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Probing Cosmic Ray Composition and Muonphilic Dark Matter via Muon Tomography.

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This study used cosmic-ray muon tomography to analyze particle composition and search for dark matter. Researchers set new limits on muon-dark matter interactions, advancing particle physics research.

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Area of Science:

  • Particle Physics
  • Cosmic Ray Physics
  • Astrophysics

Background:

  • Cosmic rays offer a unique probe for fundamental physics.
  • Muon tomography is an established technique for imaging.

Purpose of the Study:

  • To develop a novel cosmic-ray scattering experiment for simultaneous composition analysis and new physics searches.
  • To constrain parameters of hypothetical dark matter interactions.

Main Methods:

  • Utilized a resistive plate chamber muon tomography system.
  • Analyzed 1.18 million cosmic ray scattering events over 63 days.
  • Employed combined template fits to angular distributions.

Main Results:

  • Achieved ~2% precision in resolving the electron component of cosmic rays.
  • Established constraints on elastic muon-dark matter scattering cross sections.
  • Set a 95% confidence level limit of 1.61×10⁻¹⁷ cm² for 1 GeV slow dark matter.

Conclusions:

  • Demonstrated the sensitivity of muon tomography to light, muon-coupled dark matter.
  • Showcased the potential for detecting dark matter captured and thermalized within Earth.
  • Opened new avenues for exploring dark matter physics with cosmic ray experiments.