Abstract
The effect of inelastic final-state interactions (IFSIs) on the determination of the weak phase α from the isospin triangles of B → ππ is qualitatively illustrated. Neglecting the electroweak penguins and IFSIs and assuming the dominance of the top-quark loop in strong penguin diagrams, we propose an experimentally accessible way to approximately determine α and the penguin amplitude in B d → ππ. This approach relies on a simplified isospin consideration and the factorization approximation, and its feasibility is irrelevant to the time-dependent measurements of B d → ππ.
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