Light photinos as dark matter

Details Light photinos as dark matter Light photinos as dark matter

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996nuphs..51..188f&link_type=abstract

Nuclear Physics B Proceedings Supplements, v. 51, p. 188-195.

Physics

Nuclear Physics

1

Scientific paper

In models of low-energy supersymmetry (susy) without dimension-three supersymmetry breaking terms, the photino and gluino are very light. In most of these models the lightest R-odd, color-singlet state containing a gluino, the R0, has a mass in the 1-2 GeV range and the slightly lighter photino, \~, would be the relic R-odd species. For the photino masses considered here, previous calculations resulted in an unacceptable photino relic abundance. But we point out that processes other than photino self-annihilation determine the relic abundance when the photino and R0 are close in mass. We find that the photino relic abundance is most sensitive to theR0 -to-y mass ratio, and within model uncertainties, a critical density in photinos may be obtained for anR0 -to-\~ mass ratio in the range 1.2 to 2.2. We propose photinos in the mass range of 500 MeV to 1.6 GeV as a dark matter candidate, and discuss a strategy to test the hypothesis.

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