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1. PandaX-xT—A deep underground multi-ten-tonne liquid xenon observatory

Author

Abdukerim, Abdusalam, Bo, Zihao, Chen, Wei, Chen, Xun, Cheng, Chen, Cheng, Zhaokan, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Geng, Lisheng, Giboni, Karl, Gu, Linhui, Guo, Xunan, Guo, Xuyuan, Guo, Zhichao, Han, Chencheng, Han, Ke, He, Changda, He, Jinrong, Huang, Di, Huang, Junting, Huang, Zhou, Hou, Ruquan, Hou, Yu, Ji, Xiangdong, Ju, Yonglin, Li, Chenxiang, Li, Jiafu, Li, Mingchuan, Li, Shuaijie, Li, Tao, Lin, Qing, Liu, Jianglai, Lu, Congcong, Lu, Xiaoying, Luo, Lingyin, Luo, Yunyang, Ma, Wenbo, Ma, Yugang, Mao, Yajun, Meng, Yue, Ning, Xuyang, Pang, Binyu, Qi, Ningchun, Qian, Zhicheng, Ren, Xiangxiang, Shaheed, Nasir, Shang, Xiaofeng, Shao, Xiyuan, Shen, Guofang, Si, Lin, Sun, Wenliang, Tao, Yi, Wang, Anqing, Wang, Meng, Wang, Qiuhong, Wang, Shaobo, Wang, Siguang, Wang, Wei, Wang, Xiuli, Wang, Xu, Wang, Zhou, Wei, Yuehuan, Wu, Mengmeng, Wu, Weihao, Wu, Yuan, Xiao, Mengjiao, Xiao, Xiang, Yan, Binbin, Yan, Xiyu, Yang, Yong, Yu, Chunxu, Yuan, Ying, Yuan, Zhe, Yun, Youhui, Zeng, Xinning, Zhang, Minzhen, Zhang, Peng, Zhang, Shibo, Zhang, Shu, Zhang, Tao, Zhang, Wei, Zhang, Yang, Zhang, Yingxin, Zhang, Yuanyuan, Zhao, Li, Zhou, Jifang, Zhou, Ning, Zhou, Xiaopeng, Zhou, Yong, Zhou, Yubo, and Zhou, Zhizhen

Published
2025
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2. Low radioactive material screening and background control for the PandaX-4T experiment

Author

Qian, Zhicheng, Si, Lin, Abdukerim, Abdusalam, Bo, Zihao, Chen, Wei, Chen, Xun, Chen, Yunhua, Cheng, Chen, Cheng, Yunshan, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Fu, Mengting, Geng, Lisheng, Giboni, Karl, Gu, Linhui, Guo, Xuyuan, Han, Ke, He, Changda, He, Jinrong, Huang, Di, Huang, Yanlin, Huang, Zhou, Hou, Ruquan, Ji, Xiangdong, Ju, Yonglin, Li, Chenxiang, Li, Mingchuan, Li, Shu, Li, Shuaijie, Lin, Qing, Liu, Jianglai, Lu, Xiaoying, Luo, Lingyin, Ma, Wenbo, Ma, Yugang, Mao, Yajun, Meng, Yue, Ning, Xuyang, Qi, Ningchun, Ren, Xiangxiang, Shaheed, Nasir, Shang, Changsong, Shen, Guofang, Sun, Wenliang, Tan, Andi, Tao, Yi, Wang, Anqing, Wang, Meng, Wang, Qiuhong, Wang, Shaobo, Wang, Siguang, Wang, Wei, Wang, Xiuli, Wang, Zhou, Wu, Mengmeng, Wu, Weihao, Xia, Jingkai, Xiao, Mengjiao, Xiao, Xiang, Xie, Pengwei, Yan, Binbin, Yan, Xiyu, Yang, Jijun, Yang, Yong, Yu, Chunxu, Yuan, Jumin, Yuan, Ying, Zhang, Dan, Zhang, Minzhen, Zhang, Peng, Zhang, Tao, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, Zhou, Xiaopeng, and Zhou, Yong

Published
2022
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3. Constraining self-interacting dark matter with the full dataset of PandaX-II

Author

Yang, Jijun, 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, He, Shengming, Huang, Di, Huang, Yan, Huo, Ran, Huang, Yanlin, Huang, Zhou, Ji, Xiangdong, Ju, Yonglin, Li, Shuaijie, Lin, Qing, Liu, Huaxuan, Liu, Jianglai, Lu, Xiaoying, Ma, Wenbo, Ma, Yugang, Mao, Yajun, Meng, Yue, Shaheed, Nasir, Ni, Kaixiang, Ning, Jinhua, Ning, Xuyang, Ren, Xiangxiang, Shang, Changsong, Shen, Guofang, Si, Lin, 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, Xiao, Xiang, Xie, Pengwei, Yan, Binbin, Yang, Yong, Yu, Chunxu, Yu, Hai-Bo, Yuan, Jumin, Yuan, Ying, Zeng, Xinning, Zhang, Dan, Zhang, Tao, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, and Zhou, Xiaopeng

Published
2021
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4. Search for Solar <math><mrow><mmultiscripts><mrow><mi>B</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>8</mn></mrow></mmultiscripts></mrow></math> Neutrinos in the PandaX-4T Experiment Using Neutrino-Nucleus Coherent Scattering

Author

Ma, Wenbo, Abdukerim, Abdusalam, Cheng, Chen, Bo, Zihao, Chen, Wei, Chen, Xun, Chen, Yunhua, Cheng, Zhaokan, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Fu, Mengting, Geng, Lisheng, Giboni, Karl, Gu, Linhui, Guo, Xuyuan, Han, Chencheng, Han, Ke, He, Changda, He, Jinrong, Huang, Di, Huang, Yanlin, Huang, Zhou, Hou, Ruquan, Ji, Xiangdong, Ju, Yonglin, Li, Chenxiang, Li, Jiafu, Li, Mingchuan, Li, Shu, Li, Shuaijie, Lin, Qing, Liu, Jianglai, Lu, Xiaoying, Luo, Lingyin, Luo, Yunyang, Ma, Yugang, Mao, Yajun, Shaheed, Nasir, Meng, Yue, Ning, Xuyang, Qi, Ningchun, Qian, Zhicheng, Ren, Xiangxiang, Shang, Changsong, Shang, Xiaofeng, Shen, Guofang, Si, Lin, Sun, Wenliang, Tan, Andi, Tao, Yi, Wang, Anqing, Wang, Meng, Wang, Qiuhong, Wang, Shaobo, Wang, Siguang, Wang, Wei, Wang, Xiuli, Wang, Zhou, Wei, Yuehuan, Wu, Mengmeng, Wu, Weihao, Xia, Jingkai, Xiao, Mengjiao, Xiao, Xiang, Xie, Pengwei, Yan, Binbin, Yan, Xiyu, Yang, Jijun, Yang, Yong, Yu, Chunxu, Yuan, Jumin, Yuan, Ying, Yuan, Zhe, Zeng, Xinning, Zhang, Dan, Zhang, Minzhen, Zhang, Peng, Zhang, Shibo, Zhang, Shu, Zhang, Tao, Zhang, Yingxin, Zhang, Yuanyuan, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, Zhou, Xiaopeng, Zhou, Yong, and Zhou, Yubo

Abstract

A search for interactions from solar B8 neutrinos elastically scattering off xenon nuclei using PandaX-4T commissioning data is reported. The energy threshold of this search is further lowered compared with the previous search for dark matter, with various techniques utilized to suppress the background that emerges from data with the lowered threshold. A blind analysis is performed on the data with an effective exposure of 0.48 tonne year, and no significant excess of events is observed. Among the results obtained using the neutrino-nucleus coherent scattering, our results give the best constraint on the solar B8 neutrino flux. We further provide a more stringent limit on the cross section between dark matter and nucleon in the mass range from 3 to 9 GeV/c2.

