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In a theory with broken supersymmetry, gaugino couplings renormalizedifferently from gauge couplings, as do higgsino couplings from Higgs bosoncouplings. As a result, we expect the gauge (Higgs boson) couplings and thecorresponding gaugino (higgsino) couplings to evolve to different values underrenormalization group evolution. We re-examine the renormalization groupequations (RGEs) for these couplings in the Minimal Supersymmetric StandardModel (MSSM). To include threshold effects, we calculate the $\beta$-functionsusing a sequence of (non-supersymmetric) effective theories with heavyparticles decoupled at the scale of their mass. We find that the differencebetween the SM couplings and their SUSY cousins that is ignored in theliterature may be larger than two-loop effects which are included, and furtherthat renormalization group evolution induces a non-trivial flavour structure ingaugino interactions. We present here the coupled set of RGEs for thesedimensionless gauge and "Yukawa"-type couplings. The RGEs for the dimensionfulSSB parameters of the MSSM will be presented in a companion paper.

Threshold and Flavour Effects in the Renormalization Group Equations of the MSSM I: Dimensionless Couplings