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First dark matter search results from the PandaX-I experiment |
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| Authors: | MengJiao Xiao Xiang Xiao Li Zhao XiGuang Cao Xun Chen YunHua Chen XiangYi Cui DeQing Fang 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 Tarlé 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 The PandaX Collaboration |
| Affiliation: | 1. The Institute of Nuclear and Particle Physics, Astronomy and Cosmology (INPAC) and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China 4. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China 8. Yalong River Hydropower Development Company, Ltd., 288 Shuanglin Road, Chengdu, 610051, China 3. School of Physics and Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Jinan, 250100, China 6. School of Physics, Peking University, Beijing, 100080, China 7. Department of Physics, University of Maryland, College Park, MD, 20742, USA 2. School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China 5. Department of Physics, University of Michigan, Ann Arbor, MI, 48109, USA 9. Physics Institute, University of Zürich, Zürich, Switzerland |
| 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 × 10?44 cm2, for the spin-independent isoscalar DM-particle-nucleon scattering cross section is obtained at a DM-particle mass of 49GeV/c2 at 90% confidence level. |
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