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}.
@article{arxiv.1806.02229,
title = {Dark matter direct search sensitivity of the PandaX-4T experiment},
author = {Hongguang Zhang and Abdusalam Abdukerim and Xun Chen and Yunhua Chen and Xiangyi Cui and Binbin Dong and Deqing Fang and Changbo Fu and Karl Giboni and Franco Giuliani and Linhui Gu and Xuyuan Guo and Zhifan Guo and Ke Han and Changda He and Shengming He and Di Huang and Xingtao Huang and Zhou Huang and Peng Ji and Xiangdong Ji and Yonglin Ju and Shaoli Li and Yao Li and Heng Lin and Huaxuan Liu and Jianglai Liu and Yugang Ma and Yajun Mao and Kaixiang Ni and Jinhua Ning and Xiangxiang Ren and Fang Shi and Andi Tan and Anqing Wang and Cheng Wang and Hongwei Wang and Meng Wang and Qiuhong Wang and Siguang Wang and Xiuli Wang and Xuming Wang and Zhou Wang and Mengmeng Wu and Shiyong Wu and Jingkai Xia and Mengjiao Xiao and Pengwei Xie and Binbin Yan and Jijun Yang and Yong Yang and Chunxu Yu and Jumin Yuan and Jianfeng Yue and Dan Zhang and Tao Zhang and Li Zhao and Jifang Zhou and Ning Zhou and Xiaopeng Zhou},
journal= {arXiv preprint arXiv:1806.02229},
year = {2019}
}