Dresden 2013 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 21: Astroteilchenphysik und Kosmologie (Theorie)
T 21.3: Vortrag
Mittwoch, 6. März 2013, 17:15–17:30, WIL-B122
On the spin-dependent sensitivity of XENON100. — Mathias Garny1, Alejandro Ibarra2, Miguel Pato2, and •Stefan Vogl2 — 1Desy — 2TUM
The latest XENON100 data severely constrains dark matter elastic scattering off nuclei, leading to impressive upper limits on the spin-independent cross-section. We show that the constraints set by XENON100 on the spin-dependent neutron cross-section are by far the best at present, whereas the corresponding spin-dependent proton limits lag behind other direct detection results. The effect of nuclear uncertainties on the structure functions of xenon isotopes is analysed in detail and found to lessen the robustness of the constraints, especially for spin-dependent proton couplings. We apply our constraints to well-motivated dark matter models and demonstrate that in both mass-degenerate scenarios and the minimal supersymmetric standard model the spin-dependent neutron limits can actually override the spin-independent limits. This opens the possibility of probing additional unexplored regions of the dark matter parameter space.