Limits On Light Wimps With A Germanium Detector At 177 Evee Threshold At The China Jinping Underground Laboratory

S. K. Liu,Q. Yue,K. J. Kang,J. P. Cheng,H. T. Wong,Y. J. Li,S. T. Lin,J. P. Chang,N. Chen,Q. H. Chen,Y. H. Chen,Y. C. Chuang,Z. Deng, Q. Du, H. Gong, X. Q. Hao,H. J. He,Q. J. He,H. X. Huang, T. R. Huang,H. Jiang,H. B. Li,J. M. Li,J. Li,J. Li,X. Li,X. Q. Li,X. Y. Li,Y. L. Li,H. Y. Liao,F. K. Lin,L. C. Lu, H. Ma, S. J. Mao, J. Q. Qin, J. Ren, J. Ren, X. C. Ruan, M. B. Shen,L. Singh,M. K. Singh,A. K. Soma, J. Su, C. J. Tang,C. H. Tseng,J. M. Wang,L. Wang,Q. Wang,S. Y. Wu,Y. C. Wu,Y. C. Wu,Z. Z. Xianyu, R. Q. Xiao, H. Y. Xing,F. Z. Xu,Y. Xu, X. J. Xu, T. Xue,C. W. Yang, L. T. Yang,S. W. Yang, N. Yi,C. X. Yu, H. Yu,X. Z. Yu,X. H. Zeng,Z. Zeng, L. Zhang,Y. H. Zhang,M. G. Zhao,W. Zhao,Z. Y. Zhou,J. J. Zhu, W. B. Zhu,X. Z. Zhu,Z. H. Zhu

PHYSICAL REVIEW D（2014）

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摘要

The China Dark Matter Experiment reports results on light WIMP dark matter searches at the China Jinping Underground Laboratory with a germanium detector array with a total mass of 20 g. The physics threshold achieved is 177 eVee ("ee" represents electron equivalent energy) at 50% signal efficiency. With 0.784 kg-days of data, exclusion region on spin-independent coupling with the nucleon is derived, improving over our earlier bounds at WIMP mass less than 4.6 GeV.

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