First Results from the Cryogenic Dark Matter Search in the Soudan Underground Laboratory

Department of Physics, Santa Clara University, Santa Clara, CA 95053, USA(Dated: February 2, 2008)We report the first results from a search for weakly interacting massive particles( WIMPs) in theCryogenic Dark Matter Search (CDMS) experiment at the Soudan Underground Laboratory. FourGe and two Si detectors were operated for 52.6 live days, providing 19.4 kg-d of Ge net exposure aftercuts for recoilenergies between 10–100 keV. A blind analysis was performed using only calibrationdata to define the energy threshold and selection criteria for nuclear- recoilcandidates. Using thestandard dark-matter haloand nuclear-physics WIMPmodel, these data set the world’s lowestexclusion limits on the coherent WIMP-nucleon scalar cross-section for all WIMPmasses above15 GeV/c