Published
2023

5. Search for light dark matter from atmosphere in PandaX-4T

Author

Ning, Xuyang, Abdukerim, Abdusalam, Bo, Zihao, Chen, Wei, Chen, Xun, Chen, Yunhua, Cheng, Chen, Cheng, Zhaokan, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Fu, Mengting, Geng, Lisheng, Giboni, Karl, Gu, Linhui, Guo, Xuyuan, Han, Chencheng, Han, Ke, He, Changda, He, Jinrong, Huang, Di, Huang, Yanlin, Huang, Zhou, Hou, Ruquan, Ji, Xiangdong, Ju, Yonglin, Li, Chenxiang, Li, Jiafu, Li, Mingchuan, Li, Shu, Li, Shuaijie, Lin, Qing, Liu, Jianglai, Lu, Xiaoying, Luo, Lingyin, Luo, Yunyang, Ma, Wenbo, Ma, Yugang, Mao, Yajun, Meng, Yue, Qi, Ningchun, Qian, Zhicheng, Ren, Xiangxiang, Shaheed, Nasir, Shang, Changsong, Shang, Xiaofeng, Shen, Guofang, Si, Lin, Sun, Wenliang, Tan, Andi, Tao, Yi, Wang, Anqing, Wang, Meng, Wang, Qiuhong, Wang, Shaobo, Wang, Siguang, Wang, Wei, Wang, Xiuli, Wang, Zhou, Wei, Yuehuan, Wu, Mengmeng, Wu, Weihao, Xia, Jingkai, Xiao, Mengjiao, Xiao, Xiang, Xie, Pengwei, Yan, Binbin, Yan, Xiyu, Yang, Jijun, Yang, Yong, Yao, Yukun, Yu, Chunxu, Yuan, Jumin, Yuan, Ying, Yuan, Zhe, Zeng, Xinning, Zhang, Dan, Zhang, Minzhen, Zhang, Peng, Zhang, Shibo, Zhang, Shu, Zhang, Tao, Zhang, Yang, Zhang, Yingxin, Zhang, Yuanyuan, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, Zhou, Xiaopeng, Zhou, Yong, Zhou, Yubo, Su, Liangliang, and lei wu

Subjects
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics - Experiment
Abstract

We report a search for light dark matter produced through the cascading decay of $\eta$ mesons, which are created as a result of inelastic collisions between cosmic rays and Earth's atmosphere. We introduce a new and general framework, publicly accessible, designed to address boosted dark matter specifically, with which a full and dedicated simulation including both elastic and quasi-elastic processes of Earth attenuation effect on the dark matter particles arriving at the detector is performed. In the PandaX-4T commissioning data of 0.63 tonne$\cdot$year exposure, no significant excess over background is observed. The first constraints on the interaction between light dark matter generated in the atmosphere and nucleus through a light scalar mediator are obtained. The lowest excluded cross-section is set at $5.9 \times 10^{-37}{\rm cm^2}$ for dark matter mass of $0.1$ MeV$/c^2$ and mediator mass of 300 MeV$/c^2$. The lowest upper limit of $\eta$ to dark matter decay branching ratio is $1.6 \times 10^{-7}$.

Published
2023

6. Neutron-induced nuclear recoil background in the PandaX-4T experiment

Author

Huang, Zhou, Shen, Guofang, Wang, Qiuhong, Abdukerim, Abdusalam, Bo, Zihao, Chen, Wei, Chen, Xun, Chen, Yunhua, Cheng, Chen, Cheng, Yunshan, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Fu, Mengting, Geng, Lisheng, Giboni, Karl, Gu, Linhui, Guo, Xuyuan, Han, Chencheng, Han, Ke, He, Changda, He, Jinrong, Huang, Di, Huang, Yanlin, Hou, Ruquan, Ji, Xiangdong, Ju, Yonglin, Li, Chenxiang, Li, Mingchuan, Li, Shu, Li, Shuaijie, Lin, Qing, Liu, Jianglai, Lu, Xiaoying, Luo, Lingyin, Ma, Wenbo, Ma, Yugang, Mao, Yajun, Meng, Yue, Ning, Xuyang, Qi, Ningchun, Qian, Zhicheng, Ren, Xiangxiang, Shaheed, Nasir, Shang, Changsong, Si, Lin, Sun, Wenliang, Tan, Andi, Tao, Yi, Wang, Anqing, Wang, Meng, Wang, Shaobo, Wang, Siguang, Wang, Wei, Wang, Xiuli, Wang, Zhou, Wu, Mengmeng, Wu, Weihao, Xia, Jingkai, Xiao, Mengjiao, Xiao, Xiang, Xie, Pengwei, Yan, Binbin, Yan, Xiyu, Yang, Jijun, Yang, Yong, Yu, Chunxu, Yuan, Jumin, Yuan, Ying, Zhang, Dan, Zhang, Minzhen, Zhang, Peng, Zhang, Tao, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, Zhou, Xiaopeng, Zhou, Yong, and (PandaX Collaboration)

Subjects
High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment, Instrumentation, High Energy Physics - Experiment
Abstract

Neutron-induced nuclear recoil background is critical to the dark matter searches in the PandaX-4T liquid xenon experiment. This paper studies the feature of neutron background in liquid xenon and evaluates their contribution in the single scattering nuclear recoil events through three methods. The first method is fully Monte Carlo simulation based. The last two are data-driven methods that also use the multiple scattering signals and high energy signals in the data, respectively. In the PandaX-4T commissioning data with an exposure of 0.63 tonne-year, all these methods give a consistent result that there are $1.15\pm0.57$ neutron-induced background in dark matter signal region within an approximated nuclear recoil energy window between 5 and 100 keV., 14 pages, 14 figures, 6 tables

Published
2022

7. Dark matter direct search sensitivity of the PandaX-4T experiment

Author

Zhang, HongGuang, Abdukerim, Abdusalam, Chen, Wei, Chen, Xun, Chen, YunHua, Cui, XiangYi, Dong, BinBin, Fang, DeQing, Fu, ChangBo, Giboni, Karl, Giuliani, Franco, Gu, LinHui, Guo, XuYuan, Guo, ZhiFan, Han, Ke, He, ChangDa, He, ShengMing, Huang, Di, Huang, XingTao, Huang, Zhou, Ji, Peng, Ji, XiangDong, Ju, YongLin, Li, ShaoLi, Li, Yao, Lin, Heng, Liu, HuaXuan, Liu, JiangLai, Ma, YuGang, Mao, YaJun, Ni, KaiXiang, Ning, JinHua, Ren, XiangXiang, Shi, Fang, Tan, AnDi, Wang, AnQing, Wang, Cheng, Wang, HongWei, Wang, Meng, Wang, QiuHong, Wang, SiGuang, Wang, XiuLi, Wang, XuMing, Wang, Zhou, Wu, MengMeng, Wu, ShiYong, Xia, JingKai, Xiao, MengJiao, Xie, PengWei, Yan, BinBin, Yang, JiJun, Yang, Yong, Yu, ChunXu, Yuan, JuMin, Yue, JianFeng, Zhang, Dan, Zhang, Tao, Zhao, Li, Zheng, QiBin, Zhou, JiFang, Zhou, Ning, and Zhou, XiaoPeng

Published
2018
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8. Constraints on the axial-vector and pseudo-scalar mediated WIMP-nucleus interactions from PandaX-4T experiment

