来自熊猫X-II实验首批数据的自旋相关弱相互作用大质量粒子-核子截面限制
Spin-Dependent Weakly-Interacting-Massive-Particle-Nucleon Cross Section Limits from First Data of PandaX-II Experiment.
作者信息
Fu Changbo, Cui Xiangyi, Zhou Xiaopeng, Chen Xun, Chen Yunhua, Fang Deqing, Giboni Karl, Giuliani Franco, Han Ke, Huang Xingtao, Ji Xiangdong, Ju Yonglin, Lei Siao, Li Shaoli, Liu Huaxuan, Liu Jianglai, Ma Yugang, Mao Yajun, Ren Xiangxiang, Tan Andi, Wang Hongwei, Wang Jiming, Wang Meng, Wang Qiuhong, Wang Siguang, Wang Xuming, Wang Zhou, Wu Shiyong, Xiao Mengjiao, Xie Pengwei, Yan Binbin, Yang Yong, Yue Jianfeng, Zhang Hongguang, Zhang Tao, Zhao Li, Zhou Ning
机构信息
INPAC and Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai Laboratory for Particle Physics and Cosmology, Shanghai 200240, China.
School of Physics, Peking University, Beijing 100871, China.
出版信息
Phys Rev Lett. 2017 Feb 17;118(7):071301. doi: 10.1103/PhysRevLett.118.071301. Epub 2017 Feb 13.
New constraints are presented on the spin-dependent weakly-interacting-massive-particle- (WIMP-)nucleon interaction from the PandaX-II experiment, using a data set corresponding to a total exposure of 3.3×10^{4} kg day. Assuming a standard axial-vector spin-dependent WIMP interaction with ^{129}Xe and ^{131}Xe nuclei, the most stringent upper limits on WIMP-neutron cross sections for WIMPs with masses above 10 GeV/c^{2} are set in all dark matter direct detection experiments. The minimum upper limit of 4.1×10^{-41} cm^{2} at 90% confidence level is obtained for a WIMP mass of 40 GeV/c^{2}. This represents more than a factor of 2 improvement on the best available limits at this and higher masses. These improved cross-section limits provide more stringent constraints on the effective WIMP-proton and WIMP-neutron couplings.
利用对应于3.3×10⁴ kg·天的总曝光量的数据集，熊猫X-II实验给出了对自旋相关的弱相互作用大质量粒子（WIMP）-核子相互作用的新限制。假设与¹²⁹Xe和¹³¹Xe核存在标准的轴矢自旋相关WIMP相互作用，在所有暗物质直接探测实验中，对质量高于10 GeV/c²的WIMP，设定了WIMP-中子截面最严格的上限。对于质量为40 GeV/c²的WIMP，在90%置信水平下获得了4.1×10⁻⁴¹ cm²的最小上限。这比该质量及更高质量下的最佳现有限制提高了两倍多。这些改进的截面限制对有效的WIMP-质子和WIMP-中子耦合提供了更严格的约束。
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