Tan Andi, Xiao Mengjiao, Cui Xiangyi, Chen Xun, Chen Yunhua, Fang Deqing, Fu Changbo, Giboni Karl, Giuliani Franco, Gong Haowei, Guo Xuyuan, Han Ke, Hu Shouyang, Huang Xingtao, Ji Xiangdong, Ju Yonglin, Lei Siao, Li Shaoli, Li Xiaomei, Li Xinglong, Liang Hao, Lin Qing, Liu Huaxuan, Liu Jianglai, Lorenzon Wolfgang, Ma Yugang, Mao Yajun, Ni Kaixuan, Ren Xiangxiang, Schubnell Michael, Shen Manbin, Shi Fang, Wang Hongwei, Wang Jimin, Wang Meng, Wang Qiuhong, Wang Siguang, Wang Xuming, Wang Zhou, Wu Shiyong, Xiao Xiang, Xie Pengwei, Yan Binbin, Yang Yong, Yue Jianfeng, Zeng Xionghui, Zhang Hongguang, Zhang Hua, Zhang Huanqiao, Zhang Tao, Zhao Li, Zhou Jing, Zhou Ning, Zhou Xiaopeng
Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
INPAC and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai Laboratory for Particle Physics and Cosmology, Shanghai 200240, China.
Phys Rev Lett. 2016 Sep 16;117(12):121303. doi: 10.1103/PhysRevLett.117.121303.
We report the weakly interacting massive particle (WIMP) dark matter search results using the first physics-run data of the PandaX-II 500 kg liquid xenon dual-phase time-projection chamber, operating at the China JinPing underground laboratory. No dark matter candidate is identified above background. In combination with the data set during the commissioning run, with a total exposure of 3.3×10^{4} kg day, the most stringent limit to the spin-independent interaction between the ordinary and WIMP dark matter is set for a range of dark matter mass between 5 and 1000 GeV/c^{2}. The best upper limit on the scattering cross section is found 2.5×10^{-46} cm^{2} for the WIMP mass 40 GeV/c^{2} at 90% confidence level.
我们报告了使用位于中国锦屏地下实验室运行的PandaX-II 500千克液氙双相时间投影室的首批物理运行数据进行的弱相互作用大质量粒子（WIMP）暗物质搜索结果。在背景之上未识别出暗物质候选者。结合调试运行期间的数据集，总曝光量为3.3×10⁴千克·天，针对5至1000 GeV/c²范围内的暗物质质量，对普通物质与WIMP暗物质之间的自旋无关相互作用设定了最严格的限制。在90%置信水平下，对于40 GeV/c²的WIMP质量，发现散射截面的最佳上限为2.5×10⁻⁴⁶平方厘米。
