Exotic Dark Matter Search with the CDEX-10 Experiment at China’s Jinping Underground Laboratory
W. H. Dai, L. P. Jia, Haitao Ma, Q. Yue, K. Kang, Y. J. Li, Haipeng An, C. Greeshma, Jianping Chang, Y. H. Chen, Jianping Cheng, Z. Deng, C. H. Fang, X. P. Geng, Haipeng Gong, Q. Guo, X. Y. Guo, Long He, S. M. He, J. Hu, H. X. Huang, T. Huang, H. T. Jia, Xi Jiang, S. Karmakar, H. B. Li, J. M. Li, J. Li, Q. Y. Li, R. M. J. Li, X. Q. Li, Y. L. Li, Y. F. Liang, Bin Liao, F. K. Lin, S. T. Lin, S. K. Liu, Y. D. Liu, Y. Liu, Y. Y. Liu, Ziyi Liu, Yunlong Mao, Q. Y. Nie, J. H. Ning, H. Pan, Ningchun Qi, J. Ren, Xichao Ruan, Z. She, M. K. Singh, Tao Sun, C. J. Tang, W. Y. Tang, Y. Tian, G. F. Wang, L. Wang, Qing Wang, Y. Wang, Yi Wang, H. T. Wong, Yongcheng Wu, Y. C. Wu, H. Y. Xing, R. Xu, Y. Xu, Tao Xue, Yu-Liang Yan, L. T. Yang, Yi Nan, C. X. Yu, H. J. Yu, J. F. Yue, M. Zeng, Zhi Zeng, B. T. Zhang, F. S. Zhang, L. Zhang, Z. H. Zhang, Z. Y. Zhang, K. K. Zhao, M. G. Zhao, J. F. Zhou, Z. Zhou, J. J. Zhu
Abstract
A search for exotic dark matter (DM) in the sub-GeV mass range has been conducted using 205 kg day data taken from a p-type point contact germanium detector of the CDEX-10 experiment at China's Jinping underground laboratory. New low-mass dark matter searching channels, neutral current fermionic DM absorption (χ+A→ν+A) and DM-nucleus 3→2 scattering (χ+χ+A→ϕ+A), have been analyzed with an energy threshold of 160 eVee. No significant signal was found; thus new limits on the DM-nucleon interaction cross section are set for both models at the sub-GeV DM mass region. A cross section limit for the fermionic DM absorption is set to be 2.5×10^{-46} cm^{2} (90% C.L.) at DM mass of 10 MeV/c^{2}. For the DM-nucleus 3→2 scattering scenario, limits are extended to DM mass of 5 and 14 MeV/c^{2} for the massless dark photon and bound DM final state, respectively.