General calculation of the cross section for dark matter annihilations into two photons

TL;DR

This paper provides a general method to calculate the non-relativistic one-loop annihilation cross section of self-conjugate dark matter particles into two photons, applicable to various models.

Contribution

It introduces a universal approach to compute dark matter annihilation into photons, encompassing multiple models and reproducing known results.

Findings

Method applicable to diverse dark matter models

Reproduces known cross sections for neutralinos, minimal dark matter, inert Higgs, and Kaluza-Klein dark matter

Provides a unified framework for dark matter photon annihilation calculations

Abstract

Assuming that the underlying model satisfies some general requirements such as renormalizability and CP conservation, we calculate the non-relativistic one-loop cross section for any self-conjugate dark matter particle annihilating into two photons. We accomplish this by carefully classifying all possible one-loop diagrams and, from them, reading off the dark matter interactions with the particles running in the loop. Our approach is general and leads to the same results found in the literature for popular dark matter candidates such as the neutralinos of the MSSM, minimal dark matter, inert Higgs and Kaluza-Klein dark matter.