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Dark matter direct search sensitivity of the PandaX-4T experiment

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arxiv 1806.02229 v2 pith:F6KQXHPN submitted 2018-06-06 physics.ins-det

Dark matter direct search sensitivity of the PandaX-4T experiment

Hongguang Zhang , Abdusalam Abdukerim , Xun Chen , Yunhua Chen , Xiangyi Cui , Binbin Dong , Deqing Fang , Changbo Fu
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Karl Giboni Franco Giuliani Linhui Gu Xuyuan Guo Zhifan Guo Ke Han Changda He Shengming He Di Huang Xingtao Huang Zhou Huang Peng Ji Xiangdong Ji Yonglin Ju Shaoli Li Yao Li Heng Lin Huaxuan Liu Jianglai Liu Yugang Ma Yajun Mao Kaixiang Ni Jinhua Ning Xiangxiang Ren Fang Shi Andi Tan Anqing Wang Cheng Wang Hongwei Wang Meng Wang Qiuhong Wang Siguang Wang Xiuli Wang Xuming Wang Zhou Wang Mengmeng Wu Shiyong Wu Jingkai Xia Mengjiao Xiao Pengwei Xie Binbin Yan Jijun Yang Yong Yang Chunxu Yu Jumin Yuan Jianfeng Yue Dan Zhang Tao Zhang Li Zhao Jifang Zhou Ning Zhou Xiaopeng Zhou
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classification physics.ins-det
keywords darkexperimentbackgroundmatterpandax-4tdirectelectronmass
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The PandaX-4T experiment, a four-ton scale dark matter direct detection experiment, is being planned at the China Jinping Underground Laboratory. In this paper we present a simulation study of the expected background in this experiment. In a 2.8-ton fiducial mass and the signal region between 1 to 10 keV electron equivalent energy, the total electron recoil background is found to be 4.9x10^{-5} /(kg day keV). The nuclear recoil background in the same region is 2.8x10^{-7}/(kg day keV). With an exposure of 5.6 ton-years, the sensitivity of PandaX-4T could reach a minimum spin-independent dark matter-nucleon cross section of 6x10^{-48} cm^{2} at a dark matter mass of 40 GeV/c^{2}.

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