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Title:
Cosmic-ray antiprotons, positrons, and gamma rays from halo dark matter annihilation
Authors:
Rudaz, S.; Stecker, F. W.
Affiliation:
AA(Minnesota, University, Minneapolis), AB(NASA, Goddard Space Flight Center, Greenbelt, MD)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 1, 1988, p. 16-25. Research supported by the Exxon Education Foundation. (ApJ Homepage)
Publication Date:
02/1988
Category:
Space Radiation
Origin:
STI
NASA/STI Keywords:
Annihilation Reactions, Antiprotons, Dark Matter, Galactic Cosmic Rays, Gamma Rays, Positrons, Abundance, Energy Spectra, Halos, Milky Way Galaxy
DOI:
10.1086/165980
Bibliographic Code:
1988ApJ...325...16R

Abstract

The subject of cosmic ray antiproton production is reexamined by considering other choices for the nature of the Majorana fermion chi other than the photino considered in a previous article. The calculations are extended to include cosmic-ray positrons and cosmic gamma rays as annihilation products. Taking chi to be a generic higgsino or simply a heavy Majorana neutrino with standard couplings to the Z-zero boson allows the previous interpretation of the cosmic antiproton data to be maintained. In this case also, the annihilation cross section can be calculated independently of unknown particle physics parameters. Whereas the relic density of photinos with the choice of parameters in the previous paper turned out to be only a few percent of the closure density, the corresponding value for Omega in the generic higgsino or Majorana case is about 0.2, in excellent agreement with the value associated with galaxies and one which is sufficient to give the halo mass.

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