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Sommerfeld enhancement of resonant dark matter annihilation
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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.
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Cited by 1 Pith paper
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Searching for dark matter annihilating into light long-lived mediators from stars inside dwarf spheroidal galaxies
Fermi-LAT observations of ten dwarf spheroidals place upper limits on dark matter-nucleon scattering by modeling stellar capture and annihilation through long-lived mediators.
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