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First dark matter results from the XENON100 experiment
E Aprile1, K Arisaka, F Arneodo
1Physics Department, Columbia University, New York, New York 10027, USA.
Physical Review Letters
|January 15, 2011
Summary
The XENON100 experiment found no dark matter events, excluding certain weakly interacting massive particle (WIMP) interactions. This result challenges interpretations of other dark matter detection signals.
Area of Science:
- Experimental particle physics
- Astroparticle physics
- Cosmology
Background:
- The nature of dark matter remains one of the most significant unsolved problems in physics.
- Weakly Interacting Massive Particles (WIMPs) are leading candidates for dark matter particles.
- Direct detection experiments aim to observe WIMP interactions with ordinary matter.
Purpose of the Study:
- To present the first dark matter results from the XENON100 experiment.
- To search for WIMP-nucleon elastic scattering using a liquid xenon detector.
- To set limits on WIMP-nucleon scattering cross sections.
Main Methods:
- Utilized a dual-phase time projection chamber with 62 kg of liquid xenon.
- Analyzed 11.17 live days of nonblind data collected in October-November 2009.
- Focused on a 40 kg fiducial target mass and a predefined signal region.
Main Results:
- Observed no events within the selected signal region.
- Excluded spin-independent WIMP-nucleon elastic scattering cross sections above 3.4 × 10⁻⁴⁴ cm² for 55 GeV/c² WIMPs at 90% confidence level.
- Constrained interpretations of CoGeNT and DAMA signals for light mass WIMPs (< 20 GeV/c²).
Conclusions:
- The XENON100 experiment sets stringent limits on WIMP-nucleon interactions.
- The results challenge certain WIMP models and interpretations of other experiments.
- Further data collection and analysis will improve sensitivity in the search for dark matter.
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