Author

Huang, Zhou, Han, Chencheng, Abdukerim, Abdusalam, Bo, Zihao, Chen, Wei, Chen, Xun, Chen, Yunhua, Cheng, Chen, Cheng, Zhaokan, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Fu, Mengting, Geng, Lisheng, Giboni, Karl, Gu, Linhui, Guo, Xuyuan, Han, Ke, He, Changda, He, Jinrong, Huang, Di, Huang, Yanlin, Hou, Ruquan, Ji, Xiangdong, Ju, Yonglin, Li, Chenxiang, Li, Jiafu, Li, Mingchuan, Li, Shu, Li, Shuaijie, Lin, Qing, Liu, Jianglai, Lu, Xiaoying, Luo, Lingyin, Luo, Yunyang, Ma, Wenbo, Ma, Yugang, Mao, Yajun, Shaheed, Nasir, Meng, Yue, Ning, Xuyang, Qi, Ningchun, Qian, Zhicheng, Ren, Xiangxiang, Shang, Changsong, Shang, Xiaofeng, Shen, Guofang, Si, Lin, Sun, Wenliang, Tan, Andi, Tao, Yi, Wang, Anqing, Wang, Meng, Wang, Qiuhong, Wang, Shaobo, Wang, Siguang, Wang, Wei, Wang, Xiuli, Wang, Zhou, Wei, Yuehuan, Wu, Mengmeng, Wu, Weihao, Xia, Jingkai, Xiao, Mengjiao, Xiao, Xiang, Xie, Pengwei, Yan, Binbin, Yan, Xiyu, Yang, Jijun, Yang, Yong, Yu, Chunxu, Yuan, Jumin, Yuan, Ying, Yuan, Zhe, Zeng, Xinning, Zhang, Dan, Zhang, Minzhen, Zhang, Peng, Zhang, Shibo, Zhang, Shu, Zhang, Tao, Zhang, Yingxin, Zhang, Yuanyuan, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, Zhou, Xiaopeng, Zhou, Yong, and Zhou, Yubo

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, High Energy Physics - Phenomenology (hep-ph), FOS: Physical sciences, High Energy Physics - Experiment
Abstract

We present the constraints on the axial-vector and pseudo-scalar mediated WIMP-nucleus interactions from the PandaX-4T experiment, using the data set corresponding to a total exposure of 0.63 tonne⋅year. No significant signal excess is observed, and the most stringent constraints to date on the mediator mass are set for the axial-vector and pseudo-scalar simplified models. The maximum excluded mass of an axial-vector mediator is 825 GeV/c2 and that of a pseudo-scalar mediator is 106 GeV/c2. In addition, the upper limits on the spin-dependent WIMP-nucleon scattering cross-section for conventional neutron-only and proton-only interactions are derived.

Published
2022

9. Search for Light Fermionic Dark Matter Absorption on Electrons in PandaX-4T

Author

Zhang, Dan, Abdukerim, Abdusalam, Bo, Zihao, Chen, Wei, Chen, Xun, Chen, Yunhua, Cheng, Chen, Cheng, Zhaokan, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Fu, Mengting, Geng, Lisheng, Giboni, Karl, Gu, Linhui, Guo, Xuyuan, Han, Ke, He, Changda, He, Jinrong, Huang, Di, Huang, Yanlin, Huang, Zhou, Hou, Ruquan, Ji, Xiangdong, Ju, Yonglin, Li, Chenxiang, Li, Jiafu, Li, Mingchuan, Li, Shu, Li, Shuaijie, Lin, Qing, Liu, Jianglai, Lu, Xiaoying, Luo, Lingyin, Luo, Yunyang, Ma, Wenbo, Ma, Yugang, Mao, Yajun, Shaheed, Nasir, Meng, Yue, Ning, Xuyang, Qi, Ningchun, Qian, Zhicheng, Ren, Xiangxiang, Shang, Changsong, Shang, Xiaofeng, Shen, Guofang, Si, Lin, Sun, Wenliang, Tan, Andi, Tao, Yi, Wang, Anqing, Wang, Meng, Wang, Qiuhong, Wang, Shaobo, Wang, Siguang, Wang, Wei, Wang, Xiuli, Wang, Zhou, Wei, Yuehuan, Wu, Mengmeng, Wu, Weihao, Xia, Jingkai, Xiao, Mengjiao, Xiao, Xiang, Xie, Pengwei, Yan, Binbin, Yan, Xiyu, Yang, Jijun, Yang, Yong, Yu, Chunxu, Yuan, Jumin, Yuan, Ying, Zeng, Xinning, Zhang, Minzhen, Zhang, Peng, Zhang, Shibo, Zhang, Shu, Zhang, Tao, Zhang, Yuanyuan, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, Zhou, Xiaopeng, Zhou, Yong, Zhou, Yubo, Ge, Shao-Feng, He, Xiao-Gang, Ma, Xiao-Dong, and Sheng, Jie

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), High Energy Physics - Experiment (hep-ex), General Physics and Astronomy, FOS: Physical sciences, Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Experiment
Abstract

We report a search on sub-MeV fermionic dark matter absorbed by electrons with an outgoing active neutrino using the 0.63 tonne year exposure collected by the PandaX-4T liquid xenon experiment. No significant signals are observed over the expected background. The data are interpreted into limits to the effective couplings between such dark matter and the electron. For axial-vector or vector interactions, our sensitivity is competitive in comparison to existing astrophysical bounds on the decay of such a dark matter candidate into photon final states. In particular, we present the first direct detection limits for a vector (axial-vector) interaction which are the strongest in the mass range from 35 to 55 (25 to 45) keV/c2 in comparison to other astrophysical and cosmological constraints.

Published
2022

10. A First Search for Solar $^8$B Neutrino in the PandaX-4T Experiment using Neutrino-Nucleus Coherent Scattering

Author

Ma, Wenbo, Abdukerim, Abdusalam, Cheng, Chen, Bo, Zihao, Chen, Wei, Xun Chen, Chen, Yunhua, Cheng, Zhaokan, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Fu, Mengting, Geng, Lisheng, Giboni, Karl, Gu, Linhui, Guo, Xuyuan, Han, Chencheng, Han, Ke, He, Changda, He, Jinrong, Huang, Di, Huang, Yanlin, Huang, Zhou, Hou, Ruquan, Ji, Xiangdong, Ju, Yonglin, Li, Chenxiang, Li, Jiafu, Li, Mingchuan, Li, Shu, Li, Shuaijie, Lin, Qing, Liu, Jianglai, Lu, Xiaoying, Luo, Lingyin, Luo, Yunyang, Ma, Yugang, Mao, Yajun, Shaheed, Nasir, Meng, Yue, Ning, Xuyang, Qi, Ningchun, Qian, Zhicheng, Ren, Xiangxiang, Shang, Changsong, Shang, Xiaofeng, Shen, Guofang, Si, Lin, Sun, Wenliang, Tan, Andi, Tao, Yi, Wang, Anqing, Wang, Meng, Wang, Qiuhong, Wang, Shaobo, Wang, Siguang, Wang, Wei, Wang, Xiuli, Wang, Zhou, Wei, Yuehuan, Wu, Mengmeng, Wu, Weihao, Xia, Jingkai, Xiao, Mengjiao, Xiao, Xiang, Xie, Pengwei, Yan, Binbin, Yan, Xiyu, Yang, Jijun, Yang, Yong, Yu, Chunxu, Yuan, Jumin, Yuan, Ying, Yuan, Zhe, Zeng, Xinning, Zhang, Dan, Zhang, Minzhen, Zhang, Peng, Zhang, Shibo, Zhang, Shu, Zhang, Tao, Zhang, Yingxin, Zhang, Yuanyuan, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, Zhou, Xiaopeng, Zhou, Yong, and Zhou, Yubo

Subjects
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, Nuclear Experiment, High Energy Physics - Experiment
Abstract

A search for interactions from solar $^8$B neutrinos elastically scattering off xenon nuclei using PandaX-4T commissioning data is reported. The energy threshold of this search is further lowered compared with the previous search for dark matter, with various techniques utilized to suppress the background that emerges from data with the lowered threshold. A blind analysis is performed on the data with an effective exposure of 0.48 tonne$\cdot$year, and no significant excess of events is observed. Among results obtained using the neutrino-nucleus coherent scattering, our results give the best constraint on the solar $^8$B neutrino flux. We further provide a more stringent limit on the cross section between dark matter and nucleon in the mass range from 3 to 9 GeV/c$^2$., 5 pages, 4 figures

