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Motivated by the possible large annihilation contributions implied by recentCDF and LHCb measurements on nonleptonic annihilation B meson decays, and therefined experimental measurements on hadronic B meson decays, we study thestrength of annihilation contributions within QCD factorization (QCDF) in thispaper. With the available measurements of two-body B_{u,d,s} -> pi pi, pi K, KK decays, a comprehensive fit on the phenomenological parameters X_A^{i,f} (orrho_A^{i,f} and phi_A^{i,f}) which are used to parameterize the endpointsingularity in annihilation amplitudes is performed with the statistical chi^2approach. It is found that (1) flavor symmetry breaking effects are hardly tobe distinguished between X_{A,s}^i and X_{A,d}^i due to the large experimentalerrors and theoretical uncertainties, where X_{A,s}^i and X_{A,d}^i are relatedto the nonfactorization annihilation contributions in B_s and B_{u,d} decays,respectively. So X_{A,s}^i = X_{A,d}^i is a good approximation by now. (2) Inprinciple, parameter X_{A}^f which is related to the factorization annihilationcontributions and independent of the initial state can be regarded as the samevariable for B_{u,d,s} decays. (3) Numerically, two solutions are found, one is(rho_A^i, phi_A^i) = (2.98^+1.12_-0.86,-105^+34_-24) and (rho_A^f, phi_A^f) =(1.18^+0.20_-0.23,-40^+11_-8), the other is (rho_A^i, phi_A^i) =(2.97^+1.19_-0.90,-105^+32_-24) and (rho_A^f, phi_A^f) =(2.80^+0.25_-0.21,165^+4_-3). Obviously, nonfactorization annihilationparameter X_A^i is generally unequal to factorization annihilation parameterX_A^f, which differ from the traditional treatment. With the fitted parameters,all results for observables of B_{u,d,s} ->pi pi, pi K, K K decays are in goodagreement with experimental data.

A Combined Fit on the Annihilation Corrections in $B_{u,d,s}$ $\to$ $PP$ Decays Within QCDF