2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48229Status of nonfactorizable effects in hadronic charmless B decays is reviewed. Implications of new CLEO measurements on $B^0\toπ^+π^-$ and $B\toη' K$ are discussed. Nonfactorizable effects due to color ocet 4-quark operators are calculated using renormalization group improved QCD sum rules. The resultant B-meson lifetime ratio $τ(B^-)/τ(B_d)$ agrees with experiment.5 pages, 2 figures, talk presented at the XXIX International Conference on High Energy Physics, Vancouver, July 23-28, 1998High Energy Physics - PhenomenologyHigh Energy Physics - Experimenttext