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

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arxiv 2204.11175 v2 pith:NBSOZQRM submitted 2022-04-24 hep-ex physics.data-anphysics.ins-det

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

PandaX-II Collaboration: Abdusalam Abdukerim , Wei Chen , Xun Chen , Yunhua Chen , Chen Cheng , Xiangyi Cui , Yingjie Fan , Deqing Fang
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Changbo Fu Mengting Fu Lisheng Geng Karl Giboni Linhui Gu Xuyuan Guo Ke Han Changda He Di Huang Yan Huang Yanlin Huang Zhou Huang Xiangdong Ji Yonglin Ju Shuaijie Li Huaxuan Liu Jianglai Liu Wenbo Ma Yugang Ma Yajun Mao Yue Meng Kaixiang Ni Jinhua Ning Xuyang Ning Xiangxiang Ren Changsong Shang Lin Si Guofang Shen Andi Tan Anqing Wang Hongwei Wang Meng Wang Qiuhong Wang Siguang Wang Wei Wang Xiuli Wang Zhou Wang Mengmeng Wu Shiyong Wu Weihao Wu Jingkai Xia Mengjiao Xiao Pengwei Xie Binbin Yan Jijun Yang Yong Yang Chunxu Yu Jumin Yuan Ying Yuan Xinning Zeng Dan Zhang Tao Zhang Li Zhao Qibin Zheng Jifang Zhou Ning Zhou Xiaopeng Zhou
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classification hep-ex physics.data-anphysics.ins-det
keywords backgroundaccidentaldarkmatterpandax-iicoincidencesignalsexperiment
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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