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Weakly Interacting Massive Particles (WIMPs) are one of the leadingcandidates for Dark Matter. So far the usual procedure for constraining theWIMP-nucleon cross sections in direct Dark Matter detection experiments havebeen to fit the predicted event rate based on some model(s) of the Galactichalo and of WIMPs to experimental data. One has to assume whether thespin-independent (SI) or the spin-dependent (SD) WIMP-nucleus interactiondominates, and results of such data analyses are also expressed as functions ofthe as yet unknown WIMP mass. In this article, I introduce methods forextracting information on the WIMP-nucleon cross sections by considering ageneral combination of the SI and SD interactions. Neither prior knowledgeabout the local density and the velocity distribution of halo WIMPs nor abouttheir mass is needed. Assuming that an exponential-like shape of the recoilspectrum is confirmed from experimental data, the required information are onlythe measured recoil energies (in low energy ranges) and the number of events inthe first energy bin from two or more experiments.

Determining Ratios of WIMP-Nucleon Cross Sections from Direct Dark Matter Detection Data