus (9)

• Gauge Singlet Scalars as Cold Dark Matter
• The importance of N2 leptogenesis
• Collider Signatures of Singlet Extended Higgs Sectors
• Predictive model for dark matter, dark energy, neutrino masses and leptogenesis at the TeV scale
• Leptogenesis bound on neutrino masses in left-right symmetric models with spontaneous D-parity violation
• Right-Handed Sector Leptogenesis
• Leptogenesis and low energy CP phases with two heavy neutrinos
• Cosmology in a supersymmetric model with gauged $B-L$
• Low-Energy Thermal Leptogenesis in an Extended NMSSM Model

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