2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/205254Using a sequence of rational approximants and the large-Nc limit of QCD, we estimate the value of the low-energy constant C_87 which appears in the Lagrangian of Chiral Perturbation Theory at O(p^6).10 pages, 1 figure. Comments and references added. Journal versionHigh Energy Physics - PhenomenologyHigh Energy Physics - Latticetext