242 citations · 1.5k across the 21 of their papers we have counts for
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hep-ph1998★ 59 cited
Matrix Elements of Electroweak Penguin Operators in the 1/Nc Expansion
M. Knecht, S. Peris, E. de Rafael
It is shown that the K -> pi pi matrix elements of the four-quark operator Q_7, generated by the electroweak penguin-like diagrams of the Standard Model, can be calculated to first…
hep-ph1998★ 74 cited
The electroweak pi^+ - pi^0 mass difference and weak matrix elements in the 1/Nc expansion
M. Knecht, S. Peris, E. de Rafael
The pi^+ - pi^0 mass difference generated by the electroweak interactions of the Standard Model is expressed, to lowest order in the chiral expansion and to leading order in alpha,…