CP Violation and Beauty Decays -- A Case Study of High Impact, High Sensitivity and Even High Precision Physics

TL;DR

This paper discusses the significance of CP violation observed in beauty decays, the potential for new physics discoveries, and the high precision theoretical tools enabling detailed analysis of these phenomena.

Contribution

It introduces a comprehensive framework linking CP violation, beauty hadron physics, and heavy quark expansions, highlighting their combined potential to test the Standard Model and explore new physics.

Findings

Predicted large CP asymmetries in B decays as tests of the KM paradigm

High parametric reliability of certain CP violation predictions

Use of novel theoretical technologies for numerical precision

Abstract

The narrative of these lectures contains three main threads: (i) CP violation despite having so far been observed only in the decays of neutral kaons has been recognized as a phenomenon of truly fundamental importance. The KM ansatz constitutes the minimal implementation of CP violation: without requiring unknown degrees of freedom it can reproduce the known CP phenomenology in a nontrivial way. (ii) The physics of beauty hadrons -- in particular their weak decays -- opens a novel window onto fundamental dynamics: they usher in a new quark family (presumably the last one); they allow us to determine fundamental quantities of the Standard Model like the $b$ quark mass and the CKM parameters $V(cb)$, $V(ub)$, $V(ts)$ and $V(td)$; they exhibit speedy or even rapid $B^0 - \bar B^0$J oscillations. (iii) Heavy Quark Expansions allow us to treat $B$ decays with an accuracy that would not have been thought possible a mere decade ago. These three threads are joined together in the following manner: (a) Huge CP asymmetries are {\em pre}dicted in $B$ decays, which represents a decisive test of the KM paradigm for CP violation. (b) Some of these predictions are made with high {\em parametric} reliability, which (c) can be translated into {\em numerical} precision through the judicious employment of novel theoretical technologies. (d) Beauty decays thus provide us with a rich and promising field to search for New Physics and even study some of its salient features. At the end of it there might quite possibly be a New Paradigm for High Energy Physics. There will be some other threads woven into this tapistry: electric dipole moments, and CP violation in other strange and in charm decays.