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Unification of gauge couplings within SUSY suggests that M$_{G}$ ≃ 2 × 10 16 GeV. The model parameters are already significantly constrained by different experimental results. Most important constraints are: (1) The light Higgs mass bound of M$_{h}$ 0 > 114 . 0 GeV from LEP [733]. (2) The b → sγ branching ratio [734]: 2 . 2 × 10 − 4 < B ( B → X$_{s}$γ ) < 4 . 5 × 10 − $^{4}$. (3) In mSUGRA the ˜ χ 0 1 is the candidate for CDM. (4) The 2 σ bound from the WMAP [13] gives a relic density bound for CDM to be 0 . 095 < Ω$_{CDM}$ h 2 < 0 . 129. (5) The bound on the lightest chargino mass of M$_{˜}$ χ ± 1 > 104 GeV from LEP [735]. (6) The possible 3 . 3 σ deviation (using e $^{+}$e − data to calculate the leading order hadronic contribution)from the SM expectation of the anomalous muon magnetic moment from the muon g − 2 collaboration [736]. 

The allowed mSUGRA parameter space has mostly three distinct regions: (i) the stau- neutralino (˜ τ$_{1}$ − ˜ χ 1 $_{0}$), coannihilation region where ˜ χ 1 0 is the LSP, (ii) the ˜ χ 1 0 having a dominant Higgsino component (focus point) and (iii) the scalar Higgs ( A $^{0}$, H $^{0}$) annihilation 

