期刊
PHYSICAL REVIEW D
卷 94, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.94.092001
关键词
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资金
- National Science Foundation
- Swiss National Science Foundation
- Deutsche Forschungsgemeinschaft
- Max Planck Gesellschaft
- Foundation for Fundamental Research on Matter
- Weizmann Institute of Science
- I-CORE
- Initial Training Network Invisibles (Marie Curie Actions) [PITN-GA-2011-289442]
- Fundacao para a Ciencia e a Tecnologia
- Region des Pays de la Loire
- Knut and Alice Wallenberg Foundation
- Istituto Nazionale di Fisica Nucleare
- Laboratori Nazionali del Gran Sasso
- Division Of Physics
- Direct For Mathematical & Physical Scien [1413495, 1413358] Funding Source: National Science Foundation
We perform a low-mass dark matter search using an exposure of 30 kg x yr with the XENON100 detector. By dropping the requirement of a scintillation signal and using only the ionization signal to determine the interaction energy, we lowered the energy threshold for detection to 0.7 keV for nuclear recoils. No dark matter detection can be claimed because a complete background model cannot be constructed without a primary scintillation signal. Instead, we compute an upper limit on the WIMP-nucleon scattering cross section under the assumption that every event passing our selection criteria could be a signal event. Using an energy interval from 0.7 keV to 9.1 keV, we derive a limit on the spin-independent WIMP-nucleon cross section that excludes WIMPs with a mass of 6 GeV/c(2) above 1.4 x 10(-41) cm(2) at 90% confidence level.
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