pandax-II实验中意外重合信号的背景研究

论文标题

pandax-II实验中意外重合信号的背景研究

Study of background from accidental coincidence signals in the PandaX-II experiment

论文作者

II Collaboration, 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

论文摘要

Pandax-II实验采用580kg液体氙气检测器来搜索暗物质颗粒与靶氙原子之间的相互作用。孤立信号的意外巧合导致危险的背景模仿暗物质的标志。我们对pandax-II的意外重合背景进行了详细研究，包括隔离信号的可能起源，背景级别和相应的背景抑制方法。通过增强decision-tree算法，在暗物质信号区域中，意外巧合的背景减少了70％，因此，在Pandax-II上搜索暗物质的敏感性得到了改善。

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.

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