2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/170534The measurements of the angle alpha (phi2) of the unitarity triangle at the B factories are reviewed. The value of alpha determined by combining the results obtained in the B to pi pi, B to rho pi, and B to rho rho modes by both the BABAR and Belle experiments is (87.5 +6.2 -5.3) degrees.7 pages, 10 postscript figures, Proceedings for Flavor Physics & CP Violation Conference, Taipei, 2008High Energy Physics - Experimenttext