Heavy Dark Matter Annihilation from Effective Field Theory

TL;DR

This paper develops an effective field theory framework for SU(2) triplet fermionic dark matter, enabling precise calculations of annihilation signals with improved accuracy for gamma-ray line predictions.

Contribution

It introduces a combined nonrelativistic and gauge boson effective theory for dark matter, incorporating advanced resummation techniques for precise annihilation cross section calculations.

Findings

Achieves 5% precision in annihilation cross section predictions.

Provides updated constraints and future experiment reach for gamma-ray signals.

Incorporates Sommerfeld enhancement and electroweak Sudakov resummation at NNLL order.

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.