We consider a model for neutralino dark matter candidates arising in
anomaly-mediated supersymmetry breaking schemes, and examine its testability
through the search for exotic cosmic rays produced by neutralino pair
annihilations in the dark halo of the Galaxy. We find that the model is already
constrained by available antiprotons and positrons measurements and may be
further tested in upcoming measurements of these cosmic ray species. We show
also that the monochromatic gamma-ray flux from neutralino annihilations is
enhanced in this model up to two orders of magnitude with respect to
alternative scenarios. The gamma-ray flux detected by the Energetic Gamma Ray
Experiment Telescope in the direction of the Galactic center exceeds
significantly the theoretical expectation of standard emission models. We prove
that if at least 10% of this excess is due to gamma-ray radiation with
continuum energy spectrum from neutralino annihilations in the model under
investigation, the associated gamma-ray line will be detected by upcoming
gamma-ray experiments.Comment: 11 pages, 2 figure
