CP Violation in $B$ Decays (and the Search for New Physics)

TL;DR

This paper reviews measurements of CP violation in B decays, highlighting potential signs of new physics in specific decay modes and discussing how CP observables can help distinguish among models explaining current flavor anomalies.

Contribution

It provides a comprehensive overview of CP violation measurements in B decays and discusses their implications for new physics searches and model discrimination.

Findings

Hints of new physics in B to pi K and three-body decays

Discrepancies in gamma from loop and tree-level methods

Potential to distinguish models explaining flavor anomalies

Abstract

In this talk, I review the various measurements that have been made over the years of CP-violating observables in $B$ decays. These include indirect CP asymmetries, direct CP asymmetries, and triple products. All are discussed in the context of the search for new physics (NP). The only hints of NP have appeared in (i) $B \to \pi K$ decays and (ii) 3-body $B \to K\pi\pi$ and $B \to K {\bar K}K$ decays, where the extracted (loop-level) value of $\gamma$ may differ from the value found using (tree-level) $B^+ \to D^{(*)} K^{(*)+}$ decays. CP-violating observables may also be used to distinguish among the models proposed to explain the current anomalies observed in $b \to s\mu^+ \mu^-$ and $b \to c \tau {\bar\nu}_\tau$ decays.