One-loop correction to heavy dark matter annihilation

We calculate the one-loop corrections to TeV-scale dark matter annihilation in a model where the dark matter is described by an SU(2)(L) triplet of Majorana fermions, such as the wino. We use this framework to determine the high- and low-scale <(MS)over bar > matching coefficients at both the dark matter and weak boson mass scales at one loop. Part of this calculation has previously been performed in the literature numerically; we find our analytic result differs from the earlier work and discuss potential origins of this disagreement. Our result is used to extend the dark matter annihilation rate to next-to-leading logarithmic + O(alpha(2))corrections (NLL'), which enables a precise determination of indirect detection signatures in present and upcoming experiments.