Limits on light WIMPs with a germanium detector at 177 eVee threshold at the China Jinping Underground Laboratory
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology2014Vol. 90(3)
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S. K. Liu, Qian Yue, K. Kang, Jianping Cheng, H. T. Wong, Y. J. Li, S. T. Lin, Jianping Chang, N. Chen, Q. H. Chen, Y. H. Chen, Y. C. Chuang, Z. Deng, Q. Du, Haipeng Gong, X. Q. Hao, H. J. He, Qingming He, Han‐Xiong 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. Liao, F. K. Lin, L. C. Lü, Hao Ma, Shijie Mao, Jiangyi Qin, Jing Ren, Jing Ren, Xichao Ruan, M. B. Shen, L. Singh, M. K. Singh, A. K. Soma, J. Su, C. J. Tang, C. H. Tseng, J. M. Wang, Lai Wang, Qing Wang, Yongcheng Wu, Y. C. Wu, Y. C. Wu, Zhong-Zhi Xianyu, Rui-Qing Xiao, H. Xing, F. Z. Xu, Y. Xu, Xun-Jie Xu, T. Xue, Chengfeng Yang, L. T. Yang, S. W. Yang, Yi Nan, C. X. Yu, H. J. Yu, Xun-Zhen Yu, X. H. Zeng, Zhi Zeng, L. Zhang, Y. H. Zhang, M. G. Zhao, Wen Zhao, Z. Zhou, J. J. Zhu, W. B. Zhu, X. Z. Zhu, Zhonghua Zhu
Abstract
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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