Generalized Inverse Seesaws

Abstract

The seesaw mechanism can be generalized to a Type-III variant and a quintuplet variant. We present two models that provide analogous generalizations of the inverse seesaw mechanism. The first model employs a fermion triplet F ~ (1,3,0) and requires no additional multiplets or parameters relative to the standard inverse seesaw. We argue that, from a bottom-up perspective, there appears to be no particular reason to preference the usual scenario over this variant. The second model employs a fermion quintuplet F ~ (1,5,0) and requires an additional scalar S ~ (1,4,1). We also show that minimal inverse seesaws with even larger fermionic representations are not expected to realize naturally small neutrino masses.

1+10 pages; v2: PRD version (added references and brief pheno discussion)

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• Type-III see-saw at LHC
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• Heavy Neutral Leptons at Muon Colliders
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• Doubly-charged Higgs Boson at Future Electron-Proton Collider
• Hunting for Heavy Majorana Neutrinos with Lepton Number Violating Signatures at LHC
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• Resonant leptogenesis in (2,2) inverse see-saw realisation
• Evaluation of the Majorana Phases of a General Majorana Neutrino Mass Matrix: Testability of hierarchical Flavour Models
• A Linear seesaw model with hidden gauge symmetry
• Naturalness and lepton number/flavor violation in inverse seesaw models
• Searches for heavy neutrinos at multi-TeV muon collider : a resonant leptogenesis perspective
• LHC Signatures for Cascade Seesaw Mechanism
• The Higgs Seesaw Induced Neutrino Masses and Dark Matter
• Inverse seesaw and dark matter in a gauged $\mathrm{B}-\mathrm{L}$ extension with flavour symmetry
• Neutrino masses from new seesaw models: Low-scale variants and phenomenological implications
• Probing Models of Neutrino Masses via the Flavor Structure of the Mass Matrix
• Effective field theory versus UV-complete model: vector boson scattering as a case study
• Fermion Mass and Mixing in a Low-Scale Seesaw Model based on the S4 Flavor Symmetry
• An inverse seesaw model with natural hierarchy at TeV scale
• Scotogenic neutrino mass with large $SU(2{)}_L$ multiplet fields
• Minimal Tree-Level Seesaws with a Heavy Intermediate Fermion
• Resonant leptogenesis in inverse see-saw framework with modular $S_4$ symmetry