Published
2022

11. Measurement of Double Beta Decay Half-life of $^{136}$Xe with the PandaX-4T Detector

Author

PandaX Collaboration, Si, Lin, Cheng, Zhaokan, Abdukerim, Abdusalam, Bo, Zihao, Chen, Wei, Chen, Xun, Chen, Yunhua, Cheng, Chen, Cheng, Yunshan, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Fu, Mengting, Geng, Lisheng, Giboni, Karl, Gu, Linhui, Guo, Xuyuan, Han, Ke, He, Changda, He, Jinrong, Huang, Di, Huang, Yanlin, Huang, Zhou, Hou, Ruquan, Ji, Xiangdong, Ju, Yonglin, Li, Chenxiang, Li, Jiafu, Li, Mingchuan, Li, Shu, Li, Shuaijie, Lin, Qing, Liu, Jianglai, Lu, Xiaoying, Luo, Lingyin, Luo, Yunyang, Ma, Wenbo, Ma, Yugang, Mao, Yajun, Meng, Yue, Shaheed, Nasir, Shang, Xiaofeng, Ning, Xuyang, Qi, Ningchun, Qian, Zhicheng, Ren, Xiangxiang, Shang, Changsong, Shen, Guofang, Sun, Wenliang, Tan, Andi, Tao, Yi, Wang, Anqing, Wang, Meng, Wang, Qiuhong, Wang, Shaobo, Wang, Siguang, Wang, Wei, Wang, Xiuli, Wang, Zhou, Wei, Yuehuan, Wu, Mengmeng, Wu, Weihao, Xia, Jingkai, Xiao, Mengjiao, Xiao, Xiang, Xie, Pengwei, Yan, Binbin, Yan, Xiyu, Yang, Jijun, Yang, Yong, Yu, Chunxu, Yuan, Jumin, Yuan, Ying, Yuan, Zhe, Zhang, Dan, Zhang, Minzhen, Zhang, Peng, Zhang, Shibo, Zhang, Shu, Zhang, Tao, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, Zhou, Xiaopeng, and Zhou, Yong

Subjects
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment
Abstract

Precise measurement of two-neutrino double beta decay (DBD) half-life is an important step for the searches of Majorana neutrinos with neutrinoless double beta decay. We report the measurement of DBD half-life of $^{136}$Xe using the PandaX-4T dual-phase Time Projection Chamber (TPC) with 3.7-tonne natural xenon and the first 94.9-day physics data release. The background model in the fiducial volume is well constrained in situ by events in the outer active region. With a $^{136}$Xe exposure of 15.5 kg-year, we establish the half-life as $2.27 \pm 0.03 (stat.)\pm 0.10 (syst.)\times 10^{21}$ years. This is the first DBD half-life measurement with natural xenon and demonstrates the physics capability of a large-scale liquid xenon TPC in the field of rare event searches., 6 pages, 4 figures

Published
2022

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

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, and Zhou, Xiaopeng

Subjects
Nuclear and High Energy Physics, High Energy Physics - Experiment (hep-ex), Physics - Instrumentation and Detectors, Physics - Data Analysis, Statistics and Probability, FOS: Physical sciences, Astronomy and Astrophysics, Instrumentation and Detectors (physics.ins-det), Instrumentation, Data Analysis, Statistics and Probability (physics.data-an), High Energy Physics - Experiment
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., 20 pages, 12 figures in main text and 5 figures in the appendix. Accepted by Chinese Physics C

Published
2022

14. Searching for neutrino-less double beta decay of 136Xe with PandaX-II liquid xenon detector Supported by grants from the Ministry of Science and Technology of China (2016YFA0400301, 2016YFA0400302), a Double Top-class grant from Shanghai Jiao Tong University, grants from National Science Foundation of China (11435008, 11505112, 11525522, 11775142, 11755001), grants from the Office of Science and Technology, Shanghai Municipal Government (11DZ2260700, 16DZ2260200, 18JC1410200), and the support from the Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education. This work is supported in part by the Chinese Academy of Sciences Center for Excellence in Particle Physics (CCEPP) and Hongwen Foundation in Hong Kong

Author

Ni, Kaixiang, Lai, Yihui, Abdukerim, Abdusalam, Chen, Wei, Chen, Xun, Chen, Yunhua, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Geng, Lisheng, Giboni, Karl, Giuliani, Franco, Gu, Linhui, Guo, Xuyuan, Han, Ke, He, Changda, Huang, Di, Huang, Yan, Huang, Yanlin, Huang, Zhou, Ji, Peng, Ji, Xiangdong, Ju, Yonglin, Liang, Kun, Liu, Huaxuan, Liu, Jianglai, Ma, Wenbo, Ma, Yugang, Mao, Yajun, Meng, Yue, Namwongsa, Parinya, Ning, Jinhua, Ning, Xuyang, Ren, Xiangxiang, Shang, Changsong, Si, Lin, Tan, Andi, Wang, Anqing, Wang, Hongwei, Wang, Meng, Wang, Qiuhong, Wang, Siguang, Wang, Xiuli, Wang, Zhou, Wu, Mengmeng, Wu, Shiyong, Xia, Jingkai, Xiao, Mengjiao, Xie, Pengwei, Yan, Binbin, Yang, Jijun, Yang, Yong, Yu, Chunxu, Yuan, Jumin, Zhang, Dan, Zhang, Hongguang, Zhang, Tao, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, and Zhou, Xiaopeng

Abstract

We report the Neutrino-less Double Beta Decay (NLDBD) search results from PandaX-II dual-phase liquid xenon time projection chamber. The total live time used in this analysis is 403.1 days from June 2016 to August 2018. With NLDBD-optimized event selection criteria, we obtain a fiducial mass of 219 kg of natural xenon. The accumulated xenon exposure is 242 kg·yr, or equivalently 22.2 kg·yr of 136Xe exposure. At the region around 136Xe decay Q-value of 2458 keV, the energy resolution of PandaX-II is 4.2%. We find no evidence of NLDBD in PandaX-II and establish a lower limit for decay half-life of 2.1 yr at the 90% confidence level, which corresponds to an effective Majorana neutrino mass eV. This is the first NLDBD result reported from a dual-phase xenon experiment.

Published
2019

15. An Improved Evaluation of the Neutron Background in the PandaX-II Experiment

Author

Wang, Qiuhong, Abdukerim, Abdusalam, Chen, Wei, Chen, Xun, Chen, Yunhua, Cui, Xiangyi, Fan, Yingjie, Fang, Deqing, Fu, Changbo, Geng, Lisheng, Giboni, Karl, Giuliani, Franco, Gu, Linhui, Guo, Xuyuan, Han, Ke, He, Changda, Huang, Di, Huang, Yan, Huang, Yanlin, Huang, Zhou, Ji, Peng, Ji, Xiangdong, Ju, Yonglin, Lai, Yihui, Liang, Kun, Liu, Huaxuan, Liu, Jianglai, Ma, Wenbo, Ma, Yugang, Mao, Yajun, Meng, Yue, Namwongsa, Parinya, Ni, Kaixiang, Ning, Jinhua, Ning, Xuyang, Ren, Xiangxiang, Shang, Changsong, Si, Lin, Tan, Andi, Wang, Anqing, Wang, Hongwei, Wang, Meng, Wang, Siguang, Wang, Xiuli, Wang, Zhou, Wu, Mengmeng, Wu, Shiyong, Xia, Jingkai, Xiao, Mengjiao, Xie, Pengwei, Yan, Binbin, Yang, Jijun, Yang, Yong, Yu, Chunxu, Yuan, Jumin, Zhang, Dan, Zhang, Hongguang, Zhang, Tao, Zhao, Li, Zheng, Qibin, Zhou, Jifang, Zhou, Ning, and Zhou, Xiaopeng

Subjects
High Energy Physics - Experiment (hep-ex), Physics - Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment
Abstract

In dark matter direct detection experiments, neutron is a serious source of background, which can mimic the dark matter-nucleus scattering signals. In this paper, we present an improved evaluation of the neutron background in the PandaX-II dark matter experiment by a novel approach. Instead of fully relying on the Monte Carlo simulation, the overall neutron background is determined from the neutron-induced high energy signals in the data. In addition, the probability of producing a dark-matter-like background per neutron is evaluated with a complete Monte Carlo generator, where the correlated emission of neutron(s) and $\gamma$(s) in the ($\alpha$, n) reactions and spontaneous fissions is taken into consideration. With this method, the neutron backgrounds in the Run 9 (26-ton-day) and Run 10 (28-ton-day) data sets of PandaX-II are estimated to be 0.66$\pm$0.24 and 0.47$\pm$0.25 events, respectively., Comment: 9 pages, 9 figures, 7 tables; version2 accepted by Sci. China Phys. Mech. Astron

