Dark Matter Results from 54-Ton-Day Exposure of PandaX-II Experiment
Shanghai Jiao Tong University · Xinjiang University · +6 more institutions
Abstract
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 0.8×10^{-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 5.4×10^{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 8.6×10^{-47} cm^{2} at 40 GeV/c^{2}.
Citation impact
- FWCI
- 243.75
- Percentile
- 100%
- References
- 26
Authors
56Topics & keywords
- Physics
- WIMP
- Particle physics
- Dark matter
- Nuclear physics
- Reduced inequalities