Sommerfeld enhancement of resonant dark matter annihilation
arXiv:2209.14343 · doi:10.1016/j.physletb.2023.137773
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.
arXiv comment15 pages, 4 figures; v2: matches published version
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