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Published March 15, 1991 | Published
Journal Article Open

Distinctive positron feature from particle dark-matter annihilations in the galatic halo


If the dark matter in our galactic halo consists of weakly interacting massive particles (WIMP's) heavier than the W± boson which have a significant annihilation branch into W± and Z0 pairs, e.g., a Higgsino-like neutralino, a very distinctive feature in the cosmic-ray positron spectrum arises from W+ and Z0 decays. Because of inherent astrophysical uncertainties such a signal is by no means guaranteed even if heavy WIMP's do comprise the galactic halo. However, the positron signature is virtually a "smoking gun" for particle dark matter in the halo and thus worthy of note.

Additional Information

© 1991 The American Physical Society Received 26 November 1990 This work was supported in part bu the DOE (at Chicago and at Fermilab), and by NASA (Grant No. NAGW-1340 at Fermilab). MPK would like to thank the NASA Graduate Student Researchers Program for financial assistance.

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