SU (2)L doublet vector dark matter from gauge-Higgs unification

Abstract

A new vector dark matter (DM) scenario in the context of the gauge-Higgs unification (GHU) is proposed. The DM particle is identified with an electric-charge neutral component in an SU(2)L doublet vector field with the same quantum number as the Standard Model Higgs doublet. Since such an SU(2)L doublet vector field is incorporated in all models of the GHU scenario, it is always a primary and model-independent candidate for the DM in the scenario. The observed relic density is reproduced through DM pair annihilations into the weak gauge bosons with a TeV-scale DM mass, which is nothing but the compactification scale of extra dimensions. Due to the higher-dimensional gauge structure of the GHU scenario, a pair of the DM particles has no direct coupling with a single Z-boson/Higgs boson, so that the DM particle evades the severe constraint from the current direct DM search experiments.