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

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

2010-06-28

arxiv.org/abs/1006.5458v2

JHEP 1009:060,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

v2: JHEP accepted version, 19 pages, 9 figures

Scientific paper

10.1007/JHEP09(2010)060

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.

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