Vanishing chiral couplings in the large-N_C resonance theory
  The construction of a resonance theory involving hadrons requires implementing the information from higher scales into the couplings of the effective Lagrangian. We consider the large-Nc chiral resonance theory incorporating scalars and pseudoscalars, and we find that, by imposing LO short-distance constraints on form factors of QCD currents constructed within this theory, the chiral low-energy constants satisfy resonance saturation at NLO in the 1/Nc expansion. 
Jorge Portoles (1), Ignasi Rosell (1) and Pedro Ruiz-Femenia (2) ((1)   IFIC, Valencia, (2) Max-Planck-Institut fur Physik, ...