Exploring New Physics in $B \rightarrow \pi K$ Decays

TL;DR

This paper analyzes $B ightarrow  K$ decays to investigate potential signs of New Physics beyond the Standard Model, focusing on electroweak penguin effects and CP asymmetries using current and future data.

Contribution

It introduces a novel strategy for determining electroweak penguin parameters from $B ightarrow  K$ decays, enhancing the analysis of deviations from the Standard Model.

Findings

Current data show deviations from Standard Model predictions.

The proposed method improves the extraction of electroweak penguin effects.

Future Belle-II data can clarify the presence of New Physics.

Abstract

B-meson decays play an important role in flavour physics. The $B \rightarrow \pi K$ decays are dominated by QCD loop diagrams (penguins) but also electroweak penguins, where New Physics may enter, have a significant impact on the decay amplitude. Since measurements from B-factories indicate deviations from the Standard Model picture, we perform a state-of-the-art analysis to explore the correlation of the CP asymmetries and to get an updated picture. We propose a strategy for the optimal determination of the parameters which describe electroweak penguin effects and apply it to current data, utilising both neutral and charged $B \rightarrow \pi K$ decays. This new method can be fully exploited at the future Belle-II experiment, which will hopefully answer the question: Do these decays imply New Physics?