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We study the role of perturbative unitarity in the resonant annihilation oftwo dark matter particles into the standard model bath. Systematicallyincluding all kinematically allowed holomorphic cuts of the correspondingforward-scattering diagram, cancelation of the singularities occurs, resultingin a fixed-order correction to the narrow-width approximation for theannihilation cross section. Unlike the standard approach based on including thefinite width of the mediator, no double counting of intermediate states occurs.

Unitarity, real-intermediate states, and fixed-order approach to resonant dark matter annihilation