出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：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.
