2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48923The role of penguin amplitudes in CP violating $B$ decays is reviewed, emphasizing recent progress in the analysis of electroweak penguin contributions. It is shown how these terms are included in a model-independent manner when measuring the weak phase $α$ in $B\toππ$ using isospin symmetry, and when determining the phase $γ$ from $B\to Kπ$ applying flavor SU(3). Uncertainties due to rescattering effects in $B\to Kπ$ are discussed.6 pages, invited talk presented at the 17th International Workshop on Weak Interactions and Neutrinos, Cape Town, South Africa, January 24-30 1999High Energy Physics - Phenomenologytext