  Using a modified perturbative approach that includes the Sudakov resummation
and transverse degrees of freedom we analyze the penguin-induced $B^{-} \to
\pi^{-}\phi$ decay by applying the next-to-leading order effective weak
Hamiltonian. The modified perturbative method enables us to include
nonfactorizable contributions and to control virtual momenta appearing in the
process. Besides, we apply the three-scale factorization theorem for
nonleptonic processes that offers the possibility of having the
scale-independent product of short- and long-distance parts in the amplitude of
the weak Hamiltonian. The calculation supports the results obtained in the BSW
factorization approach, illustrating the electroweak penguin dominance and the
branching ratio of order ${\cal O}(10^{-8})$. However, the estimated prediction
of 16% for the CP asymmetry is much larger than that obtained in the
factorization approach.

High Energy Physics - Phenomenology