Abstract
The Belle and BaBar experiments have measured branching fractions and CP asymmetries in the charmless decay modes B 0 → π + π − , B 0 → ρ ± π ∓ , and B 0 → ρ + ρ − . From these measurements, contraints upon the CKM angle ϕ 2 can be obtained. These constraints consistently indicate that ϕ 2 is around 100°.
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