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Area of Science:

  • Particle Physics
  • Astrophysics
  • Nuclear Physics

Background:

  • Dark matter remains one of the most significant unsolved mysteries in physics.
  • Direct detection experiments aim to observe dark matter particle interactions with ordinary matter.
  • Sub-GeV dark matter, particularly via dark matter-electron scattering, is an underexplored but crucial parameter space.

Purpose of the Study:

  • To present improved constraints on sub-GeV dark matter using germanium detectors.
  • To introduce a novel calculation technique for predicting dark matter-electron scattering spectra.
  • To establish new limits on dark matter-electron scattering cross-sections.

Main Methods:

  • Utilized a 205.4 kg·day dataset from the CDEX-10 experiment.
  • Employed high-purity germanium detectors for dark matter detection.
  • Developed and applied a novel calculation technique for scattering spectra prediction.

Main Results:

  • Achieved a 3-order of magnitude improvement in constraints for heavy mediator scenarios (m_χ > 80 MeV/c²).
  • Set the most stringent dark matter-electron scattering cross-section limits to date for solid-state detectors.
  • Established new limits for heavy mediators (m_χ > 90 MeV/c²) and electric dipole coupling (m_χ > 100 MeV/c²).

Conclusions:

  • Demonstrated the feasibility of a new dark matter-electron detection method using germanium detectors.
  • Highlighted the vast potential of this technique in ultralow radioactive background environments.
  • Provided significant advancements in the search for light dark matter particles.