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A general parametrization of the B + → π + K 0 and B 0 d → π − K + decay amplitudes is presented. It relies only on the isospin symmetry of strong interactions and the phase structure of the Standard Model and involves no approximations. In particular, this parametrization takes into account both rescattering and electroweak penguin effects, which limit the theoretical accuracy of bounds on γ arising from the combined B ± → π ± K, B d → π ∓ K ± branching ratios. Generalized bounds making alsodoi:10.1007/s100529800919 fatcat:hpw3ofjtxfe2xjl3czyhnxqya4