Vector-like Quarks at the Origin of Light Quark Masses and Mixing

Abstract

We show how a novel fine-tuning problem present in the Standard Model can be solved through the introduction of a single flavour symmetry G, together with three $Q=-1/3$ quarks, three $Q=2/3$ quarks, as well as a complex singlet scalar. The symmetry G is extended to the additional fields and it is an exact symmetry of the Lagrangian, only spontaneously broken by the vacuum. Specific examples are given and a phenomenological analysis of the main features of the model is presented. It is shown that even for vector-like quarks with masses accessible at the LHC, one can have realistic quark masses and mixing, while respecting the strict constraints on process arising from flavour changing neutral currents (FCNC). The vector-like quark decay channels are also described.

25 pages, no figures

References in corpus (14)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Big-Bang Nucleosynthesis
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Updated Values of Running Quark and Lepton Masses
• Patterns of Flavour Violation in Models with Vector-Like Quarks
• Survey of vector-like fermion extensions of the Standard Model and their phenomenological implications
• Bounds and Decays of New Heavy Vector-like Top Partners
• Search for vector-like T quarks decaying to top quarks and Higgs bosons in the all-hadronic channel using jet substructure
• Unification of Gauge Couplings in the Standard Model with Extra Vector-like Families
• Small violations of unitarity, the phase in Bs mixing and visible t->cZ decays at the LHC
• Nondecoupling of a terascale isosinglet quark and rare K and B decays
• New (virtual) Physics in the Era of the LHC
• Experimental Status of the CKM Matrix

Cited by in corpus (15)

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• A universally enhanced light-quarks Yukawa couplings paradigm
• Search for single production of vector-like top partners at the Large Hadron Electron Collider
• Asymmetry in flavour changing electromagnetic transitions of vector-like quarks
• Solving the fermionic mass hierarchy of the standard model
• Search for pair production of the heavy vectorlike top partner in same-sign dilepton signature at the HL-LHC
• Decays of the Heavy Top and New Insights on ${\epsilon }_K$ in a one-VLQ Minimal Solution to the CKM Unitarity Problem
• Natural Alignment of Quark Flavors and Radiatively Induced Quark Mixings
• New signals for vector-like down-type quark in $U(1)$ of $E_6$
• Search for single vector-like $B$ quark production in hadronic final states at the LHC
• Discovering the Origin of Yukawa Couplings at the LHC with a Singlet Higgs and Vector-like Quarks
• Vector-like quark doublets, weak-basis invariants and CP violation
• Solving a Fine-Tuning Problem of the Standard Model through the Introduction of Vector-Like Quarks
• Do the Small Numbers in the Quark Mixing arise from New Physics?