Dark Matter Results from First 98.7-day Data of PandaX-II Experiment

Abstract

We report the 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$\times 10^4$ 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 3.5 and 1000 GeV/c${}^2$. The best upper limit on the scattering cross section is found $2.5\times 10^{-46}$ cm${}^2$ for the WIMP mass 40 GeV/c${}^2$ at 90% confidence level.

version accepted by PRL, 12 pages, 5+11 figures (including supplementary materials), 4 tables

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