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

doi:10.1103/physrevlett.123.221301

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arXiv · 1904.12889

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

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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 (${\chi}$-$N$) spin-independent cross sections as function of WIMP mass ($m_{\chi}$) 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_{\chi}$$<$6$~{\rm GeV}/c^2$ among WIMP AM measurements to date.

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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. 2019-04-29. 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. https://doi.org/10.1103/physrevlett.123.221301

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