Abstract
In this talk, we describe part of a recent work [1] on the correlation function of a V − A current with a V + A current in the framework of QCD in the limit of a large number of colours N c . The discussion takes place within two successive approximations of this theory, called MHA and MHA+V'. Results concerning the evaluation of chiral condensates of dimension six and eight, as well as matrix elements of the Q 7 and Q 8 electroweak penguin operators, are given.
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