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We evaluate at next-to-next-to-leading order (NNLO) the QCD corrections tothe charm contribution from penguin diagrams to the decay K+ --> pi+ nuanti-nu. A NNLO calculation is already available in the literature. We providean independent check of the results of non-anomalous and anomalous diagrams. Weuse Renormalization Group improvement and an effective theory framework toresum the large logarithms that appear. In the case of the non-anomalousdiagrams, our results for the decoupling coefficients and anomalous dimensions,as well as the final numerical result, are in agreement with those of theprevious calculation. In the anomalous case, analytical and numericaldisagreements are observed.

Penguin diagrams in the charm sector in K+ --> pi+ nu anti-nu