摘要：
The existence of dark matter (DM) is established by overwhelming evidence in cosmological and astronomical observations. Possible interactions between dark matter (DM) particles and baryonic matter have been searched for in underground laboratories using ultra-low background detectors by directly detecting recoil signals. DM within a mass range between GeV/c2 to TeV/c2 have been mostly searched for via its elastic scattering off atomic nucleus.And sub-GeV light DM can scatter with shell electrons, which may subsequently produce sufficiently large ionization signals in the detector. Such DM-electron scatterings open up a new experimental paradigm. PandaX-4T dual-phase liquid/gas xenon dark matter detector can probe this kind of signals to search for light DM. In this talk, the introduction of PandaX-4T, analysis method and constraints on light dark matter through its interactions with shell electrons in the PandaX-4T are reported.

报告人简介：
Dr. Meng graduated from the Harbin Institute of Technology at 2008, and got her PhD degree from Virginia Tech at 2014 as a collaborator of the Daya Bay neutrino experiment. Then she joined University of Alabama as a postdoctoral associate and worked on the LZ dark matter experiment. Since 2019, she joined Shanghai Jiao Tong University, and focus dark matter search in the PandaX-4T experiment, neutrino measurement in the JUNO experiment and low radioactive techniques development.