Sala Seminarios IFIC (Edf. Institutos de Investigación)
Sala Seminarios IFIC
Edf. Institutos de Investigación
Descripción
We present a large N_c hadronic model with a single hadronic state per channel and construct all two, three-point and some four-point Green's functions in the chiral limit. These Green's functions contain all the constraints from CHPT at NLO, the large N_c structure, and the maximum of the short-distance constraints, namely, OPE and Brodsky-Lepage-like (or quark-counting-rule) ones. We point out a general problem for large N_c hadronic models that prevents from imposing all those short-distance constraints on three-point and higher Green's functions with a finite number of resonances. This problem also exists for Green's functions that vanish to all orders in massless perturbative QCD. We also give the complete result outside the chiral limit for two-point functions, and some three-point ones in the chiral limit. Three-point functions outside the chiral limit are under way. We also comment on the application to calculate the \hat B_K parameter in the chiral limit for which we present preliminary results and outside the chiral limit. (NOTE: the seminar will take place at 12:00)