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We review the recent determination of the matrix elements of the electroweak penguin operators Q7 and Q8 at order O(p0) and in the framework of the large-NC expansion of QCD. We discuss several issues, like the scale and scheme dependence, and compare our results to those obtained through dispersion relations and sum rules, or from numerical simulations on the lattice.

Matrix elements of electroweak penguin operators and the large N_c expansion