Dark matter direct search sensitivity of the PandaX-4T experiment
physics.ins-det
/ Authors
Hongguang Zhang, Abdusalam Abdukerim, Xun Chen, Yunhua Chen, Xiangyi Cui, Binbin Dong, Deqing Fang, Changbo Fu, Karl Giboni, Franco Giuliani
and 50 more authors
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,
/ Abstract
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}.