I Introduction Ii Minimal Sugra Model

The b → s ll process is studied in the minimal supergravity model in detail. Taking account of the long distance contributions from the cc resonances, we calculate the branching ratio and the lepton forward-backward asymmetry in this model. We find that there is a strong correlation between the branching ratios of b → s γ and b → s ll processes and that the interference effect can change the b → s ll branching ratio in the off-resonance regions by up to ±15% depending on the relative phase between the long and short distance contributions. Using various phenomenological constraints including the branching ratio of b → s γ, we show that there are regions in the parameter space where the branching ratio of b → s ll is enhanced by about 50% compared to the SM. We also show that the branching ratio of b → s νν is reduced at most by 10% from the SM prediction.