  A fit to the present data on the cosmic ray positron fraction can be
considerably improved,if in addition to the positron production by nuclear
interactions in the universe the possible contribution from supersymmetric dark
matter annihilation is taken into account. We scan over the complete SUSY
parameter space of the Constrained Minimal Supersymmetric Model (CMSSM) and
find that in the acceptable regions the neutralino annihilation into b-bbar
quark pairs is the dominant channel with hard positrons emerging from the
semileptonic decays of the B-mesons.
