Collider signatures of sterile neutrinos in models with a gauge-singlet Higgs

Abstract

Sterile neutrinos have been invoked to explain the observed neutrino masses, but they can also have significant implications for cosmology and accelerator experiments. We explore the collider signatures of a simple extension of the Standard Model, where sterile neutrinos acquire their mass after electroweak symmetry breaking, via their coupling to a real singlet Higgs. In this model, heavy sterile neutrinos can be produced in accelerators from decays of the Higgs bosons. Their own decay can yield distinct signals, suggesting both the presence of an extended Higgs sector and the coupling of the singlet fermions to the latter. In the same scenario, a relic matter abundance arises from the decay of the singlet Higgs into weakly coupled keV sterile neutrinos. The coupling of the Higgs doublet to particles outside the Standard Model relaxes the current experimental bounds on its mass.

arXiv commentv2: JHEP accepted version, 19 pages, 9 figures

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Cited by in corpus (24)

• The Phenomenology of Right Handed Neutrinos
• keV Neutrino Model Building
• Lepton Number Violation in Higgs Decay at LHC
• Experimental bounds on sterile neutrino mixing angles
• Shedding Light on Neutrino Masses with Dark Forces
• Self-Interacting Dark Matter through the Higgs Portal
• Majorana Higgses at colliders
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• Probing the Decoupled Seesaw Scalar in Rare Higgs Decay
• Magnetic dipole moment and keV neutrino dark matter
• Heavy Neutrino Searches via Same-sign Lepton Pairs at the Higgs Factory
• Hidden-Sector Neutrinos and Freeze-In Leptogenesis
• Charged lepton mixing via heavy sterile neutrinos
• Phenomenology of Supersymmetric Models with a Symmetry-Breaking Seesaw Mechanism