Meson Electroweak Interactions in Multicolor Quantum Chromodynamics

Abstract

This PhD Thesis is mainly devoted to the study of hadronic matrix elements of kaons. Its inner structure can be divided in three parts. In Chapter 3 we address the issue of quantum corrections in Resonance Chiral Lagrangians with the aid of the 1/N_c expansion. We compute, as an illustrative example, the coupling L_10 to one loop. Chapters 4 and 5 are the main body of the present work and deal with the determination of the relevant parameters in kaon phenomenology. We give a value for the invariant B_K, the kaon mass difference and ε_K in a model-independent way, paying special attention to the issue of scale and scheme independence. In our approach, this is achieved in a very natural way once matching between long and short distances is ensured. We end up with a final chapter on the subject of duality violations in the VV-AA two-point correlator.