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In the context of the Supersymmetric Standard Model with hierarchicalsfermion masses, we re-analyze the QCD corrections to Delta F=2 effectiveHamiltonian properly including effects which have been neglected so far. Thepoint is that some Delta F=2 diagrams, involving both the heavy and the lightsparticles, exhibit a logarithmic dependence on the ratio between the twomasses, signalling a sensitivity to all the momenta between the two scales. Inorder to properly deal with these terms one has to take into account the mixingbetween Delta F=1 and Delta F=2 operators. In typical situations this treatmentcan affect the result at the level of 30% or even more.

On the QCD corrections to Delta F=2 FCNC in the Supersymmetric SM with hierarchical squark masses