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Search for Cosmic-Ray Boosted Sub-MeV Dark-Matter-Electron Scattering in PandaX-4T.

Xiaofeng Shang1, Abdusalam Abdukerim1, Zihao Bo1

  • 1School of Physics and Astronomy, <a href="https://ror.org/0220qvk04">Shanghai Jiao Tong University</a>, Key Laboratory for Particle Astrophysics and Cosmology (MoE), Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai 200240, China.

Physical Review Letters
|September 20, 2024
PubMed
Summary
This summary is machine-generated.

This study presents the first search for dark matter (DM) scattering off electrons using the PandaX-4T experiment. New constraints were established for sub-MeV dark matter particle interactions with electrons.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astrophysics

Background:

  • Dark matter (DM) interactions are key to understanding the universe's composition.
  • Sub-MeV DM particles are challenging to detect due to their low mass.
  • Cosmic ray interactions can accelerate DM particles, potentially making them detectable.

Purpose of the Study:

  • To conduct the first search for elastic scatterings between cosmic-ray boosted sub-MeV dark matter and electrons.
  • To set new constraints on dark matter-electron scattering cross sections.
  • To explore a novel detection channel for low-mass dark matter.

Main Methods:

  • Utilized commissioning data from the PandaX-4T liquid xenon experiment.
  • Analyzed 0.63 tonne·year of exposure data.
  • Searched for electron recoil signals induced by dark matter interactions.

Main Results:

  • Established new constraints on dark matter-electron scattering cross sections.
  • Covered dark matter particle masses from 10 eV/c² to 3 keV/c².
  • Demonstrated the sensitivity of liquid xenon detectors to sub-MeV dark matter.

Conclusions:

  • The PandaX-4T experiment provides a new avenue for probing low-mass dark matter.
  • The results significantly advance the search for dark matter-electron interactions.
  • Future analyses with larger datasets will further improve sensitivity.