Skip to main content
Article thumbnail
Location of Repository

Resonant scattering and recombination of pseudo-degenerate WIMPs

By Maxim Pospelov (a and Adam Ritz (a


We consider the direct and indirect detection signatures of WIMPs χ 0 in kinematic regimes with a heavier, but nearly degenerate, charged state χ ±. For small splittings of O(10) MeV, the scattering of WIMPs off nuclei may be dominated by inelastic recombination processes mediated by the formation of (χ − N) bound states, leading to a distinct signature for direct detection. These cross-sections are bound primarily by limits on the abundance of heavy isotopes, and may be considerably larger than the elastic scattering cross section in more conventional models. If the mass splitting is too large for recombination to occur, there may still be a significant resonant enhancement of loop-induced electromagnetic form-factors of the WIMP, which can enhance the elastic scattering cross-section. We also discuss how this regime affects the annihilation cross-section and indirect detection signatures, and note the possibility of a significant mono-energetic γ-signal, mediated by resonant processes near the (χ + χ − ) bound state threshold. The evidence for the existence of non-baryonic dark matter now comes from many source

OAI identifier: oai:CiteSeerX.psu:
Provided by: CiteSeerX
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • (external link)
  • (external link)
  • Suggested articles

    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.