2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/180033We present recent measurements of the unitarity triangle angle phi2(alpha) using B -> pi pi, B -> rho rho, and B -> rho pi decays. The measurements are based on data samples collected with the Belle and BaBar detectors at the KEKB and PEP-II e+e- colliders, respectively. We also report on a new measurement of a CP-violating asymmetry in B -> a_1+ pi- decay which will allow to constrain further the angle phi2.Presented at "Flavor Physics & CP Violation Conference, Bled, 2007", 7 pages, 8 figuresHigh Energy Physics - Experimenttext