Published
2019

19. Dark matter direct search sensitivity of the PandaX-4T experiment.

Author

Zhang, HongGuang, Abdukerim, Abdusalam, Chen, Wei, Chen, Xun, Chen, YunHua, Cui, XiangYi, Dong, BinBin, Fang, DeQing, Fu, ChangBo, Giboni, Karl, Giuliani, Franco, Gu, LinHui, Guo, XuYuan, Guo, ZhiFan, Han, Ke, He, ChangDa, He, ShengMing, Huang, Di, Huang, XingTao, and Huang, Zhou

Abstract

The PandaX-4T experiment, a 4-ton scale dark matter direct detection experiment, is being planned at the China Jinping Un- derground Laboratory. In this paper we present a simulation study of the expected background in this experiment. In a 2.8-ton fiducial mass and the signal region between 1-10 keV electron equivalent energy, the total electron recoil background is found to be 4:9 × 10−5 kg−1d−1keV−1. The nuclear recoil background in the same region is 2:8 × 10−7 kg−1d−1keV−1. With an exposure of 5.6 ton-years, the sensitivity of PandaX-4T could reach a minimum spin-independent dark matter-nucleon cross section of 6 × 10−48 cm2 at a dark matter mass of 40 GeV/c2. [ABSTRACT FROM AUTHOR]

Published
2019
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20. PandaX-II constraints on spin-dependent WIMP-nucleon effective interactions.

Author

Xia, Jingkai, Abdukerim, Abdusalam, Chen, Wei, Chen, Xun, Chen, Yunhua, Cui, Xiangyi, Fang, Deqing, Fu, Changbo, Giboni, Karl, Giuliani, Franco, Gu, Linhui, Guo, Xuyuan, Guo, Zhifan, Han, Ke, He, Changda, He, Shengming, Huang, Di, Huang, Xingtao, Huang, Zhou, and Ji, Peng

Subjects
*ELECTRIC dipole moments, *MAGNETIC dipole moments, *WEAKLY interacting massive particles, *NUCLEON-nucleon interactions
Abstract

We present PandaX-II constraints on candidate WIMP-nucleon effective interactions involving the nucleon or WIMP spin, including, in addition to standard axial spin-dependent (SD) scattering, various couplings among vector and axial currents, magnetic and electric dipole moments, and tensor interactions. The data set corresponding to a total exposure of 54-ton-days is reanalyzed to determine constraints as a function of the WIMP mass and isospin coupling. We obtain WIMP-nucleon cross section bounds of 1.6 × 10 − 41 cm 2 and 9.0 × 10 − 42 cm 2 (90% c.l.) for neutron-only SD and tensor coupling, respectively, for a mass M WIMP ∼ 40 GeV / c 2. The SD limits are the best currently available for M WIMP > 40 GeV / c 2. We show that PandaX-II has reached a sensitivity sufficient to probe a variety of other candidate spin-dependent interactions at the weak scale. [ABSTRACT FROM AUTHOR]

Published
2019
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21. A search for two-component Majorana dark matter in a simplified model using the full exposure data of PandaX-II experiment.

Author

Yuan, Ying, Abdukerim, Abdusalam, Bo, Zihao, 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, He, Jinrong, and Huang, Di

Subjects
*DARK matter, *SIGNAL detection, *SIGNAL processing, *WEAKLY interacting massive particles, *SCATTERING (Physics), *BOSONS
Abstract

In the two-component Majorana dark matter model, one dark matter particle can scatter off the target nuclei, and turn into a slightly heavier component. In the framework of a simplified model with a vector boson mediator, both the tree-level and loop-level processes contribute to the signal in direct detection experiment. In this paper, we report the search results for such dark matter from PandaX-II experiment, using total data of the full 100.7 tonne⋅day exposure. No significant excess is observed, so strong constraints on the combined parameter space of mediator mass and dark matter mass are derived. With the complementary search results from collider experiments, a large range of parameter space can be excluded. [ABSTRACT FROM AUTHOR]

Published
2022
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22. First Indication of Solar ^{8}B Neutrinos through Coherent Elastic Neutrino-Nucleus Scattering in PandaX-4T.

Author

Bo Z, Chen W, Chen X, Chen Y, Cheng Z, Cui X, Fan Y, Fang D, Gao Z, Geng L, Giboni K, Guo X, Guo X, Guo Z, Han C, Han K, He C, He J, Huang D, Huang H, Huang J, Hou R, Hou Y, Ji X, Ji X, Ju Y, Li C, Li J, Li M, Li S, Li T, Li Z, Lin Q, Liu J, Lu C, Lu X, Luo L, Luo Y, Ma W, Ma Y, Mao Y, Meng Y, Ning X, Pang B, Qi N, Qian Z, Ren X, Shan D, Shang X, Shao X, Shen G, Shen M, Sun W, Tao Y, Wang A, Wang G, Wang H, Wang J, Wang L, Wang M, Wang Q, Wang S, Wang S, Wang W, Wang X, Wang X, Wang Z, Wei Y, Wu W, Wu Y, Xiao M, Xiao X, Xiong K, Xu Y, Yao S, Yan B, Yan X, Yang Y, Ye P, Yu C, Yuan Y, Yuan Z, Yun Y, Zeng X, Zhang M, Zhang P, Zhang S, Zhang S, Zhang T, Zhang W, Zhang Y, Zhang Y, Zhang Y, Zhao L, Zhou J, Zhou J, Zhou J, Zhou N, Zhou X, Zhou Y, and Zhou Z

Abstract

The PandaX-4T liquid xenon detector at the China Jinping Underground Laboratory is used to measure the solar ^{8}B neutrino flux by detecting neutrinos through coherent scattering with xenon nuclei. Data samples requiring the coincidence of scintillation and ionization signals (paired), as well as unpaired ionization-only signals (US2), are selected with energy threshold of approximately 1.1 keV (0.33 keV) nuclear recoil energy. Combining the commissioning run and the first science run of PandaX-4T, a total exposure of 1.20 and 1.04  tonne·year are collected for the paired and US2, respectively. After unblinding, 3 and 332 events are observed with an expectation of 2.8±0.5 and 251±32 background events, for the paired and US2 data, respectively. A combined analysis yields a best-fit ^{8}B neutrino signal of 3.5 (75) events from the paired (US2) data sample, with ∼37% uncertainty, and the background-only hypothesis is disfavored at 2.64σ significance. This gives a solar ^{8}B neutrino flux of (8.4±3.1)×10^{6}  cm^{-2} s^{-1}, consistent with the standard solar model prediction. It is also the first indication of solar ^{8}B neutrino "fog" in a dark matter direct detection experiment.

Published
2024
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23. Search for Cosmic-Ray Boosted Sub-MeV Dark-Matter-Electron Scattering in PandaX-4T.

