LUX Constraints on Magnetic Dark Matter in the SEχy Model with(out) Naturality

Preprint number: CP3-Origins-2013-48 DNRF90 and DIAS-2013-48
Authors: Mads T. Frandsen (CP3-Origins & DIAS), Francesco Sannino (CP3-Origins & DIAS), Ian M. Shoemaker (CP3-Origins & DIAS), and Ole Svendsen (CP3-Origins & DIAS)
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We study phenomenological constraints in a simple SEχy extension of the Standard Model
(SM) with a 125 GeV Higgs, a vectorlike heavy electron (E), a complex scalar electron (S) and a standard model singlet Dirac fermion (χ). The interactions among the dark matter candidate χ and the standard model particles occur via loop-induced processes involving the Yukawa interaction SEχy. 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.