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Direct dark matter searches, in particular the detection of WIMPs (Weakly Interacting Massive Particles) is a rapidly evolving field which has led to interesting but also highly controversial results during the last years. This article shortly reviews the state of the field as of summer 2011 and describes in some detail the recent results from the XENON100 experiment. XENON100 is a detector with 62 kg active volume located at the Gran Sasso underground laboratory in Italy. It is a two-phase liquid xenon TPC (Time Projection Chamber) where the light and charge produced are detected by photomultipliers. Xenon as detection medium has the advantage of combining a high WIMP sensitivity with an excellent self-shielding capability for background reduction. This year the collaboration has released science results from 100 days of data taken during 2010. No evidence for dark matter has been found and the experiment has set the world’s best limit on the WIMP-nucleon cross section. This limit probes already significant regions of the cross section and WIMP mass parameter space, as predicted by theories beyond the standard model of particle physics. The XENON100 result is in tension with the signal excesses reported by the DAMA, CoGeNT and CRESST experiments.

Mini-review of direct dark matter detection and recent XENON 100 results