A model of electroweakly interacting non-abelian vector dark matter

Abstract

We propose an electroweakly interacting spin-1 dark matter (DM) model. The electroweak gauge symmetry, SU(2)${}_L\times$U(1)${}_Y$, is extended into SU(2)${}_0\times$SU(2)${}_1\times$SU(2)${}_2\times$U(1)${}_Y$. A discrete symmetry exchanging SU(2)${}_0$ and SU(2)${}_2$ is imposed. This discrete symmetry stabilizes the DM candidate. The spin-1 DM particle ($V^0)$ and its SU(2)${}_L$ partners ($V^{\pm }$) interact with the Standard Model (SM) electroweak gauge bosons without any suppression factors. Consequently, pairs of DM particles efficiently annihilate into the SM particles in the early universe, and the measured value of the DM energy density is easily realized by the thermal freeze-out mechanism. The model also predicts a heavy vector triplet ($W^{\prime \pm }$ and $Z^{\prime }$) in the visible sector. They contribute to the DM annihilation processes. The mass ratio of $Z^{\prime }$ and $V^0$ determines values of various couplings, and constraints on $W^{\prime }$ and $Z^{\prime }$ restrict regions of the parameter space that are viable for DM physics. We investigate the constraints from perturbative unitarity of scalar and gauge couplings, the Higgs signal strength, $W^{\prime }$ search at the LHC, and DM direct detection experiments. It is found that the relic abundance of $V^0$ explains the right amount of the DM energy density for 3 TeV $\lesssim m_{V^0}\lesssim$ 19 TeV.

29 pages, 7 figures, 2 tables, the version published in JHEP

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• Complementary Searches of Low Mass Non-Abelian Vector Dark Matter, Dark Photon and Dark $Z^{\prime }$
• Minimal Consistent Dark Matter models for systematic experimental characterisation: Fermion Dark Matter
• Vector dark matter from split SU(2) gauge bosons
• Vector Boson Dark Matter From Trinification
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• Vector Dark Matter from the 5-Dimensional Representation of $SU(2{)}_L$
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