We calculate the O(αs) corrections to the Z-penguin and electroweak box diagrams relevant for non-leptonic ∆F = 1 decays with F = S,B. This calculation provides the complete O(αWαs) and O(αWαs sin θWmt ) corrections (αW = α/ sin θW ) to the Wilson coefficients of the electroweak penguin four quark operators relevant for non-leptonic Kand B-decays. We argue that this is the dominant part of the ...

We study the influence of penguin (especially, electroweak penguin) effects on some methods of measuring the angles α, β, and γ in the CKM unitarity triangle. We use next-to-leading order effective Hamiltonian, and present numerical estimates based on the factorization approximation. We find that some techniques suggested in the literature, especially for α determination, are not workable in li...

We report on recent progress in studying two aspects of B physics, in which penguin amplitudes play an important role: 1. Bounds on penguin pollution in B(t) → ππ constraining CKM parameters, and a lower bound on B → ππ improving precision in sin 2α. 2. A suggestion for measuring the photon polarization in electroweak penguin decay, B → K1(1400)γ, providing a precision test of the Standard Model.

We present results on the NLO (α2s) spectator-scattering corrections to the topological penguin amplitudes for charmless hadronic two-body B-decays in QCD factorization. The corrections can be sizable for the colour-suppressed electroweak penguin amplitudes α 4,EW but otherwise are numerically small. Our results explicitly demonstrate factorization at this order. To assess the phenomenological ...

We report on recent progress in studying two aspects of B physics, in which penguin amplitudes play an important role: 1. Bounds on penguin pollution in B(t) → ππ constraining the CKM parameters ρ and η, and a lower bound on B → ππ improving precision in sin 2α. 2. A suggestion for measuring the photon polarization in electroweak penguin decay, B → K1(1400)γ, providing a test of the Standard Mo...

Some rare hadronic decays of B mesons, such as B → πK, are sensitive to isospin-violating contributions from physics beyond the Standard Model. Although commonly referred to as electroweak penguins, such contributions can often arise through tree-level exchanges of heavy particles, or through strong-interaction loop diagrams. The Wilson coefficients of the corresponding electroweak penguin oper...

Two-body charmless nonleptonic decays of the Bs meson are studied within the framework of generalized factorization in which factorization is applied to the tree level matrix elements while the effective Wilson coefficients are μ and renormalization scheme independent, and nonfactorizable effects are parametrized in terms of N eff c (LL) and N eff c (LR), the effective numbers of colors arising...

We perform a combined analysis of B → ππ and B → πK decays with the current experimental data. Assuming SU(3) flavor symmetry and no new physics contributions to the topological amplitudes, we demonstrate that the conventional parametrization in the Standard Model (SM) does not describe the data very well, in contrast with a similar analysis based on the earlier data. It is also shown that the ...

Rare loop-induced decays are sensitive to New Physics in many Standard Model extensions. In this paper we discuss the potential of the LHCb experiment to very rare Bs → μ μ decays, radiative penguin b → sγ decays and electroweak penguin b → sll decays. The experimental strategies and the expected sensitivities are presented. PACS. PACS-key 14.40.Nd – PACS-key 12.60.-i