Dark Matter Results from 54-Ton-Day Exposure of PandaX-II Experiment

Xiangyi Cui(Shanghai Jiao Tong University), Abdusalam Abdukerim(Xinjiang University), Wei Chen(Shanghai Jiao Tong University), Xun Chen(Shanghai Jiao Tong University), Yunhua Chen(Yalong Hydro (China)), Binbin Dong(Shanghai Jiao Tong University), Deqing Fang(Chinese Academy of Sciences), Changbo Fu(Shanghai Jiao Tong University), Karl Giboni(Shanghai Jiao Tong University), Franco Giuliani(Shanghai Jiao Tong University), Linhui Gu(Shanghai Jiao Tong University), Yikun Gu(Shanghai Jiao Tong University), Xuyuan Guo(Yalong Hydro (China)), Zhifan Guo(Shanghai Jiao Tong University), K. Han(Shanghai Jiao Tong University), Changda He(Shanghai Jiao Tong University), Di Huang(Shanghai Jiao Tong University), Shengming He(Yalong Hydro (China)), Xingtao Huang(Shandong University), Zhou Huang(Shanghai Jiao Tong University), Xiangdong Ji(Shanghai Jiao Tong University), Yonglin Ju(Shanghai Jiao Tong University), Shaoli Li(Shanghai Jiao Tong University), Yao Li(Shanghai Jiao Tong University), Heng Lin(Shanghai Jiao Tong University), Huaxuan Liu(Shanghai Jiao Tong University), Jianglai Liu(Chinese Academy of Sciences), Y. G.(Chinese Academy of Sciences), Yajun Mao(Peking University), Kaixiang Ni(Shanghai Jiao Tong University), Jinhua Ning(Yalong Hydro (China)), Xiangxiang Ren(Shanghai Jiao Tong University), Fang Shi(Shanghai Jiao Tong University), Andi Tan(University of Maryland, College Park), Cheng Wang(Shanghai Jiao Tong University), Hongwei Wang(Chinese Academy of Sciences), Meng Wang(Shandong University), Qiuhong Wang(Chinese Academy of Sciences), Siguang Wang(Peking University), Xiuli Wang(Shanghai Jiao Tong University), Xuming Wang(Shanghai Jiao Tong University), Qinyu Wu(Shanghai Jiao Tong University), Shiyong Wu(Yalong Hydro (China)), Mengjiao Xiao(Peking University), Pengwei Xie(Shanghai Jiao Tong University), Binbin Yan(Shandong University), Yong Yang(Shanghai Jiao Tong University), Jianfeng Yue(Yalong Hydro (China)), Dan Zhang(Shanghai Jiao Tong University), HongGuang Zhang(Shanghai Jiao Tong University), Tao Zhang(Shanghai Jiao Tong University), Tianqi Zhang(Shanghai Jiao Tong University), Li Zhao(Shanghai Jiao Tong University), Jifang Zhou(Yalong Hydro (China)), Ning Zhou(Shanghai Jiao Tong University), Xiaopeng Zhou(Peking University)
Physical Review Letters
October 30, 2017
10.1103/physrevlett.119.181302
Cited by 904Open Access
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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}.

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