Search for Light Dark Matter with 259 Days of Data in PandaX-4T.

作者：Minzhen Zhang, Zihao Bo, Wei Chen, Xun Chen, Yunhua Chen, Chen Cheng, Xiangyi Cui, Manna Deng, Ying-Jie Fan, Deqing Fang, Xuanye Fu, Zhixing Gao, Yujie Ge, Li-Sheng Geng, K. Giboni, Xunan Guo, Xuyuan Guo, Zi-Fan Guo, C. Han, Ke Han, Changda He, Jinrong He, Houqi Huang, Ju Huang, Yule Huang, R. Hou, X. Ji, Y. Ju, Xiao-fang Lan, Chenxiang Li, Jiafu Li, Mingchuan Li, Peiyuan Li, Shuaijie Li, Tao Li, Yangdong Li, Zhiyuan Li, Qingjie Lin, Jiang-Tao Liu, Yuanchun Liu, Congcong Lu, Xiaoying Lu, Ling-Zhi Luo, Yu-Xia Luo, Yugang Ma, Y. Mao, Y. Meng, B. Pang, Ning Qi, Zhicheng Qian, Xi-Hui Ren, Dong Shan, Xiaofeng Shang, Xiyuan Shao, Guo-Fang Shen, Manbin Shen, Wen-Jia Sun, Xu-hong Sun, Yi Tao, Yue Tian, Yuxin Tian, Anqing Wang, Guan-Bo Wang, Hao Wang, Haoyu Wang, Jiamin Wang, Lei Wang, Meng Wang, Qiuhong Wang, Shaobo Wang, Shibo Wang, Si-Cheng Wang, Wei Wang, Xu Wang, Zhou-cai Wang, Yuehuan Wei, Weihao Wu, Yuan-Bin Wu, M. Xiao, Xiang Xiao, Kaizhi Xiong, Jianqin Xu, Yifan Xu, Shunyu Yao, Binbin Yan, Xiyu Yan, Yong Yang, Pei Ye, Chun-yang Yu, Ying Yuan, Zhenjie Yuan, Youhui Yun, Xin Zeng, Peng Zhang, Shibo Zhang, Si-Yuan Zhang, Shu Zhang, Tao Zhang, Wei Zhang, Yang Zhang, Yingxin Zhang, Yuanyuan Zhang, Li Zhao, K. Zhao, Jifang Zhou, Jiaxu Zhou, Jiayi Zhou, Ning Zhou, Xiaopeng Zhou, Zhizhen Zhou, Chenhui Zhu · 发表于：Physical Review Letters · 年份：2025 · DOI：10.1103/rtnh-jn8s · 被引用次数：32 · 研究领域：Medicine、Physics

We present a search for light dark matter particles through their interactions with atomic electrons and nucleons, utilizing PandaX-4T data with an effective exposure of 1.04  tonne·year for ionization-only data and 1.20  tonne·year for paired data. Our analysis focuses on the energy range (efficiency >0.01) of approximately 0.33 to 3 keV for nuclear recoils and from 0.04 to 0.39 keV for electronic recoils. We establish the most stringent constraints on spin-independent dark matter-nucleon interactions within a mass range of 2.5-5.0  GeV/c^{2}, spin-dependent neutron-only interactions within 1.0-5.6  GeV/c^{2}, and spin-dependent proton-only interactions within 1.0-4.1  GeV/c^{2}. Their corresponding limits at 3  GeV/c^{2} are 1.1×10^{-43}, 8.4×10^{-40}, and 2.8×10^{-38}  cm^{2}, respectively. Additionally, our results improve the upper limits on the dark matter-electron scattering cross section by a factor of 1.5 and 9.3 for heavy and light mediator scenarios, respectively, within 50  MeV/c^{2} to 10  GeV/c^{2}, compared with previous best results. The improved limits reach 1.5×10^{-41} and 5.6×10^{-37}  cm^{2} at 200  MeV/c^{2} for the heavy and light mediators, respectively.