Author

Shang X, Abdukerim A, Bo Z, Chen W, Chen X, Chen Y, Cheng C, Cheng Z, Cui X, Fan Y, Fang D, Geng L, Giboni K, Guo X, Han C, Han K, He C, He J, Huang D, Huang J, Huang Z, Hou R, Hou Y, Ji X, Ji X, Ju Y, Li C, Li J, Li M, Li S, Li T, Lin Q, Liu J, Lu C, Lu X, Luo L, Luo Y, Ma W, Ma Y, Mao Y, Meng Y, Ning X, Pang B, Qi N, Qian Z, Ren X, Shaheed N, Shao X, Shen G, Shen M, Si L, Sun W, Tao Y, Wang A, Wang M, Wang Q, Wang S, Wang S, Wang W, Wang X, Wang X, Wang Z, Wei Y, Wu M, Wu W, Wu Y, Xiao M, Xiao X, Xiong K, Yan B, Yan X, Yang Y, Yu C, Yuan Y, Yuan Z, Yun Y, Zeng X, Zhang M, Zhang P, Zhang S, Zhang S, Zhang T, Zhang W, Zhang Y, Zhang Y, Zhang Y, Zhao L, Zhou J, Zhou N, Zhou X, Zhou Y, Zhou Z, Ge SF, and Xia C

Abstract

We report the first search for the elastic scatterings between cosmic-ray boosted sub-MeV dark matter (DM) and electrons in the PandaX-4T liquid xenon experiment. Sub-MeV DM particles can be accelerated by scattering with electrons in the cosmic rays and produce detectable electron recoil signals in the detector. Using the commissioning data from PandaX-4T of 0.63  tonne·year exposure, we set new constraints on DM-electron scattering cross sections for DM masses ranging from 10  eV/c^{2} to 3  keV/c^{2}.

Published
2024
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24. Searching for Two-Neutrino and Neutrinoless Double Beta Decay of ^{134}Xe with the PandaX-4T Experiment.

Author

Yan X, Cheng Z, Abdukerim A, Bo Z, Chen W, Chen X, Cheng C, Cui X, Fan Y, Fang D, Fu C, Fu M, Geng L, Giboni K, Gu L, Guo X, Han C, Han K, He C, He J, Huang D, Huang Y, Huang J, Huang Z, Hou R, Hou Y, Ji X, Ju Y, Li C, Li J, Li M, Li S, Li T, Lin Q, Liu J, Lu X, Lu C, Luo L, Luo Y, Ma W, Ma Y, Mao Y, Meng Y, Ning X, Pang B, Qi N, Qian Z, Ren X, Shaheed N, Shang X, Shao X, Shen G, Si L, Sun W, Tan A, Tao Y, Wang A, Wang M, Wang Q, Wang S, Wang S, Wang W, Wang X, Wang Z, Wei Y, Wu M, Wu W, Xia J, Xiao M, Xiao X, Xie P, Yan B, Yang J, Yang Y, Yao Y, Yu C, Yuan Y, Yuan Z, Zeng X, Zhang D, Zhang M, Zhang P, Zhang S, Zhang S, Zhang T, Zhang W, Zhang Y, Zhang Y, Zhang Y, Zhao L, Zheng Q, Zhou J, Zhou N, Zhou X, Zhou Y, and Zhou Y

Abstract

^{134}Xe is a candidate isotope for neutrinoless double beta decay (0νββ) search. In addition, the two-neutrino case (2νββ) allowed by the standard model of particle physics has not yet been observed. With the 656-kg natural xenon in the fiducial volume of the PandaX-4T detector, which contains 10.4% of ^{134}Xe, and its initial 94.9-day exposure, we have established the most stringent constraints on 2νββ and 0νββ of ^{134}Xe half-lives, with limits of 2.8×10^{22}  yr and 3.0×10^{23}  yr at 90% confidence level, respectively. The 2νββ (0νββ) limit surpasses the previously reported best result by a factor of 32 (2.7), highlighting the potential of large monolithic natural xenon detectors for double beta decay searches.

Published
2024
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25. Search for Dark-Matter-Nucleon Interactions with a Dark Mediator in PandaX-4T.

Author

Huang D, Abdukerim A, Bo Z, Chen W, Chen X, Cheng C, Cheng Z, Cui X, Fan Y, Fang D, Fu C, Fu M, Geng L, Giboni K, Gu L, Guo X, Han C, Han K, He C, He J, Huang Y, Huang J, Huang Z, Hou R, Hou Y, Ji X, Ju Y, Li C, Li J, Li M, Li S, Li T, Lin Q, Liu J, Lu C, Lu X, Luo L, Luo Y, Ma W, Ma Y, Mao Y, Meng Y, Ning X, Qi N, Qian Z, Ren X, Shaheed N, Shang X, Shao X, Shen G, Si L, Sun W, Tan A, Tao Y, Wang A, Wang M, Wang Q, Wang S, Wang S, Wang W, Wang X, Wang Z, Wei Y, Wu M, Wu W, Xia J, Xiao M, Xiao X, Xie P, Yan B, Yan X, Yang J, Yang Y, Yao Y, Yu C, Yuan Y, Yuan Z, Zeng X, Zhang D, Zhang M, Zhang P, Zhang S, Zhang S, Zhang T, Zhang W, Zhang Y, Zhang Y, Zhang Y, Zhao L, Zheng Q, Zhou J, Zhou N, Zhou X, Zhou Y, Zhou Y, Huo R, and Yu H

Abstract

We report results of a search for dark-matter-nucleon interactions via a dark mediator using optimized low-energy data from the PandaX-4T liquid xenon experiment. With the ionization-signal-only data and utilizing the Migdal effect, we set the most stringent limits on the cross section for dark matter masses ranging from 30  MeV/c^{2} to 2  GeV/c^{2}. Under the assumption that the dark mediator is a dark photon that decays into scalar dark matter pairs in the early Universe, we rule out significant parameter space of such thermal relic dark-matter model.

Published
2023
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26. Search for Light Dark Matter from the Atmosphere in PandaX-4T.

Author

Ning X, Abdukerim A, Bo Z, Chen W, Chen X, Cheng C, Cheng Z, Cui X, Fan Y, Fang D, Fu C, Fu M, Geng L, Giboni K, Gu L, Guo X, Han C, Han K, He C, He J, Huang D, Huang Y, Huang J, Huang Z, Hou R, Hou Y, Ji X, Ju Y, Li C, Li J, Li M, Li S, Li T, Lin Q, Liu J, Lu C, Lu X, Luo L, Luo Y, Ma W, Ma Y, Mao Y, Meng Y, Qi N, Qian Z, Ren X, Shaheed N, Shang X, Shao X, Shen G, Si L, Sun W, Tan A, Tao Y, Wang A, Wang M, Wang Q, Wang S, Wang S, Wang W, Wang X, Wang Z, Wei Y, Wu M, Wu W, Xia J, Xiao M, Xiao X, Xie P, Yan B, Yan X, Yang J, Yang Y, Yao Y, Yu C, Yuan Y, Yuan Z, Zeng X, Zhang D, Zhang M, Zhang P, Zhang S, Zhang S, Zhang T, Zhang W, Zhang Y, Zhang Y, Zhang Y, Zhao L, Zheng Q, Zhou J, Zhou N, Zhou X, Zhou Y, Zhou Y, Su L, and Wu L

Abstract

We report a search for light dark matter produced through the cascading decay of η mesons, which are created as a result of inelastic collisions between cosmic rays and Earth's atmosphere. We introduce a new and general framework, publicly accessible, designed to address boosted dark matter specifically, with which a full and dedicated simulation including both elastic and quasielastic processes of Earth attenuation effect on the dark matter particles arriving at the detector is performed. In the PandaX-4T commissioning data of 0.63  tonne·year exposure, no significant excess over background is observed. The first constraints on the interaction between light dark matter generated in the atmosphere and nucleus through a light scalar mediator are obtained. The lowest excluded cross section is set at 5.9×10^{-37}  cm^{2} for a dark matter mass of 0.1  MeV/c^{2} and mediator mass of 300  MeV/c^{2}. The lowest upper limit of η to the dark matter decay branching ratio is 1.6×10^{-7}.

Published
2023
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27. Search for Light Dark Matter with Ionization Signals in the PandaX-4T Experiment.

