Abstract
With the potential for the improvements of measurement precision, the refinement of theoretical calculation on hadronic B weak decays is necessary. In this paper, we study the contributions of B mesonic distribution amplitude {Phi }_{B2} within the QCD factorization approach, and find that {Phi }_{B2} contributes to only the nonfactorizable annihilation amplitudes for the B{rightarrow }PP decays (P denotes the ground SU(3) pseudoscalar mesons). Although small, the {Phi }_{B2} contributions might be helpful for improving the performance of the QCD factorization approach, especially for the pure annihilation B_{d}{rightarrow }K^{+}K^{-} and B_{s}{rightarrow }{pi }^{+}{pi }^{-} decays.
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