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Results on low-mass weakly interacting massive particles from an 11 kg d target exposure of DAMIC at SNOLAB


Abstract

We present constraints on the existence of weakly interacting massive particles (WIMPs) from an 11 kg d target exposure of the DAMIC experiment at the SNOLAB underground laboratory. The observed energy spectrum and spatial distribution of ionization events with electron-equivalent energies >200  eVee in the DAMIC CCDs are consistent with backgrounds from natural radioactivity. An excess of ionization events is observed above the analysis threshold of 50  eVee. While the origin of this low-energy excess requires further investigation, our data exclude spin-independent WIMP-nucleon scattering cross sections σχ−n as low as 3×10−41  cm2 for WIMPs with masses mχ from 7 to 10  GeV c−2. These results are the strongest constraints from a silicon target on the existence of WIMPs with mχ<9  GeV c−2 and are directly relevant to any dark matter interpretation of the excess of nuclear-recoil events observed by the CDMS silicon experiment in 2013.

Abstract

We present constraints on the existence of weakly interacting massive particles (WIMPs) from an 11 kg d target exposure of the DAMIC experiment at the SNOLAB underground laboratory. The observed energy spectrum and spatial distribution of ionization events with electron-equivalent energies >200  eVee in the DAMIC CCDs are consistent with backgrounds from natural radioactivity. An excess of ionization events is observed above the analysis threshold of 50  eVee. While the origin of this low-energy excess requires further investigation, our data exclude spin-independent WIMP-nucleon scattering cross sections σχ−n as low as 3×10−41  cm2 for WIMPs with masses mχ from 7 to 10  GeV c−2. These results are the strongest constraints from a silicon target on the existence of WIMPs with mχ<9  GeV c−2 and are directly relevant to any dark matter interpretation of the excess of nuclear-recoil events observed by the CDMS silicon experiment in 2013.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:General Physics and Astronomy
Language:English
Date:10 December 2020
Deposited On:16 Dec 2020 15:48
Last Modified:16 Dec 2020 15:50
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Closed
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1103/physrevlett.125.241803
Project Information:
  • : FunderSNSF
  • : Grant ID200021_153654
  • : Project TitleThe search for dark matter using CCD detectors (DAMIC)

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