Understanding the penguin amplitude in $B\to \varphi K$ decays

Abstract

We calculate branching ratios for pure penguin decay modes, $B\to \varphi K$ decays using perturbative QCD approach. Our results of branching ratios are consistent with the experimental data and larger than those obtained from the naive factorization assumption and the QCD-improved factorization approach. This is due to a dynamical penguin enhancement in perturbative QCD approach.

Comments: 7 pages, 2 figures, version to appear in PLB