Abstract
We perform a comprehensive analysis of the most distinctive and important phenomenological implications of the recently proposed mechanism of sequential loop generation of strong hierarchies in the Standard Model (SM) fermion mass spectra. This mechanism is consistently realized at the level of renormalizable interactions in an extended variant of the Inert Higgs Doublet model, possessing the additional Z_{2}^{(1)}times Z_{2}^{(2)} discrete and U_{1X} gauge family symmetries, while the matter sectors of the SM are extended by means of SU_{2L}-singlet scalars, heavy vector-like leptons and quarks, as well as right-handed neutrinos. We thoroughly analyze the most stringent constraints on the model parameter space, coming from the Z^{prime } collider searches, related to the anomaly in lepton universality, and the muon anomalous magnetic moment, as well as provide benchmark points for further tests of the model and discuss possible “standard candle” signatures relevant for future explorations.
Highlights
Additional states are required to explain specific patterns in the Standard Model (SM) fermion spectra
We have studied some phenomenological aspects of the extended Inert Higgs Doublet model, which incorporates the mechanism of sequential loop-generation of the SM fermion masses, explaining the observed strong hierarchies between them as well as the corresponding mixing parameters
A particular emphasis has been made on analyzing the constraints on the Z mass and couplings of our model, imposed by the 2.6σ anomaly in lepton universality, the LEP constraint on the MZ /gX ratio and the constraints arising from the experimental measurements of the muon anomalous magnetic moment
Summary
Additional states are required to explain specific patterns in the SM fermion spectra. [16] we have proposed such a possible candidate theory, capable of generating the SM fermion mass and mixing hierarchies via a sequential loop suppression mechanism, in terms of model parameters with no intrinsically imposed hierarchies between them. We have found specific conditions on the minimal symmetry and particle content for a theory where this mechanism can be realized without adding the non-renormalizable (higherdimensional) Yukawa operators or soft family-breaking mass terms While such a construction is supposedly not unique, its minimality is manifest as every field plays a relevant role for producing the observed patterns in quark, lepton and neutrino sectors of the SM, with a required degree of suppression between the corresponding SM parameters
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