Article

# Complementarity of Dark Matter Direct Detection Targets

Physical review D: Particles and fields 12/2010; DOI: 10.1103/PhysRevD.83.083505

Source: arXiv

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**ABSTRACT:**Fitting the model "A" to dark matter direct detection data, when the model that underlies the data is "B", introduces a theoretical bias in the fit. We perform a quantitative study of the theoretical bias in dark matter direct detection, with a focus on assumptions regarding the dark matter interactions, and velocity distribution. We address this problem within the effective theory of isoscalar dark matter-nucleon interactions mediated by a heavy spin-1 or spin-0 particle. We analyze 24 benchmark points in the parameter space of the theory, using frequentist and Bayesian statistical methods. First, we simulate the data of future direct detection experiments assuming a momentum/velocity dependent dark matter-nucleon interaction, and an anisotropic dark matter velocity distribution. Then, we fit a constant scattering cross section, and an isotropic Maxwell-Boltzmann velocity distribution to the simulated data, thereby introducing a bias in the analysis. The best fit values of the dark matter particle mass differ from their benchmark values up to 2 standard deviations. The best fit values of the dark matter-nucleon coupling constant differ from their benchmark values up to several standard deviations. We conclude that common assumptions in dark matter direct detection are a source of potentially significant bias.Journal of Cosmology and Astroparticle Physics 07/2014; 2014(09). · 5.88 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**Cosmological observations and the dynamics of the Milky Way provide ample evidence for an invisible and dominant mass component. This so-called dark matter could be made of new, colour and charge neutral particles, which were non-relativistic when they decoupled from ordinary matter in the early universe. Such weakly interacting massive particles (WIMPs) are predicted to have a non-zero coupling to baryons and could be detected via their collisions with atomic nuclei in ultra-low background, deep underground detectors. Among these, detectors based on liquefied noble gases have demonstrated tremendous discovery potential over the last decade. After briefly introducing the phenomenology of direct dark matter detection, I will review the main properties of liquified argon and xenon as WIMP targets and discuss sources of background. I will then describe existing and planned argon and xenon detectors that employ the so-called single- and dual-phase detection techniques, addressing their complementarity and science reach.Physics of the Dark Universe. 09/2014; - [Show abstract] [Hide abstract]

**ABSTRACT:**We study phenomenological constraints in a simple SĒχy extension of the Standard Model 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 SĒχy. The model is an explicit perturbative realization of so-called magnetic dark matter. The field content allows for a cancellation 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 upcoming ton-scale direct detection experiments. We conclude this work by discussing different variations of the model.Physical Review D 02/2014; 89(5). · 4.86 Impact Factor

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