Exclusion limits on the WIMP-nucleon cross section from the first run of the Cryogenic Dark Matter Search in the Soudan Underground Laboratory

2005/07/08 by CDMS Collaboration, D. S. Akerib, M. S. Armel‐Funkhouser +50 · 1 citation
Physics and Astronomy · #Computer science #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Nuclear physics #Nucleon #Operating system #Particle physics #Particle physics theoretical and experimental studies #Physics #Section (typography) #WIMP #astro-ph #hep-ex

paper · pdf · doi:10.1103/physrevd.72.052009

published as Phys.Rev.D72:052009,2005 · 37 pages, 42 figures

arxiv created 2005/07/08 · openalex publication_date 2005/09/30 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

The Cryogenic Dark Matter Search (CDMS-II) employs low-temperature Ge and Si detectors to seek weakly interacting massive particles (WIMPs) via their elastic-scattering interactions with nuclei. Simultaneous measurements of both ionization and phonon energy provide discrimination against interactions of background particles. For recoil energies above 10 keV, events due to background photons are rejected with >99.99% efficiency. Electromagnetic events very near the detector surface can mimic nuclear recoils because of reduced charge collection, but these surface events are rejected with >96% efficiency by using additional information from the phonon pulse shape. Efficient use of active and passive shielding, combined with the 2090 m.w.e. overburden at the experimental site in the Soudan mine, makes the background from neutrons negligible for this first exposure. All cuts are determined in a blind manner from in situ calibrations with external radioactive sources without any prior knowledge of the event distribution in the signal region. Resulting efficiencies are known to \ensuremath∼10%. A single event with a recoil of 64 keV passes all of the cuts and is consistent with the expected misidentification rate of surface electron recoils. Under the assumptions for a standard dark matter halo, these data exclude previously unexplored parameter space for both spin-independent and spin-dependent WIMP-nucleon elastic scattering. The resulting limit on the spin-independent WIMP-nucleon elastic-scattering cross section has a minimum of 4\ifmmode×\else\texttimes\fi10^\ensuremath-43 cm² at a WIMP mass of 60 GeVc^\ensuremath-2. The minimum of the limit for the spin-dependent WIMP-neutron elastic-scattering cross section is 2\ifmmode×\else\texttimes\fi10^\ensuremath-37 cm² at a WIMP mass of 50 GeVc^\ensuremath-2.

Citations

• Measurements of Ω and Λ from 42 High‐Redshift Supernovae
• Dark matter in the finely tuned minimal supersymmetric standard model
• Neutralino dark matter detection in split supersymmetry scenarios
• Neutralino relic density including coannihilations
• New results from the Cryogenic Dark Matter Search experiment
• Review of mathematics, numerical factors, and corrections for dark matter experiments based on elastic nuclear recoil
• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Model-Independent Assessment of Current Direct Searches for Spin-Dependent Dark Matter
• Supersymmetric relics from the big bang
• First‐Year Wilkinson Microwave Anisotropy Probe ( WMAP ) Observations: Determination of Cosmological Parameters
• A new model-independent method for extracting spin-dependent cross section limits from dark matter searches
• Exclusion limits on the WIMP-nucleon cross section from the Cryogenic Dark Matter Search
• First Results from the Cryogenic Dark Matter Search in the Soudan Underground Laboratory
• Detection of Cosmic Dark Matter

Cited by

• Limits on Spin-Independent Interactions of Weakly Interacting Massive Particles with Nucleons from the Two-Tower Run of the Cryogenic Dark Matter Search
• The dark side of the universe