摘要
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,3.7×10-44cm2,for the spin-independent isoscalar DM-particle-nucleon scattering cross section is obtained at a DM-particle mass of 49 GeV/c2at 90%confidence level.
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,3.7×10-44cm2,for the spin-independent isoscalar DM-particle-nucleon scattering cross section is obtained at a DM-particle mass of 49 GeV/c2at 90%confidence level.
基金
supported by the 985-Ⅲ grant from Shanghai Jiao Tong University
the National Basic Research Program of China from Ministry of Science and Technology of China (Grant No.2010CB833005)
the National Natural Science Foundation of China (Grant No.11055003)
the Office of Science and Technology in Shanghai Municipal Government (Grant No.11DZ2260700)
support from China Postdoctoral Science Foundation (Grant No.2014M551395)
sponsored by Shandong University
Peking University
the University of Maryland
the University of Michigan
