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Updated: Aug 12, 2026

Small and Wide Angle X-Ray Scattering Studies of Biological Macromolecules in Solution
Published on: January 8, 2013
Search for Light Dark Matter-Electron Scattering in the PandaX-II Experiment
Chen Cheng1, Pengwei Xie2, Abdusalam Abdukerim3
1School of Physics, Sun Yat-Sen University, Guangzhou 510275, China.
Abstract:
We report constraints on light dark matter through its interactions with shell electrons in the PandaX-II liquid xenon detector with a total 46.9 tonnes/day exposure. To effectively search for these very low energy electron recoils, ionization-only signals are selected from the data. 1821 candidates are identified within an ionization signal range between 50 and 75 photoelectrons, corresponding to a mean electronic recoil energy from 0.08 to 0.15 keV. The 90% C.L. exclusion limit on the scattering cross section between the dark matter and electron is calculated with systematic uncertainties properly taken into account. Under the assumption of point interaction, we provide the world's most stringent limit within the dark matter mass range from 15 to 30 MeV/c^{2}, with the corresponding cross section from 2.5×10^{-37} to 3.1×10^{-38} cm^{2}.
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