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Has the Origin of the Third-Family Fermion Masses been Determined?
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Precision measurements of the Higgs couplings are, for the first time, directly probing the mechanism of fermion mass generation. The purpose of this work is to determine to what extent these measurements can distinguish between the tree-level mechanism of the Standard Model and the theoretically motivated alternative of radiative mass generation. Focusing on the third-family, we classify the minimal one-loop models and find that they fall into two general classes. By exploring several benchmark models in detail, we demonstrate that a radiative origin for the tau-lepton and bottom-quark masses is consistent with current observations. While future colliders will not be able to rule out a radiative origin, they can probe interesting regions of parameter space.
Forward citations
Cited by 4 Pith papers
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Radiative Mass Generation in Gauged Theories of Flavour: A Path to Fermion Mass Hierarchies
Fermion mass hierarchies can arise because only the third generation gets tree-level mass, with first and second generation masses generated by gauge-boson loops in specific UV-complete models.
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Classification of minimal models producing b, c and tau masses at one-loop level
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