Hidden from View: Neutrino Masses, Dark Matter and TeV-Scale Leptogenesis in a Neutrinophilic 2HDM

Abstract

We consider a simple extension of the Standard Model providing dark matter and a TeV-scale seesaw mechanism that also allows for viable leptogenesis. In addition to the Standard Model degrees of freedom, the model contains a neutrinophilic Higgs doublet, a scalar singlet, and six singlet fermions (including three right-handed Majorana neutrinos) that are charged under a local $U(1{)}^{\prime }$ gauge symmetry. We show how the $U(1{)}^{\prime }$ charge assignments and the choice of scalar potential can lead to a TeV-scale seesaw mechanism and $\mathcal{O}(1)$ neutrino Yukawa couplings in a straightforward way. While this scenario has all the ingredients one would expect for significant experimental signatures, including several new TeV scale degrees of freedom, we find that most distinctive features associated with neutrino mass generation, leptogenesis and the dark sector are likely to remain inaccessible in the absence of additional lepton flavor symmetries.

23 pages, 5 figures. Minor corrections, reference updated

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• First order electroweak phase transition triggered by the Higgs portal vector dark matter
• Hunting for Heavy Majorana Neutrinos with Lepton Number Violating Signatures at LHC
• Collider Bounds on 2-Higgs Doublet Models with $U(1{)}_X$ Gauge Symmetries
• Majorana Dark matter with B+L gauge symmetry
• Leptogenesis and Dark Matter from Low Scale Seesaw
• Dark Matter in the Type Ib Seesaw Model
• Phenomenology of the gauge symmetry for right-handed fermions
• Exploring collider aspects of a neutrinophilic Higgs doublet model in multilepton channels
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• The Higgs Seesaw Induced Neutrino Masses and Dark Matter
• Gravitational Wave Imprint of New Symmetry Breaking
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• Vector Dark Matter in a $U(1{)}_X$ extended 2HDM
• The Hilbert Series and the Flavor Invariants of the 3HDM