Abstract
We study the implication of the time-dependent CP asymmetry in B → π + π − decays on the extraction of weak phases taking into account the precise measurement of sin 2β, obtained from the “gold-plated” mode B → J/ ψK s . Predictions and uncertainties for the hadronic parameters are investigated in QCD factorization. Fürthermore, independent theoretical and experimental tests of the factorization framework are briefly discussed. Finally, a model-independent bound on the unitarity triangle from CP violation in B → π + π − and B → J/ ψK S is derived.
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