Low Energy Thresholds and the Renormalization Group in the MSSM
  We derive the 1-loop Renormalization Group Equations for the parameters of the Minimal Supersymmetric Standard Model (MSSM) taking into account the successive decoupling of each sparticle below its threshold. This is realized by a step function at the level of each graph contributing to the Renormalization Group Equations. 
A.B.Lahanas and K.Tamvakis