Sala Seminarios IFIC (Edf. Institutos de Investigación)
Sala Seminarios IFIC
Edf. Institutos de Investigación
Descripción
In the limit when the number of colours becomes large, the QCD correlators may be described through the exchange of an infinite number of narrow-width resonances. In this seminar we explore the structure of the couplings of the high mass states, needed to recover the right QCD asymptotic behaviour. In addition, we study how it is possible to extract information for the positive q^2 regime from the euclidean amplitudes, minimizing the effect of the duality violations. The descriptions in terms of resonances and the Operator Product Expansion are compared with the experimental data, pointing out the coincidences and discrepancies.