2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43549Isospin analysis has been used to constrain the CP-asymmetries in B -> pi pi decays. In particular correlation between a weak phase θand a strong phase δis obtained. Further using the experimental values for the CP-average branching ratios, the following bounds on direct CP-asymmetries are obtained: -0.35+/- 0.22=< C_{π^+π^-}\leq 0; C_{π^0π^0}=-(2.4\pm 1.0) C_{π^+π^-}. Constraints on mixing induced CP-asymmetries are also discussed.four pages, no figure, Revised VersionHigh Energy Physics - Phenomenologytext