Sommerfeld enhancement of resonant dark matter annihilation
Μ. Beneke, Stefan Lederer, K. Urban
Abstract
The dark matter annihilation cross section can be amplified by orders of magnitude if the annihilation occurs into a narrow resonance, or if the dark-matter particles experience a long-range force before annihilation (Sommerfeld effect). We show that when both enhancements are present they factorize completely, that is, all long-distance non-factorizable effects cancel at leading order in the small-velocity and narrow-width expansion. We then investigate the viability of “super-resonant” annihilation from the coaction of both mechanisms in Standard Model Higgs portal and simplified MSSM-inspired dark-matter scenarios.
Topics & Concepts
PhysicsAnnihilationDark matterParticle physicsHiggs bosonLight dark matterResonance (particle physics)FactorizationQuantum electrodynamicsScalar field dark matterNuclear physicsDark energyAstrophysicsCosmologyAlgorithmComputer scienceDark Matter and Cosmic PhenomenaParticle physics theoretical and experimental studiesCosmology and Gravitation Theories