Shedding Light on the Dark Sector with Direct WIMP Production
Abstract
A Weakly Interacting Massive Particle (WIMP) provides an attractive dark matter candidate, and should be within reach of the next generation of high-energy colliders. We consider the process of direct WIMP pair-production, accompanied by an initial-state radiation photon, in electron-positron collisions at the proposed International Linear Collider (ILC). We present a parametrization of the differential cross section for this process which conveniently separates the model-independent information provided by cosmology from the model-dependent inputs from particle physics. As an application, we consider two simple models, one supersymmetric, and another of the "universal extra dimensions'' (UED) type. The discovery reach of the ILC and the expected precision of parameter measurements are studied in each model. For each of the two examples, we perform a shape-discrimination analysis of the photon energy spectrum and show that in a large part of the relevant parameter space it allows to rule out the alternative model interpretation.Keywords
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