Abstract
L’étude expérimentale de la brisure de la symétrie CP dans les désintégrations de mésons beaux (B) a apporté des contributions majeures à notre compréhension de la nature : (i) Elle a établi que le mécanisme de Kobayashi-Maskawa est la source dominante de brisure de la symétrie CP dans les systèmes des mésons K et B. (ii) Elle a amélioré significativement la précision des paramètres qui décrivent la matrice de mélange des quarks Cabibbo–Kobayashi–Maskawa. (iii) Elle a prouvé que l’échelle d’énergie d’une nouvelle physique avec des couplages de changement de saveurs d’ordre unité, devait être supérieure à 𝒪(10 3 TeV). Des progrès sont attendus, dans cette décennie et la suivante, des expériences du LHC et Belle II. L’état de l’art de cette Physique et les perspectives des expériences futures sont discutés dans cet article.
Highlights
The noninvariance of the laws of nature under the combined action of charge conjugation (C ) and parity (P ) transformations, so-called CP violation, is a well established experimental fact since several decades and is well known to be a necessary condition for the dynamical generation of the observed baryon asymmetry of the universe (BAU) [1]
The fact that CP is a good symmetry of the strong interactions implies that CP asymmetries dominated by interference of decays with and without mixing are subject to a uniquely clean theoretical interpretation
It is worth mentioning the fact that the KobayashiMaskawa mechanism of CP violation embedded into the Standard Model appears to fail largely in accounting for the observed baryon asymmetry of the universe
Summary
The noninvariance of the laws of nature under the combined action of charge conjugation (C ) and parity (P ) transformations, so-called CP violation, is a well established experimental fact since several decades and is well known to be a necessary condition for the dynamical generation of the observed baryon asymmetry of the universe (BAU) [1]. The last two decades have seen enormous experimental progress in the study of CP violation with beauty hadrons, first at the so-called B factories and at the Large Hadron Collider (LHC). A brief review of the present experimental status and of future perspectives with CP violation in B decays, including a historical reminder and a theoretical overview, is made
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