Limits on light WIMPs with a germanium detector at 177 eVee threshold at the China Jinping Underground Laboratory
S.K. Liu, Q. Yue, K.J. Kang, J.P. Cheng, H.T. Wong, Y.J. Li, S.T. Lin,, J.P. Chang, N. Chen, Q.H. Chen, Y.H. Chen, Y.C. Chuang, Z. Deng, Q. Du, H., Gong, X.Q. Hao, H.J. He, Q.J. He, H.X. Huang, T.R. Huang, H. Jiang, H.B. Li,, J.M. Li, J. Li, J. Li, X. Li, X.Q. Li, X.Y. Li
TL;DR
This paper reports on a germanium detector experiment at CJPL achieving a low energy threshold of 177 eVee, setting new limits on light WIMP dark matter with improved sensitivity below 4.6 GeV.
Contribution
It introduces a low-threshold germanium detector at CJPL and provides new exclusion limits for light WIMPs below 4.6 GeV.
Findings
Achieved a 177 eVee energy threshold at 50% efficiency.
Set improved exclusion limits on light WIMPs below 4.6 GeV.
Collected 0.784 kg-days of data.
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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Taxonomy
TopicsDark Matter and Cosmic Phenomena · Atomic and Subatomic Physics Research · Computational Physics and Python Applications