Penguins in CP violating B decays

TL;DR

This paper reviews the role of penguin amplitudes in CP violation in B decays, highlighting recent advances in electroweak penguin analysis and model-independent measurement techniques for weak phases.

Contribution

It introduces a model-independent approach to include electroweak penguin effects in measuring CP-violating phases in B decays using isospin and flavor SU(3) symmetries.

Findings

Electroweak penguin contributions can be incorporated model-independently.

Methods for measuring weak phases α and γ are improved.

Rescattering effects in B→Kπ decays are analyzed.

Abstract

The role of penguin amplitudes in CP violating $B$ decays is reviewed, emphasizing recent progress in the analysis of electroweak penguin contributions. It is shown how these terms are included in a model-independent manner when measuring the weak phase $\alpha$ in $B\to\pi\pi$ using isospin symmetry, and when determining the phase $\gamma$ from $B\to K\pi$ applying flavor SU(3). Uncertainties due to rescattering effects in $B\to K\pi$ are discussed.