Journal
PHYSICAL REVIEW D
Volume 85, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.85.081301
Keywords
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Funding
- DOE [DE-FG02-04ER41291]
- NSF [PHY0970173]
- UC Irvine Graduate Division
- Direct For Mathematical & Physical Scien [970173] Funding Source: National Science Foundation
- Division Of Physics [970173] Funding Source: National Science Foundation
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We derive bounds on the dark matter annihilation cross-section for low-mass (5-20 GeV) dark matter annihilating primarily to up or down quarks, using the Fermi-LAT bound on gamma-rays from Milky Way satellites. For models in which dark matter-Standard Model interactions are mediated by particular contact operators, we show that these bounds can be directly translated into bounds on the dark matter-proton scattering cross section. For isospin-violating dark matter, these constraints are tight enough to begin to constrain the parameter-space consistent with experimental signals of low-mass dark matter. We discuss possible models that can evade these bounds.
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