학술논문
Study of background from accidental coincidence signals in the PandaX-II experiment
Document Type
Working Paper
Author
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; Zhou, Xiaopeng
Source
Subject
Language
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
Comment: 20 pages, 12 figures in main text and 5 figures in the appendix. Accepted by Chinese Physics C