Heavy Dark Matter Annihilation from Effective Field Theory

Abstract

We formulate an effective field theory description for SU(2)${}_L$ triplet fermionic dark matter by combining nonrelativistic dark matter with gauge bosons in the soft-collinear effective theory. For a given dark matter mass, the annihilation cross section to line photons is obtained with 5% precision by simultaneously including Sommerfeld enhancement and the resummation of electroweak Sudakov logarithms at next-to-next-to-leading logarithmic order. Using these results, we present more accurate and precise predictions for the gamma-ray line signal from annihilation, updating both existing constraints and the reach of future experiments.

5 pages, 2 figures

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• Coupling Unification and Dark Matter in a Standard Model Extension with Adjoint Majorana Fermions
• Non-relativistic pair annihilation of nearly mass degenerate neutralinos and charginos III. Computation of the Sommerfeld enhancements
• NLO electroweak potentials for minimal dark matter and beyond
• Gamma-ray line from electroweakly interacting non-abelian spin-1 dark matter