Triplet scalar dark matter and leptogenesis in an inverse seesaw model of neutrino mass generation

We propose a UV completion of the inverse seesaw scenario using fermion $\mathrm{SU}(2{)}_{\mathrm{L}}$ triplet representations. Within this framework, a variation of the standard thermal leptogenesis is achievable at the $\mathcal{O}(\mathrm{TeV})$ scale, owing to the presence of a viable dark matter candidate. This baryogenesis scenario is ruled out if a triplet fermion is observed at the LHC. The dark matter is given by the lightest neutral component of a complex scalar $\mathrm{SU}(2{)}_{\mathrm{L}}$ triplet, with mass $m_{\mathrm{DM}}$ in the TeV range. The scalar sector, which is enriched in order to account for the small neutrino masses, is treated in detail and shows potentially sizable Higgs boson $h\to \gamma \gamma$ rates together with large $h$ invisible branching ratios. DOI: http://dx.doi.org/10.1103/PhysRevD.87.036007 © 2013 American Physical Society