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We discuss all contributions from Zweig-rule-satisfying SU(3)-breaking finalstate interactions (FSIs)in the B -> PP decays (neglecting charmed intermediatestates), where PP=pi pi, pi K, KK, pi eta (eta'), and K eta (eta'). First,effects of SU(3) breaking in rescattering through Pomeron exchange are studied.Then, after making a plausible assumption concerning the pattern of SU(3)breaking in non-Pomeron FSIs, we give general formulas for how the lattermodify short-distance (SD) amplitudes. In the SU(3) limit, these formulasdepend on three effective parameters characterizing the strength of allnon-Pomeron rescattering effects. We point out that the experimental bounds onthe B -> K^+K^- branching ratio may limit the value of only one of these FSIparameters. Thus, the smallness of the B -> K^+K^- decay rate does not implynegligible rescattering effects in other decays. Assuming a vanishing value ofthis parameter, we perform various fits to the available B -> PP branchingratios. The fits determine the quark-diagram SD amplitudes, the two remainingFSI parameters and the weak angle gamma. While the set of all B -> PP branchingratios is well described with gamma around its expected SM value, the fitspermit other values of gamma as well. For a couple of such good fits, wepredict asymmetries for the B -> K pi, pi^+ eta (eta'), K^+ eta (eta') decaysas well as the values of the CP-violating parameters S_{pi pi} and C_{pi pi}for the time-dependent rate of B^0(t) -> pi^+ pi^-. Apart from a problem withthe recent B^+ -> pi^+ eta asymmetry measurement, comparison with the dataseems to favour the values of gamma in accordance with SM expectations.Comment: 27 pages, 5 figure

Elastic and inelastic SU(3)-breaking final-state interactions inBdecays to pseudoscalar mesons