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

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arxiv 1607.07400 v3 pith:5X2R3IGJ submitted 2016-07-25 hep-ex physics.ins-det

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

PandaX-II Collaboration: Andi Tan , Mengjiao Xiao , Xiangyi Cui , Xun Chen , Yunhua Chen , Deqing Fang , Changbo Fu , Karl Giboni
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Franco Giuliani Haowei Gong Shouyang Hu Xingtao Huang Xiangdong Ji Yonglin Ju Siao Lei Shaoli Li Xiaomei Li Xinglong Li Hao Liang Qing Lin Huaxuan Liu Jianglai Liu Wolfgang Lorenzon Yugang Ma Yajun Mao Kaixuan Ni Xiangxiang Ren Michael Schubnell Manbin Shen Fang Shi Hongwei Wang Jiming Wang Meng Wang Qiuhong Wang Siguang Wang Xuming Wang Zhou Wang Shiyong Wu Xiang Xiao Pengwei Xie Binbin Yan Yong Yang Jianfeng Yue Xionghui Zeng Hongguang Zhang Hua Zhang Huanqiao Zhang Tao Zhang Li Zhao Jing Zhou Ning Zhou Xiaopeng Zhou
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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$\times10^4$ 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.

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