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

Understand

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}.