Photonic penguin contributions to the decay B → K ∗ γ

We analyse photonic penguin contributions to the rare decay B → K * γ by taking into account the correction of order m K * /m B and the bound state effect in the perturbative QCD framework. It is shown that the contributions coming from both of photonic penguin diagrams should be calculated since the contribution from the second photonic penguin diagram is enhanced by the bound state effect. The conclusion is model independent although numerical results depend on the meson distribution amplitude as well as on the value of the b-quark mass.