  This 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.
