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Zhang, Z Y; Yang, L T; Yue, Q; Kang, K J; Li, Y J; Agartioglu, M; An, H P; Chang, J P; Chen, Y H; Cheng, J P; Dai, W H; Deng, Z; Fang, C H; Geng, X P; Gong, H; Guo, Q J; Guo, X Y; He, L; He, S M; Hu, J W; Huang, H X; Huang, T C; Jia, H T; Jiang, X; Li, H B; Li, J M; Li, J; Li, Q Y; Li, R M J; Li, X Q; Li, Y L; Liang, Y F; Liao, B; Lin, F K; Lin, S T; Liu, S K; Liu, Y D; Liu, Y; Liu, Y Y; Liu, Z Z; Ma, H; Mao, Y C; Nie, Q Y; Ning, J H; Pan, H; Qi, N C; Ren, J; Ruan, X C; Saraswat, K; Sharma, V; She, Z; Singh, M K; Sun, T X; Tang, C J; Tang, W Y; Tian, Y; Wang, G F; Wang, L; Wang, Q; Wang, Y; Wang, Y X; Wong, H T; Wu, S Y; Wu, Y C; Xing, H Y; Xu, R; Xu, Y; Xue, T; Yan, Y L; Yeh, C H; Yi, N; Yu, C X; Yu, H J; Yue, J F; Zeng, M; Zeng, Z; Zhang, B T; Zhang, F S; Zhang, L; Zhang, Z H; Zhao, K K; Zhao, M G; Zhou, J F; Zhou, Z Y; Zhu, J J
Physical review letters, 11/2022, Volume: 129, Issue: 22Journal Article
We present improved germanium-based constraints on sub-GeV dark matter via dark matter-electron (χ-e) scattering using the 205.4 kg·day dataset from the CDEX-10 experiment. Using a novel calculation technique, we attain predicted χ-e scattering spectra observable in high-purity germanium detectors. In the heavy mediator scenario, our results achieve 3 orders of magnitude of improvement for m_{χ} larger than 80 MeV/c^{2} compared to previous germanium-based χ-e results. We also present the most stringent χ-e cross-section limit to date among experiments using solid-state detectors for m_{χ} larger than 90 MeV/c^{2} with heavy mediators and m_{χ} larger than 100 MeV/c^{2} with electric dipole coupling. The result proves the feasibility and demonstrates the vast potential of a new χ-e detection method with high-purity germanium detectors in ultralow radioactive background.
