2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/204699We discuss a new method to determine the low-energy couplings of the $ΔS=1$ weak Hamiltonian in the $ε$-regime. It relies on a matching of the topological poles in $1/m^2$ of three-point functions of two pseudoscalar densities and a four-fermion operator computed in lattice QCD, to the same observables in the Chiral Effective Theory. We present the results of a NLO computation in chiral perturbation theory of these correlation functions together with some preliminary numerical results.7 pages. Contribution to Lattice 2007High Energy Physics - Latticetext