low energy wimp search results from cdms
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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Low Energy WIMP Search Results from
CDMSLauren Hsu
Fermilabfor
the CDMS CollaborationSlide material contributed by David Moore
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Low Mass WIMPs
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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.
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Low Threshold Dataset
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Energy Calibration
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Candidate Events
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90% C.L. Limits
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Background Composition
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Comparison to CoGeNT Data
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Naive Energy Rescaling
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Summary• 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
Ahmed et al., PRL 106 131302 (2011), arXiv: 1011.2482
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Shallow Site Comparison
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Zero Charge Events
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Background Composition
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Candidate Events
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Rate by Detector
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CDMSLITE
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