Author

Li S, Wu M, Abdukerim A, Bo Z, Chen W, Chen X, Chen Y, Cheng C, Cheng Z, Cui X, Fan Y, Fang D, Fu C, Fu M, Geng L, Giboni K, Gu L, Guo X, Han C, Han K, He C, He J, Huang D, Huang Y, Huang Z, Hou R, Ji X, Ju Y, Li C, Li J, Li M, Li S, Lin Q, Liu J, Lu X, Luo L, Luo Y, Ma W, Ma Y, Mao Y, Meng Y, Ning X, Qi N, Qian Z, Ren X, Shaheed N, Shang C, Shang X, Shen G, Si L, Sun W, Tan A, Tao Y, Wang A, Wang M, Wang Q, Wang S, Wang S, Wang W, Wang X, Wang Z, Wei Y, Wu W, Xia J, Xiao M, Xiao X, Xie P, Yan B, Yan X, Yang J, Yang Y, Yao Y, You Z, Yu C, Yuan J, Yuan Y, Yuan Z, Zeng X, Zhang D, Zhang M, Zhang P, Zhang S, Zhang S, Zhang T, Zhang Y, Zhang Y, Zhang Y, Zhao L, Zheng Q, Zhou J, Zhou N, Zhou X, Zhou Y, and Zhou Y

Subjects
Cell Nucleus, Electrons
Abstract

We report the search results of light dark matter through its interactions with shell electrons and nuclei, using the commissioning data from the PandaX-4T liquid xenon detector. Low energy events are selected to have an ionization-only signal between 60 to 200 photoelectrons, corresponding to a mean nuclear recoil energy from 0.77 to 2.54 keV and electronic recoil energy from 0.07 to 0.23 keV. With an effective exposure of 0.55  tonne·year, we set the most stringent limits within a mass range from 40  MeV/c^{2} to 10  GeV/c^{2} for pointlike dark matter-electron interaction, 100  MeV/c^{2} to 10  GeV/c^{2} for dark matter-electron interaction via a light mediator, and 3.2 to 4  GeV/c^{2} for dark matter-nucleon spin-independent interaction. For DM interaction with electrons, our limits are closing in on the parameter space predicted by the freeze-in and freeze-out mechanisms in the early Universe.

Published
2023
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28. Search for Solar ^{8}B Neutrinos in the PandaX-4T Experiment Using Neutrino-Nucleus Coherent Scattering.

Author

Ma W, Abdukerim A, Cheng C, Bo Z, Chen W, Chen X, Chen Y, Cheng Z, Cui X, Fan Y, Fang D, Fu C, Fu M, Geng L, Giboni K, Gu L, Guo X, Han C, Han K, He C, He J, Huang D, Huang Y, Huang Z, Hou R, Ji X, Ju Y, Li C, Li J, Li M, Li S, Li S, Lin Q, Liu J, Lu X, Luo L, Luo Y, Ma Y, Mao Y, Shaheed N, Meng Y, Ning X, Qi N, Qian Z, Ren X, Shang C, Shang X, Shen G, Si L, Sun W, Tan A, Tao Y, Wang A, Wang M, Wang Q, Wang S, Wang S, Wang W, Wang X, Wang Z, Wei Y, Wu M, Wu W, Xia J, Xiao M, Xiao X, Xie P, Yan B, Yan X, Yang J, Yang Y, Yu C, Yuan J, Yuan Y, Yuan Z, Zeng X, Zhang D, Zhang M, Zhang P, Zhang S, Zhang S, Zhang T, Zhang Y, Zhang Y, Zhao L, Zheng Q, Zhou J, Zhou N, Zhou X, Zhou Y, and Zhou Y

Abstract

A search for interactions from solar ^{8}B neutrinos elastically scattering off xenon nuclei using PandaX-4T commissioning data is reported. The energy threshold of this search is further lowered compared with the previous search for dark matter, with various techniques utilized to suppress the background that emerges from data with the lowered threshold. A blind analysis is performed on the data with an effective exposure of 0.48  tonne year, and no significant excess of events is observed. Among the results obtained using the neutrino-nucleus coherent scattering, our results give the best constraint on the solar ^{8}B neutrino flux. We further provide a more stringent limit on the cross section between dark matter and nucleon in the mass range from 3 to 9  GeV/c^{2}.

Published
2023
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29. Determination of Double Beta Decay Half-Life of 136 Xe with the PandaX-4T Natural Xenon Detector.

Author

Si L, Cheng Z, Abdukerim A, Bo Z, Chen W, Chen X, Chen Y, Cheng C, Cheng Y, Cui X, Fan Y, Fang D, Fu C, Fu M, Geng L, Giboni K, Gu L, Guo X, Han K, He C, He J, Huang D, Huang Y, Huang Z, Hou R, Ji X, Ju Y, Li C, Li J, Li M, Li S, Li S, Lin Q, Liu J, Lu X, Luo L, Luo Y, Ma W, Ma Y, Mao Y, Meng Y, Shaheed N, Shang X, Ning X, Qi N, Qian Z, Ren X, Shang C, Shen G, Sun W, Tan A, Tao Y, Wang A, Wang M, Wang Q, Wang S, Wang S, Wang W, Wang X, Wang Z, Wei Y, Wu M, Wu W, Xia J, Xiao M, Xiao X, Xie P, Yan B, Yan X, Yang J, Yang Y, Yu C, Yuan J, Yuan Y, Yuan Z, Zhang D, Zhang M, Zhang P, Zhang S, Zhang S, Zhang T, Zhao L, Zheng Q, Zhou J, Zhou N, Zhou X, and Zhou Y

Abstract

Precise measurement of two-neutrino double beta decay (DBD) half-life is an important step for the searches of Majorana neutrinos with neutrinoless double beta decay. We report the measurement of DBD half-life of 136 Xe using the PandaX-4T dual-phase Time Projection Chamber (TPC) with 3.7-tonne natural xenon and the first 94.9-day physics data release. The background model in the fiducial volume is well constrained in situ by events in the outer active region. With a 136 Xe exposure of 15.5 kg-year, we establish the half-life as 2.27 ± 0.03( stat. ) ± 0.10( syst. ) × 10 21 years. This is the first DBD half-life measurement with natural xenon and demonstrates the physics capability of a large-scale liquid xenon TPC in the field of rare event searches., Competing Interests: The authors declare that there is no conflict of interest regarding the publication of this article., (Copyright © 2022 Lin Si et al.)

Published
2022
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30. First Search for the Absorption of Fermionic Dark Matter with the PandaX-4T Experiment.

Author

Gu L, Abdukerim A, Bo Z, Chen W, Chen X, Chen Y, Cheng C, Cheng Y, Cheng Z, Cui X, Fan Y, Fang D, Fu C, Fu M, Geng L, Giboni K, Guo X, Han K, He C, He J, Huang D, Huang Y, Huang Z, Hou R, Ji X, Ju Y, Li C, Li J, Li M, Li S, Li S, Lin Q, Liu J, Lu X, Luo L, Luo Y, Ma W, Ma Y, Mao Y, Shaheed N, Meng Y, Ning X, Qi N, Qian Z, Ren X, Shang C, Shang X, Shen G, Si L, Sun W, Tan A, Tao Y, Wang A, Wang M, Wang Q, Wang S, Wang S, Wang W, Wang X, Wang Z, Wei Y, Wu M, Wu W, Xia J, Xiao M, Xiao X, Xie P, Yan B, Yan X, Yang J, Yang Y, Yao Y, Yu C, Yuan J, Yuan Y, Zeng X, Zhang D, Zhang M, Zhang P, Zhang S, Zhang S, Zhang T, Zhang Y, Zhao L, Zheng Q, Zhou J, Zhou N, Zhou X, Zhou Y, and Zhou Y

Abstract

Compared with the signature of dark matter elastic scattering off nuclei, the absorption of fermionic dark matter by nuclei opens up a new searching channel for light dark matter with a characteristic monoenergetic signal. In this Letter, we explore the 95.0-day data from the PandaX-4T commissioning run and report the first dedicated searching results of the fermionic dark matter absorption signal through a neutral current process. No significant signal was found, and the lowest limit on the dark matter-nucleon interaction cross section is set to be 1.5×10^{-50}  cm^{2} for a fermionic dark matter mass of 40  MeV/c^{2} with 90% confidence level.

Published
2022
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31. Search for Cosmic-Ray Boosted Sub-GeV Dark Matter at the PandaX-II Experiment.

