2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/117682This talk presents a systematic procedure for the computation of the SS-PP correlator beyond the large--NC limit. The present calculation is carried on within a perturbative 1/NC framework . By constraining the meson form-factors at leading order in 1/NC, one obtains a one-loop spectral function well behaved at short distances. The Weinberg sum-rules get modified, gaining an extra contribution suppressed by 1/NC. This leads to a prediction for the low energy chiral perturbation theory coupling L8^r(mu) at the one-loop level, i.e., up to next-to-leading order in 1/NC.3 pages, 1 figure; proceedings of the IVth International Conference on Quarks and Nuclear Physics, Madrid, June 5-10 2006High Energy Physics - Phenomenologytext