The next generation of large scale WIMP direct detection experiments have thepotential to go beyond the discovery phase and reveal detailed informationabout both the particle physics and astrophysics of dark matter. We report hereon early results arising from the development of a detailed numerical codemodeling the proposed DARWIN detector, involving both liquid argon and xenontargets. We incorporate realistic detector physics, particle physics andastrophysical uncertainties and demonstrate to what extent two targets withsimilar sensitivities can remove various degeneracies and allow a determinationof dark matter cross sections and masses while also probing rough aspects ofthe dark matter phase space distribution. We find that, even assuming dominanceof spin-independent scattering, multi-ton scale experiments still havedegeneracies that depend sensitively on the dark matter mass, and on thepossibility of isospin violation and inelasticity in interactions. We find thatthese experiments are best able to discriminate dark matter properties for darkmatter masses less than around 200 GeV. In addition, and somewhat surprisingly,the use of two targets gives only a small improvement (aside from the advantageof different systematics associated with any claimed signal) in the ability topin down dark matter parameters when compared with one target of largerexposure.
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