A Search for WIMPs with the First Five-Tower Data from CDMS

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  • 24 February 2008
Abstract
We report first results from the Cryogenic Dark Matter Search (CDMS II) experiment running with its full complement of 30 cryogenic particle detectors at the Soudan Underground Laboratory. This report is based on the analysis of data from 15 Ge detectors (3.75 kg) acquired between October 2006 and July 2007 for an effective exposure of 121.3 kg-d (averaged over recoil energies 10--100 keV, weighted for a weakly interacting massive particle (WIMP) mass of 60 GeV/c^2). A blind analysis, incorporating improved techniques for rejecting surface events and estimating background leakage into the signal region, resulted in zero observed events. This analysis sets an upper limit on the WIMP-nucleon spin-independent cross section of 6.6x10^{-44} cm^2 (4.6x10^{-44} cm^2 when combined with previous CDMS data) at the 90% confidence level for a WIMP mass of 60 GeV/c^2. By excluding new parameter space for WIMP dark matter with masses above 42 GeV/c^2 this work significantly restricts some of the favored supersymmetric models.

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