Author

Cui X, Abdukerim A, Bo Z, Chen W, Chen X, Chen Y, Cheng C, Cheng Y, Fan Y, Fang D, Fu C, Fu M, Geng L, Giboni K, Gu L, Guo X, Han K, He C, He J, Huang D, Huang Y, Huang Z, Hou R, Ji X, Ju Y, Li C, Li M, Li S, Li S, Lin Q, Liu J, Lu X, Luo L, Ma W, Ma Y, Mao Y, Meng Y, Shaheed N, Ning X, Qi N, Qian Z, Ren X, Shang C, Shen G, Si L, Sun W, Tan A, Tao Y, Wang A, Wang M, Wang Q, Wang S, Wang S, Wang Z, Wang W, Wang X, Wu M, Wu W, Xia J, Xiao M, Xiao X, Xie P, Yan B, Yan X, Yang J, Yang Y, Yu C, Yuan J, Yuan Y, Zhang D, Zhang M, Zhang P, Zhang T, Zhao L, Zheng Q, Zhou J, Zhou N, Zhou X, Zhou Y, Ge SF, and Yuan Q

Abstract

We report a novel search for the cosmic-ray boosted dark matter using the 100  tonne·day full dataset of the PandaX-II detector located at the China Jinping Underground Laboratory. With the extra energy gained from the cosmic rays, sub-GeV dark matter particles can produce visible recoil signals in the detector. The diurnal modulations in rate and energy spectrum are utilized to further enhance the signal sensitivity. Our result excludes the dark matter-nucleon elastic scattering cross section between 10^{-31} and 10^{-28}  cm^{2} for dark matter masses from 0.1  MeV/c^{2} to 0.1  GeV/c^{2}, with a large parameter space previously unexplored by experimental collaborations.

Published
2022
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32. Dark Matter Search Results from the PandaX-4T Commissioning Run.

Author

Meng Y, Wang Z, Tao Y, Abdukerim A, Bo Z, Chen W, Chen X, Chen Y, Cheng C, Cheng Y, Cui X, Fan Y, Fang D, Fu C, Fu M, Geng L, Giboni K, Gu L, Guo X, Han K, He C, He J, Huang D, Huang Y, Huang Z, Hou R, Ji X, Ju Y, Li C, Li M, Li S, Li S, Lin Q, Liu J, Lu X, Luo L, Ma W, Ma Y, Mao Y, Shaheed N, Ning X, Qi N, Qian Z, Ren X, Shang C, Shen G, Si L, Sun W, Tan A, Wang A, Wang M, Wang Q, Wang S, Wang S, Wang W, Wang X, Wu M, Wu W, Xia J, Xiao M, Xiao X, Xie P, Yan B, Yan X, Yang J, Yang Y, Yu C, Yuan J, Yuan Y, Zhang D, Zhang M, Zhang P, Zhang T, Zhao L, Zheng Q, Zhou J, Zhou N, Zhou X, and Zhou Y

Abstract

We report the first dark matter search results using the commissioning data from PandaX-4T. Using a time projection chamber with 3.7 tonne of liquid xenon target and an exposure of 0.63  tonne·year, 1058 candidate events are identified within an approximate nuclear recoil energy window between 5 and 100 keV. No significant excess over background is observed. Our data set a stringent limit to the dark matter-nucleon spin-independent interactions, with a lowest excluded cross section (90% C.L.) of 3.8×10^{-47}  cm^{2} at a dark matter mass of 40  GeV/c^{2}.

Published
2021
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33. Search for Light Dark Matter-Electron Scattering in the PandaX-II Experiment.

Author

Cheng C, Xie P, Abdukerim A, Chen W, Chen X, Chen Y, Cui X, Fan Y, Fang D, Fu C, Fu M, Geng L, Giboni K, Gu L, Guo X, Han K, He C, He S, Huang D, Huang Y, Huang Y, Huang Z, Ji X, Ju Y, Li S, Lin Q, Liu H, Liu J, Liu L, Lu X, Ma W, Ma Y, Mao Y, Meng Y, Namwongsa P, Ni K, Ning J, Ning X, Ren X, Shaheed N, Shang C, Shen G, Si L, Tan A, Wang A, Wang H, Wang M, Wang Q, Wang S, Wang W, Wang X, Wang Z, Wu M, Wu S, Wu W, Xia J, Xiao M, Xiao X, Yan B, Yang J, Yang Y, Yu C, Yuan J, Yuan Y, Zeng X, Zhang D, Zhang T, Zhao L, Zheng Q, Zhou J, Zhou N, and Zhou X

Abstract

We report constraints on light dark matter through its interactions with shell electrons in the PandaX-II liquid xenon detector with a total 46.9  tonnes/day exposure. To effectively search for these very low energy electron recoils, ionization-only signals are selected from the data. 1821 candidates are identified within an ionization signal range between 50 and 75 photoelectrons, corresponding to a mean electronic recoil energy from 0.08 to 0.15 keV. The 90% C.L. exclusion limit on the scattering cross section between the dark matter and electron is calculated with systematic uncertainties properly taken into account. Under the assumption of point interaction, we provide the world's most stringent limit within the dark matter mass range from 15 to 30  MeV/c^{2}, with the corresponding cross section from 2.5×10^{-37} to 3.1×10^{-38}  cm^{2}.

Published
2021
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34. Constraining Dark Matter Models with a Light Mediator at the PandaX-II Experiment.

Author

Ren X, Zhao L, Abdukerim A, Chen X, Chen Y, Cui X, Fang D, Fu C, Giboni K, Giuliani F, Gu L, Guo X, Han K, He C, Huang D, He S, Huang X, Huang Z, Ji X, Ju Y, Li Y, Lin H, Liu H, Liu J, Ma Y, Mao Y, Ni K, Ning J, Tan A, Wang H, Wang M, Wang Q, Wang S, Wang X, Wu S, Xia J, Xiao M, Xie P, Yan B, Yang J, Yang Y, Yu HB, Yue J, Zhang T, Zhou J, Zhou N, Zheng Q, and Zhou X

Abstract

We search for nuclear recoil signals of dark matter models with a light mediator in PandaX-II, a direct detection experiment in the China Jinping underground laboratory. Using data collected in 2016 and 2017 runs, corresponding to a total exposure of 54 ton day, we set upper limits on the zero-momentum dark matter-nucleon cross section. These limits have a strong dependence on the mediator mass when it is comparable to or below the typical momentum transfer. We apply our results to constrain self-interacting dark matter models with a light mediator mixing with standard model particles, and set strong limits on the model parameter space for the dark matter mass ranging from 5 GeV to 10 TeV.

Published
2018
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35. Dark Matter Results from 54-Ton-Day Exposure of PandaX-II Experiment.

Author

Cui X, Abdukerim A, Chen W, Chen X, Chen Y, Dong B, Fang D, Fu C, Giboni K, Giuliani F, Gu L, Gu Y, Guo X, Guo Z, Han K, He C, Huang D, He S, Huang X, Huang Z, Ji X, Ju Y, Li S, Li Y, Lin H, Liu H, Liu J, Ma Y, Mao Y, Ni K, Ning J, Ren X, Shi F, Tan A, Wang C, Wang H, Wang M, Wang Q, Wang S, Wang X, Wang X, Wu Q, Wu S, Xiao M, Xie P, Yan B, Yang Y, Yue J, Zhang D, Zhang H, Zhang T, Zhang T, Zhao L, Zhou J, Zhou N, and Zhou X

Abstract

We report a new search for weakly interacting massive particles (WIMPs) using the combined low background data sets acquired in 2016 and 2017 from the PandaX-II experiment in China. The latest data set contains a new exposure of 77.1 live days, with the background reduced to a level of 0.8×10^{-3}  evt/kg/day, improved by a factor of 2.5 in comparison to the previous run in 2016. No excess events are found above the expected background. With a total exposure of 5.4×10^{4}  kg day, the most stringent upper limit on the spin-independent WIMP-nucleon cross section is set for a WIMP with mass larger than 100  GeV/c^{2}, with the lowest 90% C.L. exclusion at 8.6×10^{-47}  cm^{2} at 40  GeV/c^{2}.

Published
2017
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