Constraints on Spin-Independent Nucleus Scattering with sub-GeV Weakly Interacting Massive Particle Dark Matter from the CDEX-1B Experiment at the China Jin-Ping Laboratory

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

doi:10.1103/physrevlett.123.161301

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arXiv · 1905.00354

Constraints on Spin-Independent Nucleus Scattering with sub-GeV Weakly Interacting Massive Particle Dark Matter from the CDEX-1B Experiment at the China Jin-Ping Laboratory

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Abstract

We report results on the searches of weakly interacting massive particles (WIMPs) with sub-GeV masses ($m_{\chi}$) via WIMP-nucleus spin-independent scattering with Migdal effect incorporated. Analysis on time-integrated (TI) and annual modulation (AM) effects on CDEX-1B data are performed, with 737.1 kg$\cdot$day exposure and 160 eVee threshold for TI analysis, and 1107.5 kg$\cdot$day exposure and 250 eVee threshold for AM analysis. The sensitive windows in $m_{\chi}$ are expanded by an order of magnitude to lower DM masses with Migdal effect incorporated. New limits on $\sigma_{\chi N}^{\rm SI}$ at 90\% confidence level are derived as $2\times$10$^{-32}\sim7\times$10$^{-35}$ $\rm cm^2$ for TI analysis at $m_{\chi}\sim$ 50$-$180 MeV/$c^2$, and $3\times$10$^{-32}\sim9\times$10$^{-38}$ $\rm cm^2$ for AM analysis at $m_{\chi}\sim$75 MeV/$c^2-$3.0 GeV/$c^2$.

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Z. Z. Liu, Q. Yue, L. T. Yang, 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, X. Y. Guo, L. He, S. M. He, J. W. Hu, Q. D. Hu, H. X. Huang, L. P. Jia, H. Jiang, H. B. Li, 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, H. Ma, J. L. Ma, J. H. Ning, H. Pan, N. C. Qi, J. Ren, X. C. Ruan, V. Sharma, Z. She, L. Singh, M. K. Singh, T. X. Sun, C. J. Tang, W. Y. Tang, Y. Tian, G. F. Wang, L. Wang, Q. Wang, Y. 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, M. Zeng, Z. Zeng, F. S. Zhang, M. G. Zhao, J. F. Zhou, Z. Y. Zhou, J. J. Zhu. 2019-05-01. Constraints on Spin-Independent Nucleus Scattering with sub-GeV Weakly Interacting Massive Particle Dark Matter from the CDEX-1B Experiment at the China Jin-Ping Laboratory. https://doi.org/10.1103/physrevlett.123.161301

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