We report on a search for particle dark matter with the XENON100 experiment, operated at the Laboratori Nazionali del Gran Sasso for 13 months during 2011 and 2012. XENON100 features an ultralow electromagnetic background of (5.3±0.6)×10-3events/(keVee×kg×day) in the energy region of interest. A blind analysis of 224.6livedays×34kg exposure has yielded no evidence for dark matter interactions. The two candidate events observed in the predefined nuclear recoil energy range of 6.6-30.5keVnr are consistent with the background expectation of (1.0±0.2) events. A profile likelihood analysis using a 6.6-43.3keVnr energy range sets the most stringent limit on the spin-independent elastic weakly interacting massive particle-nucleon scattering cross section for weakly interacting massive particle masses above 8GeV/c2, with a minimum of 2×10-45cm2 at 55GeV/c2 and 90% confidence level.
Physical Review Letters
- Pub Date:
- November 2012
- Dark matter;
- Supersymmetric partners of known particles;
- Radiation detectors;
- Neutrino muon pion and other elementary particle detectors;
- cosmic ray detectors;
- Astrophysics - Cosmology and Extragalactic Astrophysics;
- High Energy Physics - Experiment;
- High Energy Physics - Phenomenology;
- Physics - Instrumentation and Detectors
- 6 pages, 5 figures. Matches version accepted by PRL. Includes limits up to 10 TeV/c^2, published as supplementary material: http://prl.aps.org/supplemental/PRL/v109/i18/e181301 Please cite high mass limits as "Phys. Rev. Lett. 109, 181301 (2012), online supplementary material."