A. I. Sanda

Penguin enhancement and

We compute branching ratios of B → Kπ decays in the framework of perturbative QCD factorization theorem. Decay amplitudes are classified into the topologies of tree, penguin and annihilation, all of which contain both factorizable and nonfactorizable contributions. These contributions are expressed as the convolutions of hard b quark decay amplitudes with universal meson wave functions. It is shown that (1) matrix elements of penguin operators are dynamically enhanced compared to those employed in the factorization assumption; (2) annihilation diagrams are not negligible, contrary to common belief; (3) annihilation diagrams contribute large strong phases; (4) the uncertainty of current data of the ratio R = Br(B0 d → Kπ)/Br(B → K0π±) and of CP asymmetries is too large to give a constraint of φ3. Assuming φ3 = 90 o which is extracted from the best fit to the data of R, predictions for the branching ratios of the four B → Kπ modes are consistent with data.

B \to K \pi

Abstract We evaluate B → Kπ decay amplitudes in perturbative QCD picture. It is found that penguin contributions are dynamically enhanced by nearly 50% compared to those assumed in the factorization approximation. It is also shown that annihilation diagrams are not negligible, and give large strong phases. Our results for branching ratios of B → Kπ decays for a representative parameter set are consistent with data.

decays in perturbative QCD

We compute branching ratios of B → Kπ decays in the framework of perturbative QCD factorization theorem. Decay amplitudes are classified into the topologies of tree, penguin and annihilation, all of which contain both factorizable and nonfactorizable contributions. These contributions are expressed as the convolutions of hard b quark decay amplitudes with universal meson wave functions. It is shown that (1) matrix elements of penguin operators are dynamically enhanced compared to those employed in the factorization assumption; (2) annihilation diagrams are not negligible, contrary to common belief; (3) annihilation diagrams contribute large strong phases; (4) the uncertainty of current data of the ratio R = Br(B0 d → Kπ)/Br(B → K0π±) and of CP asymmetries is too large to give a constraint of φ3. Assuming φ3 = 90 o which is extracted from the best fit to the data of R, predictions for the branching ratios of the four B → Kπ modes are consistent with data.

Fat penguins and imaginary penguins in perturbative QCD

We calculate the

Penguin enhancement andB→Kπdecays in perturbative QCD

B\to\pi,\rho

Leading-power contributions to B → π , ρ transition form factors

transition form factors in the framework of perturbative QCD to leading power of

Hadronic light-by-light scattering contribution to muon g-2.

1/M_B

B -> D-(*) form factors in perturbative QCD

,

A ‘known’ CP asymmetry in τ decays

M_B

Nonfactorizable contributions to B ---> D**(*) M decays

being the