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 recoil energies between 10–100 keV. A blind analysis was performed using only calibrationdata to define the energy threshold and selection criteria for nuclear-recoil candidates. Using thestandard dark-matter halo and nuclear-physics WIMP model, these data set the world’s lowestexclusion limits on the coherent WIMP-nucleon scalar cross-section for all WIMP masses above15 GeV/c