Limits on light WIMPs with a 1 kg-scale germanium detector at 160 eVee physics threshold at the China Jinping Underground LaboratorySupported by the National Key Research and Development Program of China (2017YFA0402200, 2017YFA0402201), the National Natural Science Foundation of China (11175099, 11275107, 11475117, 11475099, 11475092, 11675088), the National Basic Research Program of China (973 Program) (2010CB833006). We thank the support of grants from the Tsinghua University Initiative Scientific Research Program (20121088494, 20151080354) and the Academia Sinica Investigator Award 2011-15, contracts 103-2112-M-001-024 and 104-2112-M-001-038-MY3 from the Ministry of Science and Technology of Taiwan.

Yang, Li-Tao ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ( Department of Physics, Tsinghua University, Beijing 100084, China) ; Li, Hau-Bin ( Institute of Physics, Academia Sinica, Taipei 11529, China) ; Yue, Qian ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Kang, Ke-Jun ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Cheng, Jian-Ping ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Li, Yuan-Jing ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Wong, Henry Tsz-King ( Institute of Physics, Academia Sinica, Taipei 11529, China) ; Aǧartioǧlu, M ( Institute of Physics, Academia Sinica, Taipei 11529, China) ; An, Hai-Peng ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ( Department of Physics, Tsinghua University, Beijing 100084, China) ; Chang, Jian-Ping ( NUCTECH Company, Beijing 100084, China) ; Chen, Jing-Han ( Institute of Physics, Academia Sinica, Taipei 11529, China) ; Chen, Yun-Hua ( YaLong River Hydropower Development Company, Chengdu 610051, China) ; Deng, Zhi ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Du, Qiang ( College of Physical Science and Technology, Sichuan University, Chengdu 610064, China) ; Gong, Hui ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; He, Li ( NUCTECH Company, Beijing 100084, China) ; Hu, Jin-Wei ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Hu, Qing-Dong ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Huang, Han-Xiong ( Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China) ; Jia, Li-Ping ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Jiang, Hao ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Li, Hong ( NUCTECH Company, Beijing 100084, China) ; Li, Jian-Min ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Li, Jin ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Li, Xia ( Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China) ; Li, Xue-Qian ( School of Physics, Nankai University, Tianjin 300071, China) ; Li, Yu-Lan ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Lin, Fong-Kay ( Institute of Physics, Academia Sinica, Taipei 11529, China) ; Lin, Shin-Ted ( College of Physical Science and Technology, Sichuan University, Chengdu 610064, China) ; Liu, Shu-Kui ( College of Physical Science and Technology, Sichuan University, Chengdu 610064, China) ; Liu, Zhong-Zhi ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Ma, Hao ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Ma, Jing-Lu ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Pan, Hui ( NUCTECH Company, Beijing 100084, China) ; Ren, Jie ( Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China) ; Ruan, Xi-Chao ( Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China) ; Sevda, B ( Institute of Physics, Academia Sinica, Taipei 11529, China) ; Sharma, Vivek ( Institute of Physics, Academia Sinica, Taipei 11529, China) ( Department of Physics, Banaras Hindu University, Varanasi 221005, India) ; Shen, Man-Bin ( YaLong River Hydropower Development Company, Chengdu 610051, China) ; Singh, Lakhwinder ( Institute of Physics, Academia Sinica, Taipei 11529, China) ( Department of Physics, Banaras Hindu University, Varanasi 221005, India) ; Kumar Singh, Manoj ( Institute of Physics, Academia Sinica, Taipei 11529, China) ( Department of Physics, Banaras Hindu University, Varanasi 221005, India) ; Tang, Chang-Jian ( College of Physical Science and Technology, Sichuan University, Chengdu 610064, China) ; Tang, Wei-You ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Tian, Yang ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Wang, Ji-Min ( YaLong River Hydropower Development Company, Chengdu 610051, China) ; Wang, Li ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Wang, Qing ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ( Department of Physics, Tsinghua University, Beijing 100084, China) ; Wang, Yi ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Wu, Shi-Yong ( YaLong River Hydropower Development Company, Chengdu 610051, China) ; Wu, Yu-Cheng ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Xing, Hao-Yang ( College of Physical Science and Technology, Sichuan University, Chengdu 610064, China) ; Xu, Yin ( School of Physics, Nankai University, Tianjin 300071, China) ; Xue, Tao ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Yang, Song-Wei ( Institute of Physics, Academia Sinica, Taipei 11529, China) ; Yi, Nan ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Yu, Chun-Xu ( School of Physics, Nankai University, Tianjin 300071, China) ; Yu, Hai-Jun ( NUCTECH Company, Beijing 100084, China) ; Yue, Jian-Feng ( YaLong River Hydropower Development Company, Chengdu 610051, China) ; Zeng, Xiong-Hui ( YaLong River Hydropower Development Company, Chengdu 610051, China) ; Zeng, Ming ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Zeng, Zhi ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Zhang, Yun-Hua ( YaLong River Hydropower Development Company, Chengdu 610051, China) ; Zhao, Ming-Gang ( School of Physics, Nankai University, Tianjin 300071, China) ; Zhao, Wei ( Key Laboratory of Particle and Radiation Imaging (Ministry of Education) and Department of Engineering Physics, Tsinghua University, Beijing 100084, China) ; Zhou, Ji-Fang ( YaLong River Hydropower Development Company, Chengdu 610051, China) ; Zhou, Zu-Ying ( Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China) ; Zhu, Jing-Jun ( College of Physical Science and Technology, Sichuan University, Chengdu 610064, China) ; Zhu, Zhong-Hua ( College of Physical Science and Technology, Sichuan University, Chengdu 610064, China) ; ,

08 February 2018

Abstract: We report results of a search for light weakly interacting massive particle (WIMP) dark matter from the CDEX-1 experiment at the China Jinping Underground Laboratory (CJPL). Constraints on WIMP-nucleon spin-independent (SI) and spin-dependent (SD) couplings are derived with a physics threshold of 160 eVee, from an exposure of 737.1 kg-days. The SI and SD limits extend the lower reach of light WIMPs to 2 GeV and improve over our earlier bounds at WIMP mass less than 6 GeV.


Published in: Chinese Phys. C 42 (2018) 023002
Published by: Institute of Physics Publishing/Chinese Academy of Sciences
DOI: 10.1088/1674-1137/42/2/023002
arXiv: 1710.06650
License: CC-BY-3.0



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