2017/05/31 by Nuno Rosa Agostinho, David Emmanuel-Costa, J. I. Silva-Marcos
Chemistry · Physics and Astronomy · #Bottom quark #Chemistry #Cosmology and Gravitation Theories #Flavor #Higgs boson #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quark #Top quark #hep-ph
paper · pdf · doi:10.1103/physrevd.96.073006
published as Phys. Rev. D 96, 073006 (2017) · 19 pages, 2 figures References added, Figures updated. Matches version published in Phys.Rev.D
openalex created_date 2017/06/05 · openalex publication_date 2017/10/23 · arxiv created 2017/10/27 · arxiv updated 2017/10/30 · openalex updated_date 2026/08/05
We extend the standard model with two extra Higgs doublets. Making use of a symmetry principle, we present flavor symmetries based on cycle groups ZN that oblige each Higgs doublet to contribute to the mass of only one generation. The Higgs doublets couple to the fermions with different strengths and in this way accommodate the quark mass hierarchy. We systematically search for all charge configurations that naturally lead to the alignment in flavor space of the quark sectors, resulting in a Cabibbo-Kobayashi-Maskawa matrix near to the identity, determined by the quark mass hierarchy, and with the correct overall phenomenological features. The minimal realization is by the group Z7. We show that only a limited number of solutions exist and that any accidental global symmetry that may occur together with the discrete symmetry is necessarily anomalous. A phenomenological study of each class of solutions concerning predictions to the flavor-changing neutral current phenomena is also performed; for some solutions, it is possible to obtain realistic quark masses and mixing, while the flavor-violating neutral Higgs are light enough to be accessible at the LHC.