2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47557For the first time, a solution to the $a_2/a_1$ sign problem in heavy meson decay based on PQCD factorization theorems. The point is to include QCD evolution effort characteristic scales involved in decay processes.5 pages. talk given at the APCTP workshop: Pacific Particle physics Phenomenology 31 Oct.-2 Nov.,1997,Seoul, KoreaHigh Energy Physics - Phenomenologytext