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Institute for the Physics and Mathematics of the UniverseWPI

IPMU seminar

Date: November 6, 2008, 13:30 - 14:30
Place: Seminar Room at IPMU Prefab. B, Kashiwa Campus of the University of Tokyo
Speaker: Chun-Lin Shan (Seoul National U.)
Title: Identifying Weakly Interacting Massive Particles from Direct Dark Matter Detection Data [PDF]
Abstract: Weakly Interacting Massive Particles (WIMPs) are one of the leading candidates for Dark Matter. Currently, the most promising method to detect many different WIMP candidates is the direct detection of the recoil energy deposited in a low--background laboratory detector by elastic scattering of ambient WIMPs on the target nuclei. For understanding the properties of WIMPs and identifying them among new particles produced at colliders (hopefully in the near future), determinations of their mass and their couplings on nucleons from direct Dark Matter detection experiments are essential.
We developed new model--independent processes for determining the mass and the couplings of WIMPs by using experimental data (i.e., measured recoil energies) directly. Our methods are independent of the local density and the velocity distribution of halo WIMPs near the Earth, as well as of the WIMP--nucleus cross section or of the WIMP mass; all of them are as yet unknown. In a background--free environment, once two (or more) experiments with different target nuclei obtain positive signals, one could in principle estimate these quantities with a statistical error of 15 | 30% with only 50 events from each experiment.