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

Spontaneously stabilised dark matter from a fermiophobic U(1)′ gauge symmetry
Spontaneously stabilised dark matter from a fermiophobic U(1)′ gauge symmetry
We consider the possibility that dark matter is stabilised by a discrete Z2 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 χ with half-integer charge is odd under the preserved Z2, 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.
1029-8479
Fu, B.
71c18b27-d30a-4e33-806b-e45ea5446e46
King, S.F.
f8c616b7-0336-4046-a943-700af83a1538
Fu, B.
71c18b27-d30a-4e33-806b-e45ea5446e46
King, S.F.
f8c616b7-0336-4046-a943-700af83a1538

Fu, B. and King, S.F. (2021) Spontaneously stabilised dark matter from a fermiophobic U(1)′ gauge symmetry. Journal of High Energy Physics, [121]. (doi:10.1007/JHEP12(2021)121).

Record type: Article

Abstract

We consider the possibility that dark matter is stabilised by a discrete Z2 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 χ with half-integer charge is odd under the preserved Z2, 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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Published date: December 2021

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Local EPrints ID: 456198
URI: http://eprints.soton.ac.uk/id/eprint/456198
ISSN: 1029-8479
PURE UUID: acdfcca4-b4cb-4c75-9f70-9f7be4a197e8

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Date deposited: 26 Apr 2022 16:46
Last modified: 28 Apr 2022 02:27

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