Search for Light Weakly-Interacting-Massive-Particle Dark Matter by Annual Modulation Analysis with a Point-Contact Germanium Detector at the China Jinping Underground Laboratory

L T Yang; H B Li; Q Yue; H Ma; 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; Q J Guo; L He; J W Hu; Q D Hu; H X Huang; L P Jia; H Jiang; 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; Z Z Liu; J L Ma; Y C Mao; H Pan; J Ren; X C Ruan; V Sharma; Z She; M B Shen; L Singh; M K Singh; T X Sun; C J Tang; W Y Tang; Y Tian; G F Wang; J M 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; X H Zeng; M Zeng; Z Zeng; F S Zhang; Y H Zhang; M G Zhao; J F Zhou; Z Y Zhou; J J Zhu; Z H Zhu; CDEX Collaboration

doi:10.1103/PhysRevLett.123.221301

Search for Light Weakly-Interacting-Massive-Particle Dark Matter by Annual Modulation Analysis with a Point-Contact Germanium Detector at the China Jinping Underground Laboratory

Phys Rev Lett. 2019 Nov 29;123(22):221301. doi: 10.1103/PhysRevLett.123.221301.

Authors

L T Yang¹, H B Li², Q Yue¹, H Ma¹, K J Kang¹, Y J Li¹, H T Wong², M Agartioglu^{2

3}, H P An⁴, J P Chang⁵, J H Chen², Y H Chen⁶, J P Cheng^{1

7}, Z Deng¹, Q Du⁸, H Gong¹, Q J Guo⁹, L He⁵, J W Hu¹, Q D Hu¹, H X Huang¹⁰, L P Jia¹, H Jiang¹, 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, Z Z Liu¹, J L Ma^{1

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

12}, Z She¹, M B Shen⁶, L Singh^{2

12}, M K Singh^{2

12}, T X Sun⁷, C J Tang⁸, W Y Tang¹, Y Tian¹, G F Wang⁷, J M Wang⁶, 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, X H Zeng⁶, M Zeng¹, Z Zeng¹, F S Zhang⁷, Y H Zhang⁶, M G Zhao¹¹, J F Zhou⁶, Z Y Zhou¹⁰, J J Zhu⁸, Z H Zhu⁶; 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 610064.
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: 31868422
DOI: 10.1103/PhysRevLett.123.221301

Abstract

We present results on light weakly interacting massive particle (WIMP) searches with annual modulation (AM) analysis on data from a 1-kg mass p-type point-contact germanium detector of the CDEX-1B experiment at the China Jinping Underground Laboratory. Datasets with a total live time of 3.2 yr within a 4.2-yr span are analyzed with analysis threshold of 250 eVee. Limits on WIMP-nucleus (χ-N) spin-independent cross sections as function of WIMP mass (m_{χ}) at 90% confidence level (C.L.) are derived using the dark matter halo model. Within the context of the standard halo model, the 90% C.L. allowed regions implied by the DAMA/LIBRA and CoGeNT AM-based analysis are excluded at >99.99% and 98% C.L., respectively. These results correspond to the best sensitivity at m_{χ}<6 GeV/c^{2} among WIMP AM measurements to date.