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First dark matter search results from the PandaX-I experiment

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arxiv 1408.5114 v2 pith:7ZOPSVCJ submitted 2014-08-21 hep-ex astro-ph.IMphysics.ins-det

PandaX Collaboration: Mengjiao Xiao , Xiang Xiao , Li Zhao , Xiguang Cao , Xun Chen , Yunhua Chen , Xiangyi Cui , Deqing Fang
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Changbo Fu Karl L. Giboni Haowei Gong Guodong Guo Jie Hu Xingtao Huang Xiangdong Ji Yonglin Ju Siao Lei Shaoli Li Qing Lin Huaxuan Liu Jianglai Liu Xiang Liu Wolfgang Lorenzon Yugang Ma Yajun Mao Kaixuan Ni Kirill Pushkin Xiangxiang Ren Michael Schubnell Manbing Shen Scott Stephenson Andi Tan Greg Tarle Hongwei Wang Jimin Wang Meng Wang Xuming Wang Zhou Wang Yuehuan Wei Shiyong Wu Pengwei Xie Yinghui You Xionghui Zeng Hua Zhang Tao Zhang Zhonghua Zhu
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classification hep-exastro-ph.IMphysics.ins-det
keywords resultsexperimentfirstlimitpandax-isearchxenoncandidate
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abstract

We report on the first dark-matter (DM) search results from PandaX-I, a low threshold dual-phase xenon experiment operating at the China Jinping Underground Laboratory. In the 37-kg liquid xenon target with 17.4 live-days of exposure, no DM particle candidate event was found. This result sets a stringent limit for low-mass DM particles and disfavors the interpretation of previously-reported positive experimental results. The minimum upper limit, $3.7\times10^{-44}$\,cm$^2$, for the spin-independent isoscalar DM-particle-nucleon scattering cross section is obtained at a DM-particle mass of 49\,GeV/c$^2$ at 90\% confidence level.

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