2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186837Chiral low-energy constants (LECs) carry the information of short-distance dynamics involving heavier degrees of freedom not present in the chiral Lagrangian. Our knowledge of the LECs is all-important at phenomenological level because their relevance in the prediction of hadronic observables at low-energies and on the other side because they provide hints on the construction of a dual theory of QCD in the low-energy regime. I review briefly the status of these important couplings.7 pages. Talk given at the 31st International Conference of Theoretical Physics, 5-11 Sep 2007, Ustron (Katowice, Poland)High Energy Physics - Phenomenologytext