4.4 Article

Spontaneously stabilised dark matter from a fermiophobic U(1)′ gauge symmetry

Journal

JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 12, Pages -

Publisher

SPRINGER
DOI: 10.1007/JHEP12(2021)121

Keywords

Cosmology of Theories beyond the SM; Neutrino Physics

Funding

  1. Chinese Scholarship Council (CSC) [201809210011, [2018]3101, [2019]536]
  2. STFC [ST/L000296/1]
  3. European Union [H2020-MSCA-ITN-2019//860881-HIDDeN]

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The study explores the possibility of dark matter being stabilized by a discrete Z(2) symmetry and considers different models to explain the production and properties of dark matter.
We consider the possibility that dark matter is stabilised by a discrete Z(2) symmetry which arises from a subgroup of a U(1)' gauge symmetry, spontaneously broken by integer charged scalars, and under which the chiral quarks and leptons do not carry any charges. A chiral fermion chi with half-integer charge is odd under the preserved Z(2), and hence becomes a stable dark matter candidate, being produced through couplings to right-handed neutrinos with vector-like U(1)' charges, as in the type Ib seesaw mechanism. We calculate the relic abundance in such a low energy effective seesaw model containing few parameters, then consider a high energy renormalisable model with a complete fourth family of vector-like fermions, where the chiral quark and lepton masses arise from a seesaw-like mechanism. With the inclusion of the fourth family, the lightest vector-like quark can contribute to the dark matter production, enlarging the allowed parameter space that we explore.

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