Higgs couplings and new signals from Flavon-Higgs mixing effects within multi-scalar models

Abstract

Testing the properties of the Higgs particle discovered at the LHC and searching for new physics signals, are some of the most important tasks of Particle Physics today. Current measurements of the Higgs couplings to fermions and gauge bosons, seem consistent with the Standard Model, and when taken as a function of the particle mass, should lay on a single line. However, in models with an extended Higgs sector the diagonal Higgs couplings to up-quarks, down-quarks and charged leptons, could lay on different lines, while non-diagonal flavor-violating Higgs couplings could appear too. We describe these possibilities within the context of multi-Higgs doublet models that employ the Froggatt-Nielsen (FN) mechanism to generate the Yukawa hierarchies. Furthermore, one of the doublets can be chosen to be of the inert type, which provides a viable dark matter candidate. The mixing of the Higgs doublets with the flavon field, can provide plenty of interesting signals, including: i) small corrections to the couplings of the SM-like Higgs, ii) exotic signals from the flavon fields, iii) new signatures from the heavy Higgs bosons. These aspects are studied within a specific model with 3+1 Higgs doublets and a singlet FN field. Constraints on the model are derived from the study of K and D mixing and the Higgs search at the LHC. For last, the implications from the latter aforementioned constraints to the FCNC top decay $t\to ch$ are presented too.

10 pages, 3 figures and 2 tables; v2: author added, text improved; v3: Title and Abstract slightly changed, 19 pages, references, tables and images added, additional clarifications; matches version published by Nucl. Phys. B

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• A low-scale flavon model with a $Z_N$ symmetry
• Searching for LFV Flavon decays at hadron colliders
• Flavour bounds on the flavon of a minimal and a non-minimal ${\mathcal{Z}}_2\times {\mathcal{Z}}_N$ symmetry
• Light-quarks Yukawa couplings and new physics in exclusive high-$p_T$ Higgs + jet and Higgs + $b$-jet events
• Has a Higgs-flavon with a $750$ GeV mass been detected at the LHC13?
• Hidden Signals of New Physics within the Yukawa Couplings of the Higgs boson
• Symmetries for the 4HDM: extensions of cyclic groups
• Finding flavons at colliders
• The problem of flavour
• A lepton model with nearly Cobimaximal mixing
• A Private SUSY 4HDM with FCNC in the Up-sector