Projected WIMP sensitivity of the CDEX-50 dark matter experiment
X. P. Geng, L. T. Yang, Q. Yue, K. Kang, Y. J. Li, Haipeng An, C. Greeshma, Jung Chang, Y.H. Chen, Jianping Cheng, Wei Dai, Z. Deng, C. H. Fang, H. Gong, Qiuju Guo, T. Guo, Xiangbo Guo, Long He, Shiqi He, J. Hu, Han‐Xiong Huang, Tiancheng Huang, Lin Jiang, S. Karmakar, H.B. Li, H.Y. Li, J.M. Li, J. Li, Q. Y. Li, R. M. J. Li, Xinqiao Li, Y. L. Li, Y. F. Liang, Bin Liao, F. K. Lin, S. T. Lin, Jianxin Liu, S.K. Liu, Y.D. Liu, Y. Liu, Yinna LIU, Hao Ma, Yunlong Mao, Qiuyue Nie, Jing Ning, H. Pan, Ningchun Qi, Jie Ren, Xichao Ruan, M. K. Singh, Tao Sun, C. J. Tang, Yang Tian, G.F. Wang, Jianzhong Wang, Lingling Wang, Qing Wang, Y. F. Wang, Y.X. Wang, H. T. Wong, Yongcheng Wu, Y. C. Wu, H. Y. Xing, R. Xu, Y. Xu, T. Xue, Yi‐Lin Yan, Yi Nan, C. X. Yu, H. J. Yu, J. F. Yue, M. Zeng, Zhi Zeng, B.T. Zhang, F. S. Zhang, L. Zhang, Z.H. Zhang, Zhiyong Zhang, J. Z. Zhao, K. Zhao, M. G. Zhao, Jifang Zhou, Z. Zhou, J. J. Zhu
Abstract
Abstract CDEX-50 is a next-generation project of the China Dark Matter Experiment (CDEX) that aims to search for dark matter using a 50-kg germanium detector array. This paper comprises a thorough summary of the CDEX-50 dark matter experiment, including an investigation of potential background sources and the development of a background model. Based on the baseline model, the projected sensitivity of weakly interacting massive particle (WIMP) is also presented. The expected background level within the energy region of interest, set to 2–2.5 keVee, is ∼0.01 counts keVee -1 kg -1 day -1 . At 90% confidence level, the expected sensitivity to spin-independent WIMP-nucleon couplings is estimated to reach a cross-section of 5.1 × 10 -45 cm 2 for a WIMP mass of 5 GeV/c 2 with an exposure objective of 150 kg·year and an analysis threshold of 160 eVee. This science goal will correspond to the most sensitive results for WIMPs with a mass of 2.2–8 GeV/c 2 .