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. 2022 Nov 23;129(22):221802.
doi: 10.1103/PhysRevLett.129.221802.

Exotic Dark Matter Search with the CDEX-10 Experiment at China's Jinping Underground Laboratory

W H Dai  1 , L P Jia  1 , H Ma  1 , Q Yue  1 , K J Kang  1 , Y J Li  1 , H P An  2 , Greeshma C  3 , J P Chang  4 , Y H Chen  5 , J P Cheng  1   6 , 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 , S Karmakar  3 , H B Li  3 , 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  3 , S T Lin  7 , S K Liu  7 , Y D Liu  6 , Y Liu  7 , Y Y Liu  6 , Z Z Liu  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 , Z She  1 , M K Singh  3   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   2 , Y Wang  1   2 , Y X Wang  8 , H T Wong  3 , 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 , L T Yang  1 , 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 , Z Y 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

Exotic Dark Matter Search with the CDEX-10 Experiment at China's Jinping Underground Laboratory

W H Dai et al. Phys Rev Lett. .

Abstract

A search for exotic dark matter (DM) in the sub-GeV mass range has been conducted using 205 kg day data taken from a p-type point contact germanium detector of the CDEX-10 experiment at China's Jinping underground laboratory. New low-mass dark matter searching channels, neutral current fermionic DM absorption (χ+A→ν+A) and DM-nucleus 3→2 scattering (χ+χ+A→ϕ+A), have been analyzed with an energy threshold of 160 eVee. No significant signal was found; thus new limits on the DM-nucleon interaction cross section are set for both models at the sub-GeV DM mass region. A cross section limit for the fermionic DM absorption is set to be 2.5×10^{-46} cm^{2} (90% C.L.) at DM mass of 10 MeV/c^{2}. For the DM-nucleus 3→2 scattering scenario, limits are extended to DM mass of 5 and 14 MeV/c^{2} for the massless dark photon and bound DM final state, respectively.

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