# Sequentially loop-generated quark and lepton mass hierarchies in an extended Inert Higgs Doublet model

## TL;DR

This paper presents a renormalisable extension of the Inert Higgs Doublet model that sequentially generates quark and lepton mass hierarchies through radiative corrections, also addressing recent flavor anomalies.

## Contribution

It introduces a novel model that explains fermion mass hierarchies and flavor anomalies using a fully renormalisable framework with specific family symmetries.

## Key findings

- Top quark mass generated at tree level
- Lighter fermions acquire masses at one- and two-loop levels
- Neutrino masses generated at three-loop level

## Abstract

Extended scalar and fermion sectors offer new opportunities for generating the observed strong hierarchies in the fermion mass and mixing patterns of the Standard Model (SM). In this work, we elaborate on the prospects of a particular extension of the Inert Higgs doublet model where the SM hierarchies are generated sequentially by radiative virtual corrections in a fully renormalisable way, i.e. without adding any non-renormalisable Yukawa terms or soft-breaking operators to the scalar potential. Our model has a potential to explain the recently observed $R_{K}$ and $R_{K^{\ast }}$ anomalies, thanks to the non universal $U_{1X}$ assignments of the fermionic fields that yield non universal $Z^{\prime}$ couplings to fermions. We explicitly demonstrate the power of this model for generating the realistic quark, lepton and neutrino mass spectra. In particular, we show that due to the presence of both continuous and discrete family symmetries in the considered framework, the top quark acquires a tree-level mass, lighter quarks and leptons get their masses at one- and two-loop order, while neutrino masses are generated at three-loop level. The minimal field content, particle spectra and scalar potential of this model are discussed in detail.