Perturbative QCD analysis of [Formula Presented] decays and power counting

We investigate the exclusive nonleptonic B meson decays (Formula presented) in the perturbative QCD formalism. It is shown that the end-point (logarithmic and linear) singularities in the decay amplitudes do not exist, after (Formula presented) and threshold resummations are included. Power counting for emission and annihilation topologies of diagrams, including both factorizable and nonfactorizable ones, is discussed with Sudakov effects taken into account. Our predictions for the branching ratios (Formula presented) are larger than those (Formula presented) from the factorization approach because of dynamical enhancement of penguin contributions. Whether this enhancement is essential for penguin-dominated modes can be justified by experimental data.