We report the weakly interacting massive particle (WIMP) dark matter search results using the first physics-run data of the PandaX-II 500 kg liquid xenon dual-phase time-projection chamber, operating at the China JinPing underground laboratory. No dark matter candidate is identified above background. In combination with the data set during the commissioning run, with a total exposure of 3.3 ×104 kg day , the most stringent limit to the spin-independent interaction between the ordinary and WIMP dark matter is set for a range of dark matter mass between 5 and 1000 GeV /c2 . The best upper limit on the scattering cross section is found 2.5 ×10-46 cm2 for the WIMP mass 40 GeV /c2 at 90% confidence level.
Physical Review Letters
- Pub Date:
- September 2016
- High Energy Physics - Experiment;
- Physics - Instrumentation and Detectors
- version accepted by PRL, 12 pages, 5+11 figures (including supplementary materials), 4 tables