Experimental Limits on Solar Reflected Dark Matter with a New Approach on Accelerated-Dark-Matter-Electron Analysis in Semiconductors.

T X Sun,S K Liu,X Q Li,Z Zeng,M G Zhao,Greeshma C,M Zeng,F K Lin,H Gong,Q Y Nie,J M Li,Y C Wu,S Y Wu,X C Ruan,L Zhang,Y H Chen,L He,X Y Guo,H P An,T Xue,B T Zhang,H B Li,S M He,H T Wong,C X Yu,L Jiang,X P Geng,J H Ning,K K Zhao,Y Tian,Z Y Zhang,Z H Zhang,H J Yu,C H Fang,L Wang,Y Y Liu,J P Cheng,K J Kang,Y L Yan,G F Wang,Y Xu,J Z Wang,S T Lin,J F Zhou,H Y Xing,J Ren,Y X Wang,Z Deng,F S Zhang,Y F Liang,C J Tang,T C Huang,T Guo,B Liao,R M J Li,N Yi,Y C Mao,J W Hu,Q J Guo,J J Zhu,Q Wang,Y L Li,R Xu,J F Yue,J Z Zhao,Cdex Collaboration ,Q Y Li,Y J Li,W H Dai,L T Yang,H Y Li,N C Qi,Y D Liu,J Li,H Pan,S Karmakar,M K Singh,Z Y Zhou,Q Yue,Y F Wang,J P Chang,H Ma,H X Huang,J X Liu,Y Liu

doi:10.1103/physrevlett.132.171001

Abstract

Recently a dark matter-electron (DM-electron) paradigm has drawn much attention. Models beyond the standard halo model describing DM accelerated by high energy celestial bodies are under intense examination as well. In this Letter, a velocity components analysis (VCA) method dedicated to swift analysis of accelerated DM-electron interactions via semiconductor detectors is proposed and the first HPGe detector-based accelerated DM-electron analysis is realized. Utilizing the method, the first germanium based constraint on sub-GeV solar reflected DM-electron interaction is presented with the 205.4 kg·day dataset from the CDEX-10 experiment. In the heavy mediator scenario, our result excels in the mass range of 5-15 keV/c^{2}, achieving a 3 orders of magnitude improvement comparing with previous semiconductor experiments. In the light mediator scenario, the strongest laboratory constraint for DM lighter than 0.1 MeV/c^{2} is presented. The result proves the feasibility and demonstrates the vast potential of the VCA technique in future accelerated DM-electron analyses with semiconductor detectors.

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