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Area of Science:

  • Particle Physics
  • Cosmology
  • Astrophysics

Background:

  • Dark matter remains undetected, necessitating new theoretical models and detection strategies.
  • Composite dark matter candidates, like stealth dark matter, offer alternative explanations beyond WIMPs.
  • Electromagnetic interactions are crucial for direct detection experiments.

Purpose of the Study:

  • To calculate the spin-independent scattering cross section for stealth dark matter direct detection.
  • To investigate the role of electromagnetic polarizability in composite dark matter interactions.
  • To determine the potential detectability of stealth dark matter in current and future experiments.

Main Methods:

  • Lattice calculations using the background field method on quenched configurations.
  • Nonrelativistic limit analysis of dimension-7 interactions.
  • Comparison of SU(3) and SU(4) gauge theories for polarizability.

Main Results:

  • Electromagnetic polarizability leads to a lower bound on the scattering cross section for composite dark matter.
  • SU(3) and SU(4) polarizabilities are comparable when normalized to the stealth baryon mass.
  • Potentially detectable scattering cross sections for dark matter in the 200-700 GeV mass range with a xenon target.

Conclusions:

  • Stealth dark matter with masses of 200-700 GeV may be detectable via direct detection experiments.
  • The steep mass dependence of the cross section minimizes the impact of nuclear structure uncertainties.
  • Collider searches and astrophysical observations can further probe stealth dark matter.