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We propose a simple model of supersymmetric dark matter that can explainrecent results from PAMELA and ATIC experiments. It is based on a U(1)_B-Lextension of the minimal supersymmetric standard model. The dark matterparticle is a linear combination of the U(1)_B-L gaugino and Higgsino partnersof Higgs fields that break the B-L around one TeV. The dominant mode of darkmatter annihilation is to the lightest of the new Higgs fields, which has amass in the GeV range, and its subsequent decay mainly produces taus or muonsby the virtue of B-L charges. This light Higgs also results in Sommerfeldenhancement of the dark matter annihilation cross section, which can be >~10^3. For a dark matter mass in the 1-2 TeV range, the model provides a goodfit to the PAMELA data and a reasonable fit to the ATIC data. We also brieflydiscuss the prospects of this model for direct detection experiments and theLHC.

A Supersymmetric B-L Dark Matter Model and the Observed Anomalies in the Cosmic Rays