We discuss all contributions from Zweig-rule-satisfying SU(3)-symmetric inelastic FSI-induced corrections in B decays to ππ, πK, KK, πη(η ′ ), and Kη(η ′ ) . It is shown how all of these FSI corrections lead to a simple redefinition of the amplitudes, permitting the use of a simple diagram-based description, in which, however, weak phases may enter in a modified way.The inclusion of FSI corrections admitted by the present data allows an arbitrary relative phase between the penguin and tree short-distance amplitudes.The FSI-induced error of the method, in which the value of the weak phase γ is to be determined by combining future results from B + , B 0 d , B 0 s decays to Kπ, is estimated to be of the order of 5 o for γ ≈ 50 o − 60 o .
We discuss all contributions from the Zweig-rule-satisfying SU͑3͒-breaking final state interactions ͑FSIs͒ in the B→ PP decays ͑neglecting charmed intermediate states͒, where PPϭ, K, KK , (Ј), and K(Ј). First, the effects of SU͑3͒ breaking in rescattering through Pomeron exchange are studied. Then, after making a plausible assumption concerning the pattern of SU͑3͒ breaking in non-Pomeron FSIs, we give general formulas for how the latter modify short-distance ͑SD͒ amplitudes. In the SU͑3͒ limit, these formulas depend on three effective parameters characterizing the strength of all non-Pomeron rescattering effects. We point out that the experimental bounds on the B→K ϩ K Ϫ branching ratio may limit the value of only one of these FSI parameters. Thus, the smallness of the B→K ϩ K Ϫ decay rate does not imply negligible rescattering effects in other decays. Assuming a vanishing value of this parameter, we perform various fits to the available B→ PP branching ratios. The fits determine the quark-diagram SD amplitudes, the two remaining FSI parameters and the weak angle ␥. While the set of all B→ PP branching ratios is well described with ␥ around its expected standard model ͑SM͒ value, the fits permit other values of ␥ as well. For a couple of such good fits, we predict asymmetries for the B→K, ϩ (Ј), K ϩ (Ј) decays as well as the values of the CP-violating parameters S and C for the time-dependent rate of B 0 (t)→ ϩ Ϫ . Apart from a problem with the recent B ϩ → ϩ asymmetry measurement, comparison with the data seems to favor the values of ␥ in accordance with SM expectations.
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