Constraints on Spin-Independent Nucleus Scattering with sub-GeV Weakly Interacting Massive Particle Dark Matter from the CDEX-1B Experiment at the China Jinping Underground Laboratory

Z Z Liu; Q Yue; L T Yang; K J Kang; Y J Li; H T Wong; M Agartioglu; H P An; J P Chang; J H Chen; Y H Chen; J P Cheng; Z Deng; Q Du; H Gong; X Y Guo; Q J Guo; L He; S M He; J W Hu; Q D Hu; H X Huang; L P Jia; H Jiang; H B Li; H Li; J M Li; J Li; X Li; X Q Li; Y L Li; B Liao; F K Lin; S T Lin; S K Liu; Y D Liu; Y Y Liu; H Ma; J L Ma; Y C Mao; J H Ning; H Pan; N C Qi; J Ren; X C Ruan; V Sharma; Z She; L Singh; M K Singh; T X Sun; C J Tang; W Y Tang; Y Tian; G F Wang; L Wang; Q Wang; Y Wang; Y X Wang; S Y Wu; Y C Wu; H Y Xing; Y Xu; T Xue; N Yi; C X Yu; H J Yu; J F Yue; M Zeng; Z Zeng; F S Zhang; M G Zhao; J F Zhou; Z Y Zhou; J J Zhu; CDEX Collaboration

doi:10.1103/PhysRevLett.123.161301

Constraints on Spin-Independent Nucleus Scattering with sub-GeV Weakly Interacting Massive Particle Dark Matter from the CDEX-1B Experiment at the China Jinping Underground Laboratory

Phys Rev Lett. 2019 Oct 18;123(16):161301. doi: 10.1103/PhysRevLett.123.161301.

Authors

Z Z Liu¹, Q Yue¹, L T Yang¹, K J Kang¹, Y J Li¹, H T Wong², M Agartioglu^{2

3}, H P An^{1

4}, J P Chang⁵, J H Chen², Y H Chen⁶, J P Cheng^{1

7}, Z Deng¹, Q Du⁸, H Gong¹, X Y Guo⁶, Q J Guo⁹, L He⁵, S M He⁶, J W Hu¹, Q D Hu¹, H X Huang¹⁰, L P Jia¹, H Jiang¹, H B Li², H Li⁵, J M Li¹, J Li¹, X Li¹⁰, X Q Li¹¹, Y L Li¹, B Liao⁷, F K Lin², S T Lin⁸, S K Liu⁸, Y D Liu⁷, Y Y Liu⁷, H Ma¹, J L Ma^{1

4}, Y C Mao⁹, J H Ning⁶, H Pan⁵, N C Qi⁶, J Ren¹⁰, X C Ruan¹⁰, V Sharma^{2

12}, Z She¹, L Singh^{2

12}, M K Singh^{2

12}, T X Sun⁷, C J Tang⁸, W Y Tang¹, Y Tian¹, G F Wang⁷, L Wang¹³, Q Wang^{1

4}, Y Wang^{1

4}, Y X Wang⁹, S Y Wu⁶, Y C Wu¹, H Y Xing⁸, Y Xu¹¹, T Xue¹, N Yi¹, C X Yu¹¹, H J Yu⁵, J F Yue⁶, M Zeng¹, Z Zeng¹, F S Zhang⁷, M G Zhao¹¹, J F Zhou⁶, Z Y Zhou¹⁰, J J Zhu⁸; CDEX Collaboration

Affiliations

¹ Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084.
² Institute of Physics, Academia Sinica, Taipei 11529.
³ Department of Physics, Dokuz Eylül University, İzmir 35160.
⁴ Department of Physics, Tsinghua University, Beijing 100084.
⁵ NUCTECH Company, Beijing 100084.
⁶ YaLong River Hydropower Development Company, Chengdu 610051.
⁷ College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875.
⁸ College of Physical Science and Technology, Sichuan University, Chengdu 610065.
⁹ School of Physics, Peking University, Beijing 100871.
¹⁰ Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413.
¹¹ School of Physics, Nankai University, Tianjin 300071.
¹² Department of Physics, Banaras Hindu University, Varanasi 221005.
¹³ Department of Physics, Beijing Normal University, Beijing 100875.

PMID: 31702340
DOI: 10.1103/PhysRevLett.123.161301

Abstract

We report results on the searches of weakly interacting massive particles (WIMPs) with sub-GeV masses (m_{χ}) via WIMP-nucleus spin-independent scattering with Migdal effect incorporated. Analysis on time-integrated (TI) and annual modulation (AM) effects on CDEX-1B data are performed, with 737.1 kg day exposure and 160 eVee threshold for TI analysis, and 1107.5 kg day exposure and 250 eVee threshold for AM analysis. The sensitive windows in m_{χ} are expanded by an order of magnitude to lower DM masses with Migdal effect incorporated. New limits on σ_{χN}^{SI} at 90% confidence level are derived as 2×10^{-32}∼7×10^{-35} cm^{2} for TI analysis at m_{χ}∼50-180 MeV/c^{2}, and 3×10^{-32}∼9×10^{-38} cm^{2} for AM analysis at m_{χ}∼75 MeV/c^{2}-3.0 GeV/c^{2}.