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Related Experiment Video

Updated: Jul 7, 2026

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Upper bound on the dark matter total annihilation cross section.

John F Beacom1, Nicole F Bell, Gregory D Mack

  • 1Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA.

Physical Review Letters
|February 1, 2008
PubMed
Summary

The least detectable dark matter annihilation products, neutrinos, set an upper limit on its total cross section. This finding provides a strong bound, constraining dark matter properties and halo modifications.

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Area of Science:

  • Particle Physics
  • Astrophysics
  • Cosmology

Background:

  • Dark matter constitutes a significant portion of the universe's mass.
  • Understanding dark matter's nature, particularly its annihilation properties, is crucial.
  • Previous studies have explored various dark matter annihilation channels.

Purpose of the Study:

  • To establish a robust upper bound on dark matter annihilation cross sections.
  • To investigate the implications of this bound for dark matter properties and halo structure.
  • To assess the potential for improving this bound with current and future neutrino experiments.

Main Methods:

  • Calculated the cosmic diffuse neutrino signal from dark matter annihilation.
  • Compared the predicted neutrino signal with the measured atmospheric neutrino background.
  • Derived an upper bound on the dark matter annihilation cross section.

Main Results:

  • Neutrino final states provide a strong and general upper bound on the dark matter annihilation cross section.
  • This bound is significantly stronger than the unitarity bound for relevant dark matter masses.
  • The results indicate that dark matter halos are unlikely to be substantially modified by annihilations.

Conclusions:

  • The derived bound can be evaded if dark matter annihilates into new, invisible particles.
  • Existing neutrino experiments can improve this bound by a factor of 10-100.
  • The study offers a powerful new constraint on dark matter physics.