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Low Energy WIMP Search Results from CDMS

Low Energy WIMP Search Results from CDMS. Lauren Hsu Fermilab for the CDMS Collaboration Slide material contributed by David Moore . Low Mass WIMPs. Lowering the CDMS Threshold. Lowering analysis threshold below 10 keV yields sensitivity to low mass WIMPs in region of contention.

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Low Energy WIMP Search Results from CDMS

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  1. Low Energy WIMP Search Results from CDMS Lauren Hsu Fermilab for the CDMS Collaboration Slide material contributed by David Moore Pheno 2011

  2. Low Mass WIMPs Pheno 2011

  3. Lowering the CDMS Threshold • Lowering analysis threshold below 10 keV yields sensitivity to low mass WIMPs in region of contention. • The cost = sacrifice some background rejection due to worsening timing resolution. Accept > 1 event background. Pheno 2011

  4. Low Threshold Dataset Pheno 2011

  5. Energy Calibration Pheno 2011

  6. Candidate Events Pheno 2011

  7. 90% C.L. Limits Pheno 2011

  8. Background Composition Pheno 2011

  9. Comparison to CoGeNT Data Pheno 2011

  10. Naive Energy Rescaling Pheno 2011

  11. Summary Ahmed et al., PRL 106 131302 (2011), arXiv: 1011.2482 • Presented analysis of CDMSII data with threshold lowered from 10 to 2 keV • Backgrounds present in this analysis have been characterized. No excess events over expected background were observed • Despite no background subtraction, observed rate of events is incompatible with interpretation of CoGeNT and DAMA data as evidence for spin-independent elastic scattering of WIMPs • Compatibility between CDMS and CoGeNT data requires majority of CoGeNT excess to be due to background and unexpectedly small CDMS background Pheno 2011

  12. Shallow Site Comparison Pheno 2011

  13. Zero Charge Events Pheno 2011

  14. Background Composition Pheno 2011

  15. Candidate Events Pheno 2011

  16. Rate by Detector Pheno 2011

  17. CDMSLITE Pheno 2011

  18. blank Pheno 2011

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