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This study sets new limits on dark matter detection using a SuperCDMS detector, improving constraints for low-mass particles. It also shows competitive sensitivity to dark photons with minimal data.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Astrophysics

Background:

  • Dark matter remains undetected, necessitating new experimental approaches.
  • Dark photons are hypothetical particles that could mediate interactions between dark and visible sectors.
  • Superconducting Direct Detection experiments aim to observe rare particle interactions.

Purpose of the Study:

  • To establish the first experimental limits on inelastic electron-scattering dark matter.
  • To constrain dark photon absorption using a novel detector setup.
  • To showcase the capabilities of phonon-mediated semiconductor detectors for rare event searches.

Main Methods:

  • Utilized a prototype SuperCDMS HVeV detector with 0.1 electron-hole pair charge resolution.
  • Analyzed data from a 0.93 g high-voltage device.
  • Achieved a sensitivity with 0.49 g d exposure.

Main Results:

  • Established the first limits on inelastic electron-scattering dark matter.
  • Significantly improved experimental constraints for dark matter particles down to 1 MeV/c².
  • Demonstrated dark photon absorption sensitivity competitive with leading methods.

Conclusions:

  • Phonon-mediated semiconductor detectors show great potential for detecting single electronic excitations.
  • These results pave the way for future dark matter and dark sector searches with enhanced sensitivity.