242 citations · 2.7k across the 48 of their papers we have counts for
5 papers · 2 filters
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…
Large-Nc QCD and Spontaneous Chiral Symmetry Breaking
Eduardo de Rafael
I report on recent work done in collaboration with M. Knecht on patterns of spontaneous chiral symmetry breaking in the large-Nc limit of QCD-like theories, and with S. Peris and M…
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,…
Matching Long and Short Distances in Large-Nc QCD
S. Peris, M. Perrottet, E. de Rafael
It is shown, with the example of the experimentally known Adler function, that there is no matching in the intermediate region between the two asymptotic regimes described by pertu…
An Introduction to Sum Rules in QCD
Eduardo de Rafael
Contents: 1. Introduction. 2. Sum rules prior to QCD. 3. Dispersion relations. 4. Types of two point function sum rules. 5. Non-perturbative power corrections. 6. Some examples of…