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Search for Light Dark Matter–Electron Scattering in the PandaX-II Experiment

18 Aug 2021, 11:10
15m
Oral report 4. 中微子物理、粒子天体物理与宇宙学 Parallel Session IV:Neutrino, Astroparticle Physics and Cosmology

Speaker

Mr Chen Cheng (Sun Yat-sen University)

Description

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·c2, with the corresponding cross section from 2.5×10−37 to 3.1×10−38 cm2.

Primary author

Mr Chen Cheng (Sun Yat-sen University)

Co-authors

Dr Pengwei Xie (Tsung-Dao Lee Institute) Dr Yue Meng (Shanghai Jiao Tong University)

Presentation materials