SUSY dark matter: closing the parameter space
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We consider here the constraints in SUGRA models on the SUSY parameter space due to current experimental bounds on the light Higgs mass mh, the b s decay, the amount of neutralino cold dark matter h2, and the muon magnetic moment. Models with universal soft breaking (mSUGRA) and non-universal gaugino or Higgs masses at MGare examined. For mSUGRA, the mh, b s and h2constraints imply a lower bound on the gaugino mass of m1/2 300GeV implying the gluino and squarks have mass 700GeV, and the neutralino 120GeV. The current status of the Brookhaven muon g - 2 experiment is reviewed, and if the Standard Model (SM) contribution evaluated using the e++ e-data is correct, a 2 bound on the deviation of experiment from the SM produces an upper bound on m1/2that eliminates the "focus point" regions of parameter space. Dark matter (DM) detection cross sections range from 5 10-8pb to 5 10-10pb which would be accessible to future planned detectors. The SUSY decay Bs ++ -is seen to be accessible to the Tevatron Run 2B with 15 fb-1luminosity for tanbeta 30. The most favorable signals of SUSY for linear colliders are stau pair production and neutralino pair production, though it will require an 800GeV machine to cover the full parameter space. Non-universal models can modify some of the above results. Thus a non-universal (heavier) gluino mass at MGcan significantly reduce the lower bound constraints of b s and mh, giving rise to a lighter SUSY spectrum. A heavier up Higgs mass can open an additional region with allowed relic density arising from annihilation via the s-channel Z diagram with an O(10) larger DM detector cross section.
