New limits on dark matter annihilation from AMS cosmic ray positron data

Abstract

The AMS experiment onboard the International Space Station has recently provided cosmic ray electron and positron data with unprecedented precision in the range from 0.5 to 350 GeV. The observed rise in the positron fraction at energies above 10 GeV remains unexplained, with proposed solutions ranging from local pulsars to TeV-scale dark matter. Here, we make use of this high quality data to place stringent limits on dark matter with masses below ~300 GeV, annihilating or decaying to leptonic final states, essentially independent of the origin of this rise. We significantly improve on existing constraints, in some cases by up to two orders of magnitude.

9 pages revtex4-1, 6 figures; minor update to match published version

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• Low energy cosmic ray positron fraction explained by charge-sign dependent solar modulation
• Implications of the Cosmic Ray Electron Spectrum and Anisotropy measured with Fermi-LAT
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