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In gravity-mediated SUSY breaking models with non-universal gaugino masses,lowering the SU(3) gaugino mass |M_3| leads to a reduction in the squark andgluino masses. Lower third generation squark masses, in turn, diminish theeffect of a large top quark Yukawa coupling in the running of the higgs massparameter m_{H_u}^2, leading to a reduction in the magnitude of thesuperpotential mu parameter (relative to M_1 and M_2). A low | mu | parametergives rise to mixed higgsino dark matter (MHDM), which can efficientlyannihilate in the early universe to give a dark matter relic density in accordwith WMAP measurements. We explore the phenomenology of the low |M_3| scenario,and find for the case of MHDM increased rates for direct and indirect detectionof neutralino dark matter relative to the mSUGRA model. The sparticle massspectrum is characterized by relatively light gluinos, frequently withm(gl)<<m(sq). If scalar masses are large, then gluinos can be very light, withgl->Z_i+g loop decays dominating the gluino branching fraction. Top squarks canbe much lighter than sbottom and first/second generation squarks. The presenceof low mass higgsino-like charginos and neutralinos is expected at the CERNLHC. The small m(Z2)-m(Z1) mass gap should give rise to a visibleopposite-sign/same flavor dilepton mass edge. At a TeV scale linear e^+e^-collider, the region of MHDM will mean that the entire spectrum of charginosand neutralinos are amongst the lightest sparticles, and are most likely to beproduced at observable rates, allowing for a complete reconstruction of thegaugino-higgsino sector.Comment: 35 pages, including 26 EPS figure

Mixed Higgsino Dark Matter from a reduced SU(3) gaugino mass: consequences for dark matter and collider searches