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

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.