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. 2022 Nov 23;129(22):221301.
doi: 10.1103/PhysRevLett.129.221301.

Constraints on Sub-GeV Dark Matter-Electron Scattering from the CDEX-10 Experiment

Z Y Zhang  1 , L T Yang  1 , Q Yue  1 , K J Kang  1 , Y J Li  1 , M Agartioglu  2 , H P An  1   3 , J P Chang  4 , Y H Chen  5 , J P Cheng  1   6 , W H Dai  1 , Z Deng  1 , C H Fang  7 , X P Geng  1 , H Gong  1 , Q J Guo  8 , X Y Guo  5 , L He  4 , S M He  5 , J W Hu  1 , H X Huang  9 , T C Huang  10 , H T Jia  7 , X Jiang  7 , H B Li  2 , J M Li  1 , J Li  1 , Q Y Li  7 , R M J Li  7 , X Q Li  11 , Y L Li  1 , Y F Liang  1 , B Liao  6 , F K Lin  2 , S T Lin  7 , S K Liu  7 , Y D Liu  6 , Y Liu  7 , Y Y Liu  6 , Z Z Liu  1 , H Ma  1 , Y C Mao  8 , Q Y Nie  1 , J H Ning  5 , H Pan  4 , N C Qi  5 , J Ren  9 , X C Ruan  9 , K Saraswat  2 , V Sharma  2   12 , Z She  1 , M K Singh  2   12 , T X Sun  6 , C J Tang  7 , W Y Tang  1 , Y Tian  1 , G F Wang  6 , L Wang  13 , Q Wang  1   3 , Y Wang  1   3 , Y X Wang  8 , H T Wong  2 , S Y Wu  5 , Y C Wu  1 , H Y Xing  7 , R Xu  1 , Y Xu  11 , T Xue  1 , Y L Yan  7 , C H Yeh  2 , N Yi  1 , C X Yu  11 , H J Yu  4 , J F Yue  5 , M Zeng  1 , Z Zeng  1 , B T Zhang  1 , F S Zhang  6 , L Zhang  7 , Z H Zhang  1 , K K Zhao  7 , M G Zhao  11 , J F Zhou  5 , Z Y Zhou  9 , J J Zhu  7 ; CDEX Collaboration
Affiliations

Constraints on Sub-GeV Dark Matter-Electron Scattering from the CDEX-10 Experiment

Z Y Zhang et al. Phys Rev Lett. .

Abstract

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.

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