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Limits on light WIMPs with a germanium detector at 177 eVee threshold at the China Jinping Underground Laboratory
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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 ,
Y. L. Li ,
H. Y. Liao ,
F. K. Lin ,
L. C. Lü ,
H. Ma ,
S. J. Mao ,
J. Q. Qin ,
J. Ren ,
J. Ren ,
X. C. Ruan ,
M. B. Shen ,
L. Singh ,
M. K. Singh ,
A. K. Soma ,
J. Su ,
C. J. Tang ,
C. H. Tseng ,
J. M. Wang ,
L. Wang ,
Q. Wang ,
S. Y. Wu ,
Y. C. Wu ,
Y. C. Wu ,
Z. Z. Xianyu ,
R. Q. Xiao ,
H. Y. Xing ,
F. Z. Xu ,
Y. Xu ,
X. J. Xu ,
T. Xue ,
C. W. Yang ,
L. T. Yang ,
S. W. Yang ,
N. Yi ,
C. X. Yu ,
H. Yu ,
X. Z. Yu ,
X. H. Zeng ,
Z. Zeng ,
L. Zhang ,
Y. H. Zhang ,
M. G. Zhao ,
W. Zhao ,
Z. Y. Zhou ,
J. J. Zhu ,
W. B. Zhu ,
X. Z. Zhu ,
Z. H. Zhu
21 March 2014
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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.