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Abstract: Numerous ongoing experiments aim at detecting WIMP dark matter particles fromthe galactic halo directly through WIMP-nucleon interactions. Once such adetection is established a confirmation of the galactic origin of the signal isneeded. This requires a direction-sensitive detector. We show that such adetector can measure the velocity anisotropy beta of the galactic halo.Cosmological N-body simulations predict the dark matter anisotropy to benonzero, beta~0.2. Baryonic matter has beta=0 and therefore a detection of anonzero beta would be strong proof of the fundamental difference between darkand baryonic matter. We estimate the sensitivity for various detectorconfigurations using Monte Carlo methods and we show that the strongest signalis found in the relatively few high recoil energy events. Measuring beta to theprecision of ~0.03 will require detecting more than 10^4 WIMP events withnuclear recoil energies greater than 100 keV for a WIMP mass of 100 GeV and a32S target. This number corresponds to ~10^6 events at all energies. We discussvariations with respect to input parameters and we show that our method isrobust to the presence of backgrounds and discuss the possible improvedsensitivity for an energy-sensitive detector.



Autor: Ole Host, Steen H Hansen

Fuente: https://arxiv.org/







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