Light WIMPs Search 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

arxiv（2019）

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摘要

We present results on light weakly interacting massive particles (WIMPs) 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. Data sets with a total live-time of 3.2 years within a 4.2-year span are analyzed with physics threshold of 250 eVee. Limits on WIMP-nucleus (${\chi}$N) spin-independent cross-sections as function of WIMP mass ($m_{\chi}$) at 90\% confidence level (C.L.) are derived using the Halo Dark Matter 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_{\chi}$$<$6$~{\rm GeV/c^2}$ among WIMP AM measurements to date.

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