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Weakly Interacting Massive Particles (WIMPs) are one of the leadingcandidates for Dark Matter. For understanding the properties of WIMPs andidentifying them among new particles produced at colliders (hopefully in thenear future), determinations of their mass and their couplings on nucleons fromdirect Dark Matter detection experiments are essential. Based on our method fordetermining the WIMP mass model-independently from experimental data, wepresent a way to also estimate the spin-independent (SI) WIMP-nucleon couplingby using measured recoil energies directly. This method isindependent of the asyet unknown velocity distribution of halo WIMPs. In spite of the uncertainty ofthe local WIMP density (of a factor of ~ 2), at least an upper limit on the SIWIMP-nucleon coupling could be given, once two (or more) experiments withdifferent target nuclei obtain positive signals. In a background-freeenvironment, for a WIMP mass of 100 GeV its SI coupling on nucleons could inprinciple be estimated with a statistical error of only ~ 15% with just 50events from each experiment.

Constraining the Spin-Independent WIMP-Nucleon Coupling from Direct Dark Matter Detection Data