Abstract
We study simple effective models of fermionic WIMP dark matter, where the dark matter candidate is a mixture of a Standard Model singlet and an n-plet of SU2L with n ≥ 3, stabilized by a discrete symmetry. The dark matter mass is assumed to be around the electroweak scale, and the mixing is generated by higher-dimensional operators, with a cutoff scale ≳TeV. For appropriate values of the mass parameters and the mixing we find that the observed dark matter relic density can be generated by coannihilation. Direct detection experiments have already excluded large parts of the parameter space, and the next-generation experiments will further constrain these models.
Highlights
From some extension of the Standard Model which solves the electroweak hierarchy problem
We study simple effective models of fermionic WIMP dark matter, where the dark matter candidate is a mixture of a Standard Model singlet and an n-plet of SU2L with n ≥ 3, stabilized by a discrete symmetry
We have studied simple effective models for WIMP dark matter, where the electroweakscale particle content is given by a fermionic singlet and a fermionic SU(2) n-plet with n ≥ 3 in addition to that of the Standard Model
Summary
Can we reproduce the observed dark matter relic density with a single electroweak-scale singlet χ, with all other states substantially heavier (e.g. with masses Λ TeV) such that they should be integrated out at low energies, thereby inducing the coupling κ?. (We will see that (M − m) ∼ few · 10 GeV for the cases of interest.) eq (2.10) may be a poor approximation to the true mixing angle if the coupling λ is accidentally so small that the higher-order terms in the v/Λ expansion dominate This is e.g. the case in the bino-wino scenario of the MSSM if either μ is small or tan β is large, roughly for μ mZ tan β.
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