Fermion dark matter in gauge-Higgs unification

Abstract

We propose a Majorana fermion dark matter in the context of a simple gaugeHiggs Unification (GHU) scenario based on the gauge group SU(3)×U(1) ′ in 5-dimensional Minkowski space with a compactification of the 5th dimension on S 1 /Z 2 orbifold. The dark matter particle is identified with the lightest mode in SU(3) triplet fermions additionally introduced in the 5-dimensional bulk. We find an allowed parameter region for the dark matter mass around a half of the Standard Model Higgs boson mass, which is consistent with the observed dark matter density and the constraint from the LUX 2016 result for the direct dark matter search. The entire allowed region will be covered by, for example, the LUX-ZEPLIN dark matter experiment in the near future. We also show that in the presence of the bulk SU(3) triplet fermions the 125 GeV Higgs boson mass is reproduced through the renormalization group evolution of Higgs quartic coupling with the compactification scale of around 10 8 GeV.

Revisiting electroweak symmetry breaking and the Higgs boson mass in gauge-Higgs unification

“…The fact that the observed Higgs mass cannot be obtained without mirror fermions is consistent with the results in the third paper in [6] and the second paper in [10]. Furthermore, such mirror fermions have been pointed out as the possible dark matter candidate [10].…”

“…Such fermions may be a possible candidate of the dark matter as pointed out in Ref. [10]. The outline of this model is depicted in the Fig.…”

“…Such a pair of 15 representations is also natural from the viewpoint of the minimal dark matter scenario in the context of gauge-Higgs unification [10].…”

Fermionic minimal dark matter in 5D gauge-Higgs unification

“…For more details of our setup, in particular, bulk fermions including the SM fermions, see Ref. [10]. Now we discuss the DM sector in our model.…”

“…In our previous work [10], we have proposed such a MDM scenario in the context of a simple 5-dimensional GHU model based on the gauge group SU(3) × U(1) ′ with an orbifold S 1 /Z 2 compactification of the 5th dimension. We have introduced a pair of SU(3) triplet fermions in the bulk along with a bulk mass term and Majorana mass terms on the orbifold fixed point.…”