Cosmic-ray positrons from annihilation of weakly interacting massive particles in the Galaxy

Details Cosmic-ray positrons from annihilation of weakly interacting massive particles in the Galaxy Cosmic-ray positrons from annihilation of weakly interacting massive particles in the Galaxy

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phrvl..63..840t&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 63, Aug. 21, 1989, p. 840-843.

Physics

65

Annihilation Reactions, Galactic Cosmic Rays, Particle Production, Positrons, Weak Interactions (Field Theory), Dark Matter, Neutrinos, Pair Production, Radiation Spectra, Supersymmetry

Scientific paper

The production of cosmic-ray positrons from the annihilation of weakly interacting massive particles (WIMPs) is considered. Conventional supersymmetric-neutralino annihilation generally yields an unobservably small e(+) flux. However, a massive WIMP (not less than about 20 GeV) with a large annihilation cross section into a single e(+) e(-) pair produces a distinctive and observable shelf in the cosmic-ray e(+) spectrum. Only Dirac neutrinos obviously generate such a feature, but it may also appear in more elaborate neutralino models. Such models are constrained by upper limits on the low-energy antiproton flux.

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