CP Violation in Charmless b→sq̄q Transitions

With the study of CP violation in \(b\rightarrow d\) transitions seemingly in good agreement with Standard Model expectations, the subject of CPV studies in charmless \(b\rightarrow s\) transitions (including \(b\bar{s} \leftrightarrow s\bar{b}\)) became the frontier of heavy flavor research. Because there is little CPV weak phase in the controlling product of CKM matrix elements for loop induced \(b\rightarrow s\) transitions, \(V_{ts}^*V_{tb}\), any observed deviation could indicate New Physics. As transitions between 3rd to 2nd generation quarks, the subject also has \(\tau \rightarrow \mu \) transition echoes in the lepton sector, which is covered in Chap. 9. More generally, with the Sakharov conditions [1] that link CPV with the Baryon Asymmetry of the Universe (BAU), i.e. why there is no trace of antimatter in our Universe, we do expect NP sources for CPV. It is well known that the 3 generation SM falls short by many orders of magnitude from the CPV that is needed to generate the observed BAU, which has been the strongest motivation to search for New Physics in CP violation.