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Phys Rev Lett. 2016 Sep 16;117(12):121303. Epub 2016 Sep 16.

Dark Matter Results from First 98.7 Days of Data from the PandaX-II Experiment.

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Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
INPAC and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai Laboratory for Particle Physics and Cosmology, Shanghai 200240, China.
Yalong River Hydropower Development Company, Ltd., 288 Shuanglin Road, Chengdu 610051, China.
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 201800, Shanghai, China.
Key Laboratory of Nuclear Data, China Institute of Atomic Energy, Beijing 102413, China.
School of Physics and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Jinan 250100, China.
Center of High Energy Physics, Peking University, Beijing 100871, China.
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Department of Physics, University of Michigan, Ann Arbor, Michigan, 48109, USA.
School of Physics, Peking University, Beijing 100871, China.
Department of Physics, Tsinghua University, Beijing 100084, China.


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 3.3×10^{4}  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/c^{2}. The best upper limit on the scattering cross section is found 2.5×10^{-46}  cm^{2} for the WIMP mass 40  GeV/c^{2} at 90% confidence level.

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