LUX Constraints on Magnetic Dark Matter in the $S\bar{E}\chi$y Model with(out) Naturality

Abstract

We study phenomenological constraints in a simple $S\bar{E}\chi$y extension of the Standard Model (SM) with a 125 GeV Higgs, a vector-like heavy electron $(E)$, a complex scalar electron $(S)$ and a standard model singlet Dirac fermion $(\chi )$. The interactions among the dark matter candidate $\chi$ and the standard model particles occur via loop-induced processes involving the Yukawa interaction $S\bar{E}\chi$y. The model is an explicit perturbative realization of so-called magnetic dark matter. The field content allows for a cancelation of quadratic divergences in the scalar masses at one-loop, a phenomenon which we refer to as perturbative naturality. The basic model is constrained dominantly by direct detection experiments and its parameter space can be nearly entirely covered by up-coming ton-scale direct detection experiments. We conclude this work by discussing different variations of the model.

17 pages, 3 figures; v2 matches PRD version

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• Dark matter direct detection of a fermionic singlet at one loop
• First Order Electroweak Phase Transition from (Non)Conformal Extensions of the Standard Model
• Bremsstrahlung and Gamma Ray Lines in 3 Scenarios of Dark Matter Annihilation
• WIMPs and Un-Naturalness
• The Dark Penguin Shines Light at Colliders