χ2 analysis of the minimal supergravity model including WMAP, (g−2)μ and b→sγ constraints

Abstract

Recent results from the WMAP measurements of the cosmicbackground radiation yield very tight constraints on the relic densityof supersymmetric cold dark matter. We combine the WMAP constraintwith those from the anomalous magnetic moment of the muon and theb→sγ branching fraction in a χ2 determination overthe minimal supergravity model (mSUGRA) parameter space. The most favoured region of mSUGRAparameter space for almost all tanβ values is the hyperbolic branch/focus point (HB/FP) region, with moderate to small values of superpotential Higgs mass |μ| and large GUT scale scalar mass m0.These favoured regions of mSUGRA parameter space can be probed bydirect search experiments for supersymmetric dark matter. An exception to the HB/FP region can occur at very large tanβwith positive μ values, where wide regions allow resonance annihilation of neutralinos in the early Universe.