Calculations of penguin diagrams in B decays

الأصل · EN

We analyze the effects of the space-like penguin diagrams in two body B decays B-→ K- K⁰ and B-→ π- K⁰. Special attention is paid to the operator Q₆, whose contribution is large in the BSW model, but vanishes in the PQCD method in the approximation of neglecting the masses in the final states. Suppressions of the space-like penguin diagrams are found in the PQCD method, which implies that the contributions of the space-like penguins are small compared to those of the time-like penguins.