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arxiv: 1505.00771 · v3 · pith:ND2OZRCFnew · submitted 2015-05-04 · ✦ hep-ex · astro-ph.IM· physics.ins-det

Low-mass dark matter search results from full exposure of PandaX-I experiment

PandaX Collaboration: Xiang Xiao , Xun Chen , Andi Tan , Yunhua Chen , Xiangyi Cui , Deqing Fang , Changbo Fu , Karl L. Giboni
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Haowei Gong Guodong Guo Ming He 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 Manbin Shen Yuji Shi Scott Stephenson Hongwei Wang Jiming Wang Meng Wang Siguang Wang Xuming Wang Zhou Wang Shiyong Wu Mengjiao Xiao Pengwei Xie Binbin Yan Yinghui You Xionghui Zeng Tao Zhang Li Zhao Xiaopeng Zhou Zhonghua Zhu
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classification ✦ hep-ex astro-ph.IMphysics.ins-det
keywords wimplow-masspandax-imassdarkexperimentexposurefull
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We report the results of a weakly-interacting massive particle (WIMP) dark matter search using the full 80.1\;live-day exposure of the first stage of the PandaX experiment (PandaX-I) located in the China Jin-Ping Underground Laboratory. The PandaX-I detector has been optimized for detecting low-mass WIMPs, achieving a photon detection efficiency of 9.6\%. With a fiducial liquid xenon target mass of 54.0\,kg, no significant excess event were found above the expected background. A profile likelihood analysis confirms our earlier finding that the PandaX-I data disfavor all positive low-mass WIMP signals reported in the literature under standard assumptions. A stringent bound on the low mass WIMP is set at WIMP mass below 10\,GeV/c$^2$, demonstrating that liquid xenon detectors can be competitive for low-mass WIMP searches.

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