Positron line radiation from halo WIMP annihilations as a dark matter signature

Details Positron line radiation from halo WIMP annihilations as a dark matter signature Positron line radiation from halo WIMP annihilations as a dark matter signature

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989plrh.rept.....t&link_type=abstract

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Astronomy and Astrophysics

Astrophysics

Astrophysics, Dark Matter, Line Spectra, Neutrinos, Positron Annihilation, Cosmic Rays, Spectral Signatures, Universe

Scientific paper

We suggest a new signature for dark matter annihilation in the halo: high energy positron line radiation. Because the cosmic ray positron spectrum falls rapidly with energy, e+'s from halo WIMP annihilations can be a significant, clean signal for very massive WIMP's (approx. greater than 30 GeV). In the case that the e+e- annihilation channel has an appreciable branch, the e+ signal should be above background in a future detector, such as have been proposed for ASTROMAG, and of potential importance as a dark matter signature. A significant e+e- branching ratio can occur for neutralinos or Dirac neutrinos. High-energy, continuum positron radiation may also be an important signature for massive neutralino annihilations, especially near or above the threshold of the W+W- and ZoZo annihilation channels.

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