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Weak phases from topological-amplitude parametrization

We propose a parametrization for two-body nonleptonic $B$ meson decays, in which the various topologies of amplitudes are counted in terms of powers of the Wolfenstein parameter $λ\sim 0.22$. The weak phases and the amplitudes are determined by comparing this parametrization with available measurements. It is possible to obtain the phase $ϕ_3$ from the $B\to Kπ$ data up to theoretical uncertainty of $O(λ^3)\sim 1%$. The recently measured $B_d^0\toπ^0π^0$ branching ratio implies a large color-suppressed or penguin amplitude, and that the extraction of the phase $ϕ_2$ from the $B\toππ$ data may suffer theoretical uncertainty more than the expected one of $O(λ^2)\sim 5%$.