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The PAMELA positron excess is analyzed within the framework of nonuniversalSUGRA models with an extended $U(1)^n$ gauge symmetry in the hidden sectorleading to neutralino dark matter with either a mixed Higgsino-wino LSP or anessentially pure wino dominated LSP. The Higgsino-wino LSP can produce theobserved PAMELA positron excess and satisfy relic density constraints in theextended class of models due to a near degeneracy of the mass spectrum of theextended neutralino sector with the LSP mass. The simultaneous satisfaction ofthe WMAP relic density data and the PAMELA data is accomplished through aco-annihilation mechanism ($B_{\rm Co}-mechanism$), and leads to predictions ofa neutralino and a chargino in the mass range (180-200) GeV as well as lowlying sparticles accessible at colliders. We show that the models areconsistent with the antiproton constraints from PAMELA as well as photon fluxdata from EGRET and FERMI-LAT. Predictions for the scalar neutralino protoncross section relevant for the direct detection of dark matter are alsodiscussed and signatures at the LHC for these PAMELA inspired models areanalyzed. It is shown that the mixed Higgsino-wino LSP model will bediscoverable with as little as 1 fb$^{-1}$ of data and is thus a primecandidate for discovery in the low luminosity runs at the LHC.

Explaining PAMELA and WMAP data through Coannihilations in Extended SUGRA with Collider Implications