A Distinctive positron feature from heavy WIMP annihilations in the galactic halo

Kamionkowski, Marc; Turner, Michael S.

doi:10.1103/PhysRevD.43.1774

A Distinctive positron feature from heavy WIMP annihilations in the galactic halo

Marc Kamionkowski
(
- Chicago U., EFI and
- Fermilab
)
,
Michael S. Turner
(
- Chicago U., EFI and
- Fermilab
)

Nov, 1990

23 pages

Published in:

Phys.Rev.D 43 (1991) 1774-1780

DOI:

10.1103/PhysRevD.43.1774

Report number:

FERMILAB-PUB-90-232-A

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Abstract: (APS)

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.

dark matter
postulated particle: WIMP
WIMP: annihilation
annihilation: WIMP
intermediate boson: pair production
pair production: intermediate boson
intermediate boson: leptonic decay
leptonic decay: intermediate boson
positron: cosmic radiation
cosmic radiation: flux

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