Long-distance contributions in $K\to \pi l^{+}{l}^{-}$ Decays

This talk gives a short summary of some work \cite{FGEdeR04} realized in collaboration with E. de Rafael and concerning $K\text{ra}\pi {\mathrm{\ell }}^{+}{\mathrm{\ell }}^{-}$ decays, in a combined framework of Chiral Perturbation Theory and Large–$N\mathrm{\_}c$ QCD under the dominance of a minimal narrow resonance structure.