期刊
PHYSICAL REVIEW LETTERS
卷 119, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.119.181302
关键词
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资金
- Shanghai Jiao Tong University [985-III]
- National Natural Science Foundation of China [11365022, 11435008, 11455001, 11505112, 11525522]
- Ministry of Science and Technology of China [2016YFA0400301]
- Office of Science and Technology, Shanghai Municipal Government [11DZ2260700, 16DZ2260200]
- Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education
- Chinese Academy of Sciences Center for Excellence in Particle Physics (CCEPP)
- Hongwen Foundation in Hong Kong
- CJPL administration
- Yalong River Hydropower Development Company Ltd.
We report a new search for weakly interacting massive particles (WIMPs) using the combined low background data sets acquired in 2016 and 2017 from the PandaX-II experiment in China. The latest data set contains a new exposure of 77.1 live days, with the background reduced to a level of 0.8 x 10(-3) evt/kg/day, improved by a factor of 2.5 in comparison to the previous run in 2016. No excess events are found above the expected background. With a total exposure of 5.4 x 10(4) kg day, the most stringent upper limit on the spin-independent WIMP-nucleon cross section is set for a WIMP with mass larger than 100 GeV/c(2), with the lowest 90% C.L. exclusion at 8.6 x 10(-47) cm(2) at 40 GeV/c(2).
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