1. Study of background from accidental coincidence signals in the PandaX-II experiment
- Author
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Collaboration, PandaX-II, Abdukerim, Abdusalam, Chen, Wei, Chen, Xun, Chen, Yunhua, Cheng, Chen, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Fu, Mengting, Geng, Lisheng, Giboni, Karl, Gu, Linhui, Guo, Xuyuan, Han, Ke, He, Changda, Huang, Di, Huang, Yan, Huang, Yanlin, Huang, Zhou, Ji, Xiangdong, Ju, Yonglin, Li, Shuaijie, Liu, Huaxuan, Liu, Jianglai, Ma, Wenbo, Ma, Yugang, Mao, Yajun, Meng, Yue, Ni, Kaixiang, Ning, Jinhua, Ning, Xuyang, Ren, Xiangxiang, Shang, Changsong, Si, Lin, Shen, Guofang, Tan, Andi, Wang, Anqing, Wang, Hongwei, Wang, Meng, Wang, Qiuhong, Wang, Siguang, Wang, Wei, Wang, Xiuli, Wang, Zhou, Wu, Mengmeng, Wu, Shiyong, Wu, Weihao, Xia, Jingkai, Xiao, Mengjiao, Xie, Pengwei, Yan, Binbin, Yang, Jijun, Yang, Yong, Yu, Chunxu, Yuan, Jumin, Yuan, Ying, Zeng, Xinning, Zhang, Dan, Zhang, Tao, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, and Zhou, Xiaopeng
- Subjects
High Energy Physics - Experiment ,Physics - Data Analysis, Statistics and Probability ,Physics - Instrumentation and Detectors - Abstract
The PandaX-II experiment employed a 580kg liquid xenon detector to search for the interactions between dark matter particles and the target xenon atoms. The accidental coincidences of isolated signals result in a dangerous background which mimic the signature of the dark matter. We performed a detailed study on the accidental coincidence background in PandaX-II, including the possible origin of the isolated signals, the background level and corresponding background suppression method. With a boosted-decision-tree algorithm, the accidental coincidence background is reduced by 70% in the dark matter signal region, thus the sensitivity of dark matter search at PandaX-II is improved., Comment: 20 pages, 12 figures in main text and 5 figures in the appendix. Accepted by Chinese Physics C
- Published
- 2022
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