On the effective operators for Dark Matter annihilations

2013/01/08 by Andrea De Simone, Alexander Monin, Andrea Thamm +1
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #hep-ph

paper · pdf · doi:10.1088/1475-7516/2013/02/039

published as JCAP 1302:039,2013 · 17 pages, 4 figures

arxiv created 2013/01/08 · openalex publication_date 2013/02/26 · arxiv updated 2013/02/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

Abstract

We consider effective operators describing Dark Matter (DM) interactions with Standard Model fermions. In the non-relativistic limit of the DM field, the operators can be organized according to their mass dimension and their velocity behaviour, i.e. whether they describe s- or p-wave annihilations. The analysis is carried out for self-conjugate DM (real scalar or Majorana fermion). In this case, the helicity suppression at work in the annihilation into fermions is lifted by electroweak bremsstrahlung. We construct and study all dimension-8 operators encoding such an effect. These results are of interest in indirect DM searches.

Citations

• Gamma Ray Spectra from Dark Matter Annihilation and Decay
• Galactic antiproton spectrum at high energies: Background expectation versus exotic contributions
• Generic dark matter signature for gamma-ray telescopes
• Toward a minimum branching fraction for dark matter annihilation into electromagnetic final states
• Review of Particle Physics