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Cosmic-ray antiprotons, positrons, and gamma rays from halo dark matter annihilationThe 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.
Document ID
19880041486
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Rudaz, S.
(Minnesota, University Minneapolis, United States)
Stecker, F. W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 13, 2013
Publication Date
February 1, 1988
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 325
ISSN: 0004-637X
Subject Category
Space Radiation
Accession Number
88A28713
Funding Number(s)
CONTRACT_GRANT: DE-AC02-83ER-40015
Distribution Limits
Public
Copyright
Other

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