2012/03/19 by Riccardo Barbieri, Dario Buttazzo, Filippo Sala +1 · 5 citations
Mathematics · Physics and Astronomy · #Context (archaeology) #Discrete symmetry #Electroweak interaction #Flavour #Geometry #Higgs boson #Higgs sector #Mathematics #Neutrino Physics Research #Observable #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Spontaneous symmetry breaking #Standard Model (mathematical formulation) #Supersymmetry #Symmetry (geometry) #Symmetry breaking #Theoretical physics #hep-ph
paper · pdf · doi:10.1007/jhep07(2012)181
29 pages, 5 figures
arxiv created 2012/03/19 · openalex publication_date 2012/07/01 · arxiv updated 2017/08/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The quark sector of the Standard Model exhibits an approximate U(2)3 flavour symmetry. This symmetry, broken in specific directions dictated by minimality, can explain the success of the Cabibbo-Kobayashi-Maskawa picture of flavour mixing and CP violation, confirmed by the data so far, while allowing for observable deviations from it, as expected in most models of ElectroWeak Symmetry Breaking. Building on previous work in the specific context of supersymmetry, we analyze the expected effects and we quantify the current bounds in a general Effective Field Theory framework. As a further relevant example we then show how the U(2)3 symmetry and its breaking can be implemented in a generic composite Higgs model and we make a first analysis of its peculiar consequences. We also discuss how some partial extension of U(2)3 to the lepton sector can arise, both in general and in composite Higgs models. An optimistic though conceivable interpretation of the considerations developed in this paper gives reasons to think that new physics searches in the flavour sector may be about to explore an interesting realm of phenomena.