Shen Guofang, Bo Zihao, Chen Wei, Chen Xun, Chen Yunhua, Cheng Zhaokan, Cui Xiangyi, Fan Yingjie, Fang Deqing, Gao Zhixing, Geng Lisheng, Giboni Karl, Guo Xunan, Guo Xuyuan, Guo Zichao, Han Chencheng, Han Ke, He Changda, He Jinrong, Huang Di, Huang Houqi, Huang Junting, Hou Ruquan, Hou Yu, Ji Xiangdong, Ji Xiangpan, Ju Yonglin, Li Chenxiang, Li Jiafu, Li Mingchuan, Li Shuaijie, Li Tao, Li Zhiyuan, 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, Shan Dong, Shang Xiaofeng, Shao Xiyuan, Shen Manbin, Sun Wenliang, Tao Yi, Wang Anqing, Wang Guanbo, Wang Hao, Wang Jiamin, Wang Lei, Wang Meng, Wang Qiuhong, Wang Shaobo, Wang Siguang, Wang Wei, Wang Xiuli, Wang Xu, Wang Zhou, Wei Yuehuan, Wu Weihao, Wu Yuan, Xiao Mengjiao, Xiao Xiang, Xiong Kaizhi, Xu Yifan, Yao Shunyu, Yan Binbin, Yan Xiyu, Yang Yong, Ye Peihua, 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 Jiaxu, Zhou Jiayi, Zhou Ning, Zhou Xiaopeng, Zhou Yubo, Zhou Zhizhen, An Haipeng, Nie Haoming
Beihang University, School of Physics, Beijing 102206, China.
School of Physics and Astronomy, Shanghai Jiao Tong University, Key Laboratory for Particle Astrophysics and Cosmology (MoE), Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai 200240, China.
Phys Rev Lett. 2025 Apr 25;134(16):161003. doi: 10.1103/PhysRevLett.134.161003.
We present a novel constraint on light dark matter utilizing 1.54 metric ton/year of data acquired from the PandaX-4T dual-phase xenon time projection chamber. This constraint is derived through detecting electronic recoil signals resulting from the interaction with solar-enhanced dark matter flux. Low-mass dark matter particles, lighter than a few MeV/c^{2}, can scatter with the thermal electrons in the Sun. Consequently, with higher kinetic energy, the boosted dark matter component becomes detectable via contact scattering with xenon electrons, resulting in a few keV energy deposition that exceeds the threshold of PandaX-4T. We calculate the expected recoil energy in PandaX-4T considering the Sun's acceleration with heavy mediators and the detection capabilities of the xenon detector. The first experimental search results using the xenon detector yield the most stringent upper limits cross section of 3.51×10^{-39} cm^{2} at 0.08 MeV/c^{2} for a solar boosted dark matter mass ranging from 0.02 to 10 MeV/c^{2}, achieving a 23-fold improvement compared with earlier experimental studies.
我们利用从熊猫X-4T双相氙时间投影室获取的每年1.54公吨的数据，提出了一种对轻暗物质的全新限制。这种限制是通过检测与太阳增强的暗物质通量相互作用产生的电子反冲信号得出的。质量低于几MeV/c²的低质量暗物质粒子可以与太阳中的热电子发生散射。因此，具有较高动能的增强暗物质成分可通过与氙电子的接触散射被探测到，从而导致几keV的能量沉积，超过了熊猫X-4T的阈值。我们考虑太阳与重媒介子的加速度以及氙探测器的探测能力，计算了熊猫X-4T中预期的反冲能量。使用氙探测器的首次实验搜索结果给出了最严格的上限截面，对于质量在0.02至10 MeV/c²范围内的太阳增强暗物质，在0.08 MeV/c²时为3.51×10⁻³⁹ cm²，与早期实验研究相比提高了23倍。
