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

Physical Review Letters
Chen ChengPandaX-II Collaboration

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}.

References

Oct 4, 2012·Physical Review Letters·Rouven EssigTomer Volansky
Jan 28, 2017·Physical Review Letters·D S AkeribUNKNOWN LUX Collaboration
Jul 12, 2017·Physical Review Letters·C AmoleUNKNOWN PICO Collaboration
Dec 9, 2017·Physical Review Letters·Changbo FuUNKNOWN PandaX-II Collaboration
Dec 9, 2017·Physical Review Letters·Xiangyi CuiUNKNOWN PandaX-II Collaboration
Aug 8, 2018·Physical Review Letters·Xiangxiang RenUNKNOWN PandaX-II Collaboration
Sep 29, 2018·Physical Review Letters·E AprileUNKNOWN XENON Collaboration <a href="#n7">7</a>
Sep 29, 2018·Physical Review Letters·P AgnesUNKNOWN DarkSide Collaboration
Nov 26, 2019·Physical Review Letters·A Aguilar-ArevaloUNKNOWN DAMIC Collaboration
Jan 11, 2020·Physical Review Letters·E AprileUNKNOWN XENON